Table of Contents

1 IS-IS Configuration Commands· 1-1

IS-IS Configuration Commands· 1-1

area-authentication-mode· 1-1

auto-cost enable· 1-2

bandwidth-reference (IS-IS view) 1-3

circuit-cost 1-3

cost-style· 1-4

default-route-advertise (IS-IS view) 1-5

display isis brief 1-6

display isis debug-switches· 1-7

display isis graceful-restart status· 1-8

display isis interface· 1-9

display isis license· 1-12

display isis lsdb· 1-14

display isis mesh-group· 1-16

display isis name-table· 1-17

display isis peer 1-18

display isis route· 1-21

display isis spf-log· 1-23

display isis statistics· 1-25

domain-authentication-mode· 1-26

filter-policy export (IS-IS view) 1-27

filter-policy import (IS-IS view) 1-28

flash-flood· 1-29

graceful-restart (IS-IS view) 1-30

graceful-restart interval (IS-IS view) 1-30

graceful-restart suppress-sa· 1-31

import-route (IS-IS view) 1-32

import-route isis level-2 into level-1· 1-33

import-route limit (IS-IS view) 1-34

isis· 1-35

isis authentication-mode· 1-35

isis circuit-level 1-36

isis circuit-type p2p· 1-37

isis cost 1-38

isis dis-name· 1-39

isis dis-priority· 1-40

isis enable· 1-41

isis mesh-group· 1-41

isis silent 1-42

isis small-hello· 1-43

isis timer csnp· 1-44

isis timer hello· 1-45

isis timer holding-multiplier 1-45

isis timer lsp· 1-46

isis timer retransmit 1-47

is-level 1-48

is-name· 1-49

is-name map· 1-50

is-snmp-traps enable· 1-50

log-peer-change (IS-IS view) 1-51

lsp-fragments-extend· 1-51

lsp-length originate· 1-52

lsp-length receive· 1-53

maximum load-balancing (IS-IS view) 1-54

network-entity· 1-54

preference (IS-IS view) 1-55

reset isis all 1-56

reset isis peer 1-56

set-overload· 1-57

summary (IS-IS view) 1-58

timer lsp-generation· 1-59

timer lsp-max-age· 1-60

timer lsp-refresh· 1-61

timer spf 1-61

virtual-system·· 1-63

 

 

 

IS-IS Configuration Commands

area-authentication-mode

Syntax

area-authentication-mode { simple | md5 } password [ ip | osi ]

undo area-authentication-mode

View

IS-IS view

Default Level

2: System level

Parameters

simple: Specifies the simple authentication mode.

md5: Specifies the MD5 authentication mode.

password: Password. For simple authentication mode, the password must be plain text. For md5 authentication mode, the password can be either plain text or cipher text. A plaintext password can be a string of up to 16 characters, such as user918. A cipher password must be a ciphertext string of 24 characters, such as (TT8F]Y\5SQ=^Q`MAF4<1!!.

ip: Checks IP related fields in LSPs.

osi: Checks OSI related fields in LSPs.

 

 

Description

Use the area-authentication-mode command to specify the area authentication mode and a password.

Use the undo area-authentication-mode command to restore the default.

No area authentication is configured by default.

The password in the specified mode is inserted into all outgoing Level-1 packets (LSP, CSNP and PSNP) and is used for authenticating the incoming Level-1 packets.

With area authentication configured, IS-IS discards incoming routes from untrusted routers.

Note that:

l          Routers in a common area must have the same authentication mode and password.

l          If neither ip nor osi is specified, OSI related fields are checked.

Related commands: reset isis all, domain-authentication-mode, isis authentication-mode

Examples

# Set the area authentication password to ivg, and the authentication mode to simple.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] area-authentication-mode simple ivg

auto-cost enable

Syntax

auto-cost enable

undo auto-cost enable

View

IS-IS view

Default Level

2: System level

Parameters

None

Description

Use the auto-cost enable command to enable automatic link cost calculation.

Use the undo auto-cost enable command to disable the function.

This function is disabled by default.

After automatic link cost calculation is enabled, the link cost is automatically calculated based on the bandwidth reference value of an interface. When the cost-style is wide or wide-compatible, the cost value of an interface is calculated by using the formula: Cost = (reference bandwidth value/link bandwidth) × 10.

Related commands: bandwidth-reference, cost-style.

Examples

# Enable automatic link cost calculation.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] auto-cost enable

bandwidth-reference (IS-IS view)

Syntax

bandwidth-reference value

undo bandwidth-reference

View

IS-IS view

Default Level

2: System level

Parameters

value: Bandwidth reference value in Mbps, ranging from 1 to 2147483648.

Description

Use the bandwidth-reference command to set the bandwidth reference value for automatic link cost calculation.

Use the undo bandwidth-reference command to restore the default.

By default, the bandwidth reference value is 100 Mbps.

Related commands: auto-cost enable.

Examples

# Configure the bandwidth reference of IS-IS process 1 as 200 Mbps.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] bandwidth-reference 200

circuit-cost

Syntax

circuit-cost value [ level-1 | level-2 ]

undo circuit-cost [ level-1 | level-2 ]

View

IS-IS view

Default Level

2: System level

Parameters

value: Link cost value. The value range varies with cost styles.

l          For styles narrow, narrow-compatible and compatible, the cost value ranges from 0 to 63.

l          For styles wide and wide-compatible, the cost value ranges from 0 to 16777215.

level-1: Applies the link cost to Level-1.

level-2: Applies the link cost to Level-2.

Description

Use the circuit-cost command to set a global IS-IS link cost.

Use the undo circuit-cost command to restore the default.

By default, no global link cost is configured.

If no level is specified, the specified cost applies to both Level-1 and Level-2.

Related commands: isis cost, cost-style.

Examples

# Set the global Level-1 link cost of IS-IS process 1 to 11.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] circuit-cost 11 level-1

cost-style

Syntax

cost-style { narrow | wide | wide-compatible | { compatible | narrow-compatible } [ relax-spf-limit ] }

undo cost-style

View

IS-IS view

Default Level

2: System level

Parameters

narrow: Receives and sends only narrow cost style packets (The narrow cost ranges from 0 to 63).

wide: Receives and sends only wide cost style packets (The wide cost ranges from 0 to 16777215).

compatible: Receives and sends both wide and narrow cost style packets.

narrow-compatible: Receives both narrow and wide cost style packets, but sends only narrow cost style packets.

wide-compatible: Receives both narrow and wide cost style packets, but sends only wide cost style packets.

relax-spf-limit: Allows receiving routes with a cost greater than 1023. If this keyword is not specified, any route with a cost bigger than 1023 will be discarded. This keyword is only available when compatible or narrow-compatible is included.

Description

Use the cost-style command to set a cost style.

Use the undo cost-style command to restore the default.

Only narrow cost style packets can be received and sent by default.

Related commands: isis cost, circuit-cost.

Examples

# Configure the router to send only narrow cost style packets, but receive both narrow and wide cost style packets.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] cost-style narrow-compatible

default-route-advertise (IS-IS view)

Syntax

default-route-advertise [ route-policy route-policy-name | [ level-1 | level-2 | level-1-2 ] ] *

undo default-route-advertise [ route-policy route-policy-name ]

View

IS-IS view

Default Level

2: System level

Parameters

route-policy-name: Specifies the name of a routing policy, a string of 1 to 19 characters.

level-1: Advertises a Level-1 default route.

level-2: Advertises a Level-2 default route.

level-1-2: Advertises both Level-1 and Level-2 default routes.

Description

Use the default-route-advertise command to advertise a default route of 0.0.0.0/0.

Use the undo default-route-advertise command to disable default route advertisement.

Default route advertisement is disabled by default.

Note that:

l          If no level is specified, a Level-2 default route is advertised.

l          The Level-1 default route is advertised to other routers in the same area, while the Level-2 default route is advertised to all the Level-2 and Level-1-2 routers.

l          Using the apply isis level-1 command in routing policy view will generate a default route in a Level-1 LSP. Using the apply isis level-2 command in routing policy view will generate a default route in a Level-2 LSP. Using the apply isis level-1-2 command in routing policy view will generate a default route in a Level-1 LSP and Level-2 LSP respectively.

Examples

# Advertise a Level-2 default route.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] default-route-advertise

display isis brief

Syntax

display isis brief [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

process-id: Displays IS-IS brief configuration information for the IS-IS process. The process ID is in the range 1 to 65535.

vpn-instance vpn-instance-name: Displays IS-IS brief configuration information for the VPN instance. The VPN instance name is a string of 1 to 31 characters.

Description

Use the display isis brief command to view IS-IS brief configuration information.

Examples

# Display IS-IS brief configuration information.

<Sysname> display isis brief

 

                  ISIS (1) Protocol Brief Information :

 

 

 network-entity:

     10.0000.0000.0001.00

 is-level :level-1-2

 cost-style:  narrow

 preference :  15

 Lsp-length receive :  1497

 Lsp-length originate :  level-1 1497

                         level-2 1497

maximum imported routes number     : 10000

 Timers:

     lsp-max-age:  1200

     lsp-refresh:  900

     Interval between SPFs:  10

Table 1-1  display isis brief command output description

 

display isis debug-switches

Syntax

display isis debug-switches { process-id | vpn-instance vpn-instance-name }

View

Any view

Default Level

1: Monitor level

Parameters

process-id: Displays the IS-IS debugging switch state for the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the IS-IS debugging switch state for the VPN instance. The name is a string of 1 to 31 characters.

Description

Use the display isis debug-switches command to display IS-IS debugging switch state.

Examples

# Display the debugging switch state of IS-IS process 1.

<Sysname> display isis debug-switches 1

IS-IS - Debug settings.

        IS-IS SPF Triggering Events debugging is on

display isis graceful-restart status

Syntax

display isis graceful-restart status [ level-1 | level-2 ] [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

level-1: Displays the IS-IS Level-1 Graceful Restart state.

level-2: Displays the IS-IS Level-2 Graceful Restart state.

process-id: IS-IS Process ID, in the range 1 to 65535.

vpn-instance vpn-instance-name: Name of a VPN instance, a string of 1 to 31 characters.

Description

Use the display isis graceful-restart status command to display IS-IS Graceful Restart status.

Examples

# Display IS-IS Graceful Restart status.

<Sysname> display isis graceful-restart status

                Restart information for IS-IS(1)

--------------------------------------------------------------------

IS-IS(1) Level-1 Restart Status

Restart Interval: 150

SA Bit Supported

  Total Number of Interfaces = 1

  Restart Status: RESTARTING

  Number of LSPs Awaited: 3

  T3 Timer Status:

    Remaining Time: 140

  T2 Timer Status:

    Remaining Time: 59

 

IS-IS(1) Level-2 Restart Status

Restart Interval: 150

SA Bit Supported

  Total Number of Interfaces = 1

  Restart Status: RESTARTING

  Number of LSPs Awaited: 3

  T3 Timer Status:

    Remaining Time: 140

  T2 Timer Status:

Remaining Time: 59

Table 1-2 display isis graceful-restart status command output description

 

display isis interface

Syntax

display isis interface [ statistics | [ interface-type interface-number ] [ verbose ] ] [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

statistics: Displays IS-IS interface statistics information.

interface-type interface-number: IS-IS interface whose statistics information is to be displayed.

verbose: Displays detailed IS-IS interface information.

process-id: Displays the IS-IS interface information of the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the IS-IS interface information of the VPN instance. The name is a string of 1 to 31 characters.

Description

Use the display isis interface command to display IS-IS interface information.

Examples

# Display brief IS-IS interface information.

<Sysname> display isis interface

                       Interface information for ISIS(1)

                       ---------------------------------

Interface: Vlan-interface1

Id      IPV4.State        IPV6.State     MTU    Type    DIS

001       Up                 Down       1497    L1/L2   No/No

# Display detailed IS-IS interface information.

<Sysname> display isis interface verbose

 

                       Interface information for ISIS(1)

                       ---------------------------------

 

  Interface:  Vlan-interface999

  Id      IPV4.State           IPV6.State        MTU  Type  DIS

  001          Up                  Down          1497 L1/L2 No/No

  SNPA Address                : 000f-e237-c6e0

  IP Address                  : 192.168.1.48

  Secondary IP Address(es)    :

  IPV6 Link Local Address     :

  IPV6 Global Address(es)     :

  Csnp Timer Value            :  L1    10  L2    10

  Hello Timer Value           :  L1    10  L2    10

  Hello Multiplier Value      :  L1     3  L2     3

  Lsp Timer Value             :  L12   33

  Cost                        :  L1    10  L2    10

  Priority                    :  L1    64  L2    64

  Retransmit Timer Value      :  L12    5

  BFD                         :  Disabled

  MPLS TE Status              :  OFF

  INTF L1 TE Status           :  OFF

  INTF L2 TE Status           :  OFF

  TE Cost                     :  0

  TE Admin Group              :  0

  TE Max Bandwidth            :  0

  TE Max Res Bandwidth        :  0

# Displays detailed information of the specified IS-IS interface.

<Sysname> display isis interface Tunnel 1 verbose

 

                       Interface information for ISIS(1)

                       ---------------------------------

 

  Interface:  Tunnel1

  Id      IPv4.State           IPv6.State        MTU  Type  DIS

  005          Up                  Down          16384L1/L2 --

  SNPA Address                : 0000-0000-0000

  IP Address                  : 10.1.1.4

  Secondary IP Address(es)    :

  IPv6 Link Local Address     :

  IPv6 Global Address(es)     :

  Csnp Timer Value            :  L1    10  L2    10

  Hello Timer Value           :        10

  Hello Multiplier Value      :         3

  Cost                        :  L1    10  L2    10

  Priority                    :  L1    64  L2    64

  Retransmit Timer Value      :  L12    5

  Retransmit-Throttle Timer   :  L12   33

  BFD                         :  Disabled

  Tunnel L1 State             :  OFF

  Tunnel L2 State             :  ON

  Tunnel Type                 :  AA

  Tunnel Metric               :  0

  Destination Router ID       :  5.5.5.5

Table 1-3  display isis interface command output description

 

# Display IS-IS interface statistics information.

<sysname> display isis interface statistics

                  Interface Statistics information for ISIS(1)

                  --------------------------------------------

  Type            IPv4 Up/Down           IPv6 Up/Down

  LAN                   0/1                   -/-

  P2P                   4/0                   -/-

Table 1-4 display isis interface statistics command output description

 

display isis license

Syntax

display isis license

View

Any view

Default Level

1: Monitor level

Parameters

None

Description

Use the display isis license command to display the information of the IS-IS license.

Examples

# Display the information of the IS-IS license.

<Sysname> display isis license

 

                       ISIS Shell License Values

                       _________________________

 

 Feature Name         Active     Controllable

 ISIS Protocol        YES        NO

 IPV6                 YES        NO

 RESTART              YES        NO

 TE                   NO        NO

 MI                   YES        NO

 

 Resource Name             MinVal     MaxVal     CurrVal    Controllable

 Max Processes Resource    1          1024       500        0

 Max Paths Resource        1          6          3          0

 Max IPv4 Rt Resource      400000     400000     400000     0

 Max IPv6 Rt Resource      400000     400000     400000     0

 

                       ISIS Core License Values

                       ________________________

 

 Feature Name         Active

 ISIS Protocol        YES

 IPV6                 YES

 RESTART              YES

 TE                   NO

 MI                   YES

 

 Resource Name             Current Value

 Max Processes Resource    500

 Max Paths Resource        3

 Max IPv4 Rt Resource      400000

 Max IPv6 Rt Resource      400000

Table 1-5  display isis license command output description

 

display isis lsdb

Syntax

display isis lsdb [ [ l1 | l2 | level-1 | level-2 ] | [ lsp-id LSPID | lsp-name lspname ] | local | verbose ] * [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

l1, level-1: Displays the level-1 LSDB.

l2, level-2: Displays the level-2 LSDB.

LSPID: LSP ID, in the form of sysID. Pseudo ID-fragment num, where sysID represents the originating node or pseudo node.

lspname: LSP name, in the form of Symbolic name.[Pseudo ID]-fragment num.

local: Displays LSP information generated locally.

verbose: Displays LSDB detailed information.

process-id: Displays the LSDB of the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the LSDB of the VPN instance. The VPN instance name is a string of 1 to 31 characters.

Description

Use the display isis lsdb command to display IS-IS link state database.

If no level is specified, both Level-1 and Level-2 link state databases are displayed.

Examples

# Display brief Level-1 LSDB information.

<Sysname> display isis lsdb level-1

 

                          Level-1 Link State Database

 

LSPID                 Seq Num      Checksum      Holdtime      Length  ATT/P/OL

--------------------------------------------------------------------------

 

1111.1111.1111.00-00  0x00000004   0xa76         563           68      0/0/0

1111.1111.1112.00-00* 0x00000006   0x498d        578           84      0/0/0

1111.1111.1112.01-00* 0x00000001   0x4c0e        556           55      0/0/0

 

*-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload

# Display detailed Level-1 LSDB information.

<Sysname> display isis lsdb level-1 verbose

 

                        Database information for ISIS(1)

                        --------------------------------

 

                          Level-1 Link State Database

 

LSPID                 Seq Num      Checksum      Holdtime      Length  ATT/P/OL

--------------------------------------------------------------------------

 

1111.1111.1111.00-00  0x00000005   0x877         1090          68      0/0/0

 SOURCE       1111.1111.1111.00

 NLPID        IPV4

 AREA ADDR    10

 INTF ADDR    3.1.1.2

 NBR  ID      1111.1111.1112.01  COST: 10

 IP-Internal  3.1.1.0        255.255.255.0    COST: 10

 

1111.1111.1112.00-00* 0x00000007   0x478e        1120          84      0/0/0

 SOURCE       1111.1111.1112.00

 NLPID        IPV4

 AREA ADDR    10

 INTF ADDR    3.1.1.1

 INTF ADDR    2.1.2.2

 NBR  ID      1111.1111.1112.01  COST: 10

 IP-Internal  3.1.1.0        255.255.255.0    COST: 10

 IP-Internal  2.1.2.0        255.255.255.0    COST: 10

 

1111.1111.1112.01-00* 0x00000002   0x4a0f        1118          55      0/0/0

 SOURCE       1111.1111.1112.01

 NLPID        IPV4

 NBR  ID      1111.1111.1112.00  COST: 0

 NBR  ID      1111.1111.1111.00  COST: 0

 

    *-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload

Table 1-6 display isis lsdb command output description

 

display isis mesh-group

Syntax

display isis mesh-group [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

process-id: Displays IS-IS mesh-group configuration information for the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays IS-IS mesh-group configuration information for the VPN instance. The VPN instance name is a string of 1 to 31 characters.

Description

Use the display isis mesh-group command to display IS-IS mesh-group configuration information.

Examples

# Configure VLAN-interface 10 and VLAN-interface 20 to belong to mesh-group 100.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis mesh-group 100

[Sysname-Vlan-interface10] interface vlan-interface 20

[Sysname-Vlan-interface20] isis mesh-group 100

# Display the configuration information of IS-IS mesh-group.

[Sysname-Vlan-interface20] display isis mesh-group

 

                       Mesh Group information for ISIS(1)

                       ----------------------------------

 Interface          Status

 Vlan10              100

 Vlan20              100

Table 1-7 display isis mesh-group command output description

 

display isis name-table

Syntax

display isis name-table [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

process-id: Displays the host name-to-system ID mapping table for the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the host name-to-system ID mapping table for the VPN instance. The VPN instance name is a string of 1 to 31 characters.

Description

Use the display isis name-table command to display the host name-to-system ID mapping table.

Examples

# Configure a name for the local IS system.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] is-name RUTA

# Configure a static mapping for the remote IS system (system ID 0000.0000.0041, host name RUTB).

[Sysname-isis-1] is-name map 0000.0000.0041 RUTB

# Display the IS-IS host name-to-system ID mapping table.

[Sysname-isis-1] display isis name-table

              Name table information for ISIS(1)

---------------------------------------------------------------

System ID            Hostname                            Type

6789.0000.0001       RUTA                                DYNAMIC

0000.0000.0041       RUTB                                STATIC

Table 1-8 display isis name-table command output description

 

display isis peer

Syntax

display isis peer [ verbose | statistics ] [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

verbose: Displays detailed IS-IS neighbor information. Without the keyword, the command displays brief IS-IS neighbor information.

statistics: Displays IS-IS neighbor statistics information.

process-id: Displays the IS-IS neighbor information of the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the IS-IS neighbor information of the VPN instance. The vpn-instance-name is a string of 1 to 31 characters.

Description

Use the display isis peer command to display IS-IS neighbor information.

Examples

# Display brief IS-IS neighbor information.

<Sysname> display isis peer

 

                          Peer information for ISIS(1)

                          ----------------------------

 

  System Id: 1111.1111.1111

  Interface: Vlan-interface1           Circuit Id: 1111.1111.1112.01

  State: Up     HoldTime: 23s        Type: L1(L1L2)     PRI: 64

 

  System Id: 1111.1111.1111

  Interface: Vlan-interface1           Circuit Id: 1111.1111.1112.01

  State: Up     HoldTime: 23s        Type: L2(L1L2)     PRI: 64

# Display detailed IS-IS neighbor information.

<Sysname>display isis peer verbose

 

                          Peer information for ISIS(1)

                          ----------------------------

 

  System Id: 1111.1111.1111

  Interface: Vlan-interface1           Circuit Id: 1111.1111.1112.01

  State: Up     HoldTime: 27s        Type: L1(L1L2)     PRI: 64

  Area Address(es):10

  Peer IP Address(es): 3.1.1.2

  Uptime: 00:38:15

  Adj Protocol:  IPV4

 

 

  System Id: 1111.1111.1111

  Interface: Vlan-interface1           Circuit Id: 1111.1111.1112.01

  State: Up     HoldTime: 28s        Type: L2(L1L2)     PRI: 64

  Area Address(es):10

  Peer IP Address(es): 3.1.1.2

  Uptime: 00:38:15

  Adj Protocol:  IPV4

Table 1-9 display isis peer command output description

 

# Display IS-IS neighbor statistics information.

<Sysname> display isis peer statistics

 

                    Peer Statistics information for ISIS(1)

                    ---------------------------------------

  Type              IPv4 Up/Init             IPv6 Up/Init

  LAN Level-1             0/0                      0/0

  LAN Level-2             0/0                      0/0

  P2P                     3/0                      0/0

Table 1-10 display isis peer statistics command output description

 

display isis route

Syntax

display isis route [ ipv4 ] [ [ level-1 | level-2 ] | verbose ] * [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

ipv4: Displays IS-IS IPv4 routing information (the default).

verbose: Displays detailed IS-IS IPv4 routing information.

process-id: Displays the IS-IS IPv4 routing information of the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays the IS-IS IPv4 routing information of the VPN instance. The vpn-instance-name is a string of 1 to 31 characters.

level-1: Displays Level-1 IS-IS routes.

level-2: Displays Level-2 IS-IS routes.

Description

Use the display isis route command to display IS-IS IPv4 routing information.

If no level is specified, both Level-1 and Level-2  routing information will be displayed.

Examples

# Display IS-IS IPv4 routing information.

<Sysname> display isis route 1

 

                         Route information for ISIS(1)

                         -----------------------------

 

                     ISIS(1) IPv4 Level-1 Forwarding Table

                     -------------------------------------

 

 IPV4 Destination     IntCost    ExtCost ExitInterface   NextHop         Flags

--------------------------------------------------------------------------

 1.1.0.0/16           20         NULL    Vlan1        1.2.1.1         R/L/-

 1.2.0.0/16           10         NULL    Vlan1        Direct          D/L/-

 

      Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set

 

 

                     ISIS(1) IPv4 Level-2 Forwarding Table

                     -------------------------------------

 

 IPV4 Destination     IntCost    ExtCost ExitInterface   NextHop         Flags

--------------------------------------------------------------------------

 1.1.0.0/16           20         NULL

 1.2.0.0/16            10         NULL    Vlan1        Direct          D/L/-

 

      Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set

Table 1-11 display isis route command output description

 

# Display detailed IS-IS IPv4 routing information.

<Sysname>display isis route verbose

                         Route information for ISIS(1)

                         -----------------------------

 

                     ISIS(1) IPv4 Level-1 Forwarding Table

                     -------------------------------------

 

 IPV4 Dest  : 1.1.0.0/16         Int. Cost : 20              Ext. Cost : NULL

 Admin Tag  : -                  Src Count : 2               Flag      : R/L/-

 NextHop    :                    Interface :                 ExitIndex :

    1.2.1.1                            Vlan1                   0x00000008

 

 IPV4 Dest  : 1.2.0.0/16         Int. Cost : 10              Ext. Cost : NULL

 Admin Tag  : -                  Src Count : 2               Flag      : D/L/-

 NextHop    :                    Interface :                 ExitIndex :

    Direct                             Vlan1                   0x00000000

 

      Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set

 

 

                     ISIS(1) IPv4 Level-2 Forwarding Table

                     -------------------------------------

 

 IPV4 Dest  : 1.1.0.0/16         Int. Cost : 20              Ext. Cost : NULL

 Admin Tag  : -                  Src Count : 2               Flag      : -/-/-

 

 IPV4 Dest  : 1.2.0.0/16         Int. Cost : 10              Ext. Cost : NULL

 Admin Tag  : -                  Src Count : 3               Flag      : D/L/-

 NextHop    :                    Interface :                 ExitIndex :

    Direct                             Vlan1                   0x00000000

 

      Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set

Table 1-12 display isis route verbose command output description

 

display isis spf-log

Syntax

display isis spf-log [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

process-id: Displays IS-IS SPF log information for the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays IS-IS SPF log information for the VPN instance. The name is a string of 1 to 31 characters.

Description

Use the display isis spf-log command to display IS-IS SPF log information.

Examples

# Display IS-IS SPF log information.

<Sysname> display isis spf-log

                        SPF Log information for ISIS(1)

                        -------------------------------

   Level    Trig.Event                      No.Nodes  Duration   StartTime

   L2       IS_SPFTRIG_PERIODIC             2         0          13:3:24

   L1       IS_SPFTRIG_PERIODIC             2         0          13:18:8

   L2       IS_SPFTRIG_PERIODIC             2         0          13:18:8

   L1       IS_SPFTRIG_PERIODIC             2         0          13:32:28

   L2       IS_SPFTRIG_PERIODIC             2         0          13:32:28

   L1       IS_SPFTRIG_PERIODIC             2         0          13:44:0

   L2       IS_SPFTRIG_PERIODIC             2         0          13:44:0

   L1       IS_SPFTRIG_PERIODIC             2         0          13:55:43

-->L2       IS_SPFTRIG_PERIODIC             2         0          13:55:43

   L1       IS_SPFTRIG_PERIODIC             2         0          11:54:12

   L2       IS_SPFTRIG_PERIODIC             2         0          11:54:12

   L1       IS_SPFTRIG_PERIODIC             2         0          12:7:24

   L2       IS_SPFTRIG_PERIODIC             2         0          12:7:24

   L1       IS_SPFTRIG_PERIODIC             2         0          12:21:24

   L2       IS_SPFTRIG_PERIODIC             2         0          12:21:24

   L1       IS_SPFTRIG_PERIODIC             2         0          12:35:24

   L2       IS_SPFTRIG_PERIODIC             2         0          12:35:24

   L1       IS_SPFTRIG_PERIODIC             2         0          12:49:24

   L2       IS_SPFTRIG_PERIODIC             2         0          12:49:24

   L1       IS_SPFTRIG_PERIODIC             2         0          13:3:24

Table 1-13 display isis spf-log command output description

 

display isis statistics

Syntax

display isis statistics [ level-1 | level-2 | level-1-2 ] [ process-id | vpn-instance vpn-instance-name ]

View

Any view

Default Level

1: Monitor level

Parameters

level-1: Displays IS-IS Level-1 statistics.

level-2: Displays IS-IS Level-2 statistics.

level-1-2: Displays IS-IS Level-1-2 statistics.

process-id: Displays IS-IS statistics for the IS-IS process. The ID is in the range of 1 to 65535.

vpn-instance-name: Displays IS-IS statistics for the VPN instance. The name is a string of 1 to 31 characters.

Description

Use the display isis statistics command to display IS-IS statistics.

Examples

# Display IS-IS statistics.

<Sysname> display isis statistics

 

                       Statistics information for ISIS(1)

                       ----------------------------------

 

                               Level-1 Statistics

                               ------------------

 

Learnt routes information:

         Total IPv4 Learnt Routes in IPv4 Routing Table: 1

         Total IPv6 Learnt Routes in IPv6 Routing Table: 0

 

Imported routes information:

         IPv4 Imported Routes:

                         Static: 0       Direct: 0

                         ISIS:   0       BGP:    0

                         RIP:    0       OSPF:   0

         IPv6 Imported Routes:

                         Static: 0       Direct: 0

                         ISISv6: 0       BGP4+:  0

                         RIPng:  0       OSPFv3: 0

 

Lsp information:

                  LSP Source ID:          No. of used LSPs

                  0000.0000.0003                  002

Table 1-14  display isis statistics command output description

 

domain-authentication-mode

Syntax

domain-authentication-mode { simple | md5 } password [ ip | osi ]

undo domain-authentication-mode

View

IS-IS view

Default Level

2: System level

Parameters

simple: Specifies the simple authentication mode.

md5: Specifies the MD5 authentication mode.

password: Specifies a password. For simple authentication mode, the password must be plain text. For md5 authentication mode, the password can be either plain text or cipher text. A plain text password can be a string of up to 16 characters, such as user918. A cipher password must be a string of 24 characters, such as _(TT8F]Y\5SQ=^Q`MAF4<1!!.

ip: Checks IP related fields in LSPs.

osi: Checks OSI related fields in LSPs.

 

 

Description

Use the domain-authentication-mode command to specify the routing domain authentication mode and a password.

Use the undo domain-authentication-mode command to restore the default.

No routing domain authentication is configured by default

The configured password in the specified mode is inserted into all outgoing Level-2 packets (LSP, CSNP and PSNP) and is used for authenticating the incoming Level-2 packets.

Note that:

l          All the backbone routers must have the same authentication mode and password.

l          If neither ip nor osi is specified, the OSI related fields in LSPs are checked.

Related commands: area-authentication-mode, isis authentication-mode.

Examples

# Specify the routing domain authentication mode as simple and password as 123456.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] domain-authentication-mode simple 123456

filter-policy export (IS-IS view)

Syntax

filter-policy { acl-number | ip-prefix ip-prefix-name | route-policy route-policy-name } export [ protocol [ process-id ] ]

undo filter-policy export [ protocol [ process-id ] ]

View

IS-IS view

Default Level

2: System level

Parameters

acl-number: Specifies the number of an ACL that is used to filter redistributed routes, ranging from 2000 to 3999. For ACL configuration information, refer to ACL commands in the Security Volume.

ip-prefix ip-prefix-name: Specifies the name of an IP prefix list that is used to filter redistributed routes, a string of 1 to 19 characters. For IP prefix list configuration information, refer to Routing Policy commands in the IP Routing Volume.

route-policy route-policy-name: Specifies the name of a routing policy that is used to filter redistributed routes, a string of 1 to 19 characters. For routing policy configuration information, refer to Routing Policy commands in the IP Routing Volume.

protocol: Filters routes redistributed from the routing protocol, which can be BGP, direct, IS-IS, OSPF, RIP or static.

process-id: Process ID, in the range of 1 to 65535. It is optional only when the protocol is IS-IS, OSPF or RIP.

Description

Use the filter-policy export command to configure IS-IS to filter redistributed routes.

Use the undo filter-policy export command to disable IS-IS from filtering redistributed routes.

IS-IS does not filter redistributed routes by default.

Related commands: filter-policy import.

Examples

# Reference ACL 2000 to filter redistributed routes.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] filter-policy 2000 export

filter-policy import (IS-IS view)

Syntax

filter-policy { acl-number | ip-prefix ip-prefix-name | route-policy route-policy-name } import

undo filter-policy import

View

IS-IS view

Default Level

2: System level

Parameters

acl-number: Specifies the number of an ACL that is used to filter routes calculated from received LSPs, ranging from 2000 to 3999. For ACL configuration information, refer to ACL commands in the Security Volume.

ip-prefix ip-prefix-name: Specifies the name of an IP prefix list that is used to filter routes calculated from received LSPs, a string of 1 to 19 characters. For IP prefix list configuration information, refer to Routing Policy commands in the IP Routing Volume.

route-policy route-policy-name: Specifies the name of a routing policy that is used to filter routes calculated from received LSPs, a string of 1 to 19 characters. For routing policy configuration information, refer to Routing Policy commands in the IP Routing Volume.

Description

Use the filter-policy import command to configure IS-IS to filter routes calculated from received LSPs.

Use the undo filter-policy import command to disable IS-IS from filtering routes calculated from received LSPs.

IS-IS does not filter routes calculated from received LSPs by default.

Related commands: filter-policy export.

Examples

# Reference ACL 2000 to filter routes calculated from received LSPs.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] filter-policy 2000 import

flash-flood

Syntax

flash-flood [ flood-count flooding-count | max-timer-interval flooding-interval | [ level-1 | level-2 ] ] *

undo flash-flood [ level-1 | level-2 ]

View

IS-IS view

Default Level

2: System level

Parameters

flood-count flooding-count: Specifies the maximum number of LSPs to be flooded before the next SPF calculation, ranging from 1 to 15. The default is 5.

max-timer-interval flooding-interval: Specifies the delay (in milliseconds) of the flash flooding, ranging from 10 to 50000. The default is 10.

level-1: Enables flash flooding for level-1.

level-2: Enables fast-flooding for level-2.

Description

Use the flash-flood command to enable IS-IS LSP flash flooding.

Use the undo flash-flood command to disable IS-IS LSP flash flooding.

IS-IS LSP flash flooding is disabled by default.

If no level is specified, the command enables IS-IS LSP flash flooding for both Level-1 and Level-2.

Examples

# Enable fast flooding and configure the maximum LSPs be sent as 10 and the delay time as 100 milliseconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] flash-flood flood-count 10 max-timer-interval 100

graceful-restart (IS-IS view)

Syntax

graceful-restart

undo graceful-restart

View

IS-IS view

Default Level

2: System level

Parameters

None

Description

Use the graceful-restart command to enable IS-IS Graceful Restart capability.

Use the undo graceful-restart command to disable IS-IS Graceful Restart capability.

By default, IS-IS Graceful Restart capability is disabled.

Examples

# Enable the Graceful Restart capability for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] graceful-restart

graceful-restart interval (IS-IS view)

Syntax

graceful-restart interval interval-value

undo graceful-restart interval

View

IS-IS view

Default Level

2: System level

Parameters

interval-value: Graceful Restart interval, in the range 30 to 1800 seconds.

Description

Use the graceful-restart interval command to configure the Graceful Restart interval.

Use the undo graceful-restart interval command to restore the default Graceful Restart interval.

By default, the Graceful Restart interval is 300 seconds.

Examples

# Configure the Graceful Restart interval for IS-IS process 1 as 120 seconds.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] graceful-restart interval 120

graceful-restart suppress-sa

Syntax

graceful-restart suppress-sa

undo graceful-restart suppress-sa

View

IS-IS view

Default Level

2: System level

Parameters

None

Description

Use the graceful-restart suppress-sa command to suppress the SA (Suppress-Advertisement) bit during restart.

Use the undo graceful-restart suppress-sa command to set the SA bit. 

By default, the SA bit is set during restart.

Suppressing the SA bit is mainly for avoiding black hole route. If a router starts or reboots without keeping the local forwarding table, sending packets to the router may result in a severe packet loss. To avoid this, you can set the SA bit of the hello packet sent by the GR Restarter to 1. Upon receiving such hello packets, the GR Helpers will not advertise the GR Restarter through LSP.

Examples

# Suppress the SA bit during Graceful Restart.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] graceful-restart suppress-sa

import-route (IS-IS view)

Syntax

import-route protocol [ process-id | all-processes | allow-ibgp ] [ cost cost | cost-type { external | internal } | [ level-1 | level-1-2 | level-2 ] | route-policy route-policy-name | tag tag ] *

undo import-route protocol [ process-id | all-processes ]

View

IS-IS view

Default Level

2: System level

Parameters

protocol: Redistributes routes from a routing protocol, which can be BGP, direct, IS-IS, OSPF, RIP or static.

process-id: Process ID, in the range of 1 to 65535. It is available only when the protocol is IS-IS, OSPF or RIP.

all-processes: Redistributes routes from all the processes of the specified routing protocol. This keyword takes effect only when the protocol is rip, ospf, or isis.

allow-ibgp: Allows redistribution of IBGP routes. It is available when the protocol is BGP.

cost: Specifies a cost for redistributed routes.

The range of the cost depends on its style:

l          For the styles of narrow, narrow-compatible and compatible, the cost ranges from 0 to 63.

l          For the styles of wide, wide-compatible, the cost ranges from 0 to 16777215.

cost-type { external | internal }: Specifies the cost type. The internal type indicates internal routes, and the external type indicates external routes. If external is specified, the cost of a redistributed route to be advertised is added by 64 to make internal routes take priority over external routes. The type is external by default. The keywords are available only when the cost type is narrow, narrow-compatible or compatible.

level-1: Redistributes routes into the Level-1 routing table.

level-2: Redistributes routes into the Level-2 routing table. If no level is specified, the routes are redistributed into the Level-2 routing table by default.

level-1-2: Redistributes routes into both Level-1 and Level-2 routing tables.

route-policy route-policy-name: Redistributes only routes satisfying the matching conditions of a routing policy, the name of which is a string of 1 to 19 characters.

tag tag: Specifies a tag value for redistributed routes from 1 to 4294967295.

Description

Use the import-route command to redistribute routes from another routing protocol or another IS-IS process.

Use the undo import-route command to disable route redistribution from another routing protocol or another IS-IS process.

No route redistribution is configured by default.

IS-IS takes all the redistributed routes as external routes to destinations outside the IS-IS routing domain.

Related commands: import-route isis level-2 into level-1.

 

 

Examples

# Redistribute static routes and set the cost to 15.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] import-route static cost 15

import-route isis level-2 into level-1

Syntax

import-route isis level-2 into level-1 [ filter-policy { acl-number | ip-prefix ip-prefix-name | route-policy route-policy-name } | tag tag ] *

undo import-route isis level-2 into level-1

View

IS-IS view

Default Level

2: System level

Parameters

acl-number: Specifies the number of an ACL that is used to filter routes from Level-2 to Level-1, ranging from 2000 to 3999. For ACL configuration information, refer to ACL commands in the Security Volume.

ip-prefix ip-prefix-name: Specifies the name of an IP prefix list that is used to filter routes from Level-2 to Level-1, a string of 1 to 19 characters. For IP prefix list configuration information, refer to Routing Policy commands in the IP Routing Volume.

route-policy route-policy-name: Specifies the name of a routing policy that is used to filter routes from Level-2 to Level-1, a string of 1 to 19 characters. For routing policy configuration information, refer to Routing Policy commands in the IP Routing Volume.

tag tag: Specifies a tag value from 1 to 4294967295 for redistributed routes.

Description

Use the import-route isis level-2 into level-1 command to enable route leaking from Level-2 to Level-1.

Use the undo import-route isis level-2 into level-1 command to disable routing leaking.

No route leaking is configured by default.

Note that:

l          You can specify a routing policy in the import-route isis level-2 into level-1 command to filter routes from Level-2 to Level-1. Other routing policies specified for route reception and redistribution does not affect the route leaking.

l          If a filter policy is configured, only routes passing it can be advertised into the Level-1 area.

Related commands: import-route.

Examples

# Enable route leaking from Level-2 to Level-1.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] import-route isis level-2 into level-1

import-route limit (IS-IS view)

Syntax

import-route limit number

undo import-route limit

View

IS-IS view

Default Level

2: System level

Parameters

number: Maximum number of redistributed Level 1/Level 2 IPv4 routes, in the range 1 to 128000.

Description

Use the import-route limit command to configure the maximum number of redistributed Level 1/Level 2 IPv4 routes.

Use the undo import-route limit command to restore the default.

By default, the maximum number of redistributed Level 1/Level 2 IPv4 routes is 128000.

Examples

# Configure IS-IS process 1 to redistribute up to 1000 Level 1/Level 2 IPv4 routes.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] import-route limit 1000

isis

Syntax

isis [ process-id ] [ vpn-instance vpn-instance-name ]

undo isis [ process-id ]

View

System view

Default Level

2: System level

Parameters

process-id: Process ID, ranging from 1 to 65535. The default is 1.

vpn-instance-name: VPN instance name, a string of 1 to 31 characters.

Description

Use the isis command to enable an IS-IS process and specify an associated VPN instance and/or enter IS-IS view.

Use the undo isis command to disable an IS-IS process.

Related commands: isis enable, network-entity.

Examples

# Enable IS-IS routing process 1, with the system ID being 0000.0000.0002, and area ID being 01.0001.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] network-entity 01.0001.0000.0000.0002.00

isis authentication-mode

Syntax

isis authentication-mode { simple | md5 } password [ level-1 | level-2 ] [ ip | osi ]

undo isis authentication-mode [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

simple: Specifies the simple authentication mode.

md5: Specifies the MD5 authentication mode.

password: Specifies a password. For simple authentication mode, the password must be plain text. For md5 authentication mode, the password can be either plain text or ciphertext. A plain text password can be a string of up to 16 characters, such as user918. A cipher password must be a string of 24 characters, such as _(TT8F]Y\5SQ=^Q`MAF4<1!!.

level-1: Sets the password for Level-1.

level-2: Sets the password for Level-2.

ip: Checks IP related fields in LSPs and SNPs.

osi: Checks OSI related fields in LSPs and SNPs.

 

 

Description

Use the isis authentication-mode command to set the IS-IS authentication mode and password for an interface.

Use the undo isis authentication-mode command to restore the default.

No neighbor relationship authentication is configured by default.

The password in the specified mode is inserted into all outgoing hello packets and is used for authenticating the incoming hello packets. Only the authentication succeeds can the neighbor relationship be formed.

Note that:

l          For two routers to become neighbors, the same authentication mode and password must be specified at both ends.

l          If you set a password without specifying a level, the password applies to both Level-1 and Level-2,

l          If neither ip nor osi is specified, the OSI related fields in LSPs are checked.

l          The level-1 and level-2 keywords are available only on the VLAN interfaces of switches after IS-IS is enabled on the interfaces with the isis enable command.

Related commands: area-authentication-mode, domain authentication-mode.

Examples

# Set the plain text password tangshi for VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis authentication-mode simple tangshi level-1

isis circuit-level

Syntax

isis circuit-level [ level-1 | level-1-2 | level-2 ]

undo isis circuit-level

View

Interface view

Default Level

2: System level

Parameters

level-1: Sets the circuit level to Level-1.

level-1-2: Sets the circuit level to Level-1-2.

level-2: Sets the circuit level to Level-2.

Description

Use the isis circuit-level command to set the circuit level for the interface.

Use the undo isis circuit-level command to restore the default.

An interface can establish either the Level-1 or Level-2 adjacency by default.

Note that:

For a Level-1 (Level-2) router, the circuit level can only be Level-1 (Level-2). For a Level-1-2 router, you need to specify a circuit level for a specific interface to form only the specified level neighbor relationship.

Related commands: is-level.

Examples

# VLAN-interface 10 is connected to a non backbone router in the same area. Configure the circuit level of VLAN-interface 10 as Level-1 to prevent sending and receiving Level-2 Hello packets.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis enable

[Sysname-Vlan-interface10] isis circuit-level level-1

isis circuit-type p2p

Syntax

isis circuit-type p2p

undo isis circuit-type

View

Interface view

Default Level

2: System level

Parameters

None

Description

Use the isis circuit-type p2p command to configure the network type for an interface as P2P.

Use the undo isis circuit-type command to cancel the configuration.

By default, the network type of a switch’s VLAN interface is broadcast.

Interfaces with different network types operate differently. For example, broadcast interfaces on a network need to elect a DIS and flood CSNP packets to synchronize the LSDBs, while P2P interfaces on a network need not elect a DIS and have a different LSDP synchronization mechanism.

If there are only two routers on a broadcast network, you can configure the network type of attached interfaces as P2P to avoid DIS election and CSNP flooding, saving network bandwidth and speeding up network convergence.

 

 

Examples

# Configure the network type of VLAN-interface 10 as P2P.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis enable

[Sysname-Vlan-interface10] isis circuit-type p2p

isis cost

Syntax

isis cost value [ level-1 | level-2 ]

undo isis cost [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

value: Specifies an IS-IS cost for the interface. The cost range differs with cost styles.

l          For cost styles narrow, narrow-compatible and compatible, the cost ranges from 1 to 63.

l          For cost styles wide and wide-compatible, the cost ranges from 1 to 16777215.

level-1: Applies the cost to Level-1.

level-2: Applies the cost to Level-2.

Description

Use the isis cost command to set the IS-IS cost of an interface.

Use the undo isis cost command to restore the default.

No cost is configured by default.

If neither level-1 nor level-2 is included, the cost applies to both level-1 and level-2.

You are recommended to configure a proper IS-IS cost for each interface to guarantee correct route calculation.

Relate command: circuit-cost.

Examples

# Configure the Level-2 IS-IS cost as 5 for VLAN-interface10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis cost 5 level-2

isis dis-name

Syntax

isis dis-name symbolic-name

undo isis dis-name

View

Interface view

Default Level

2: System level

Parameters

symbolic-name: Specifies a DIS name, a string of 1 to 64 characters.

Description

Use the isis dis-name command to configure a name for a DIS to represent the pseudo node on a broadcast network.

Use the undo isis dis-name command to remove the configuration.

No name is configured for the DIS by default.

Note that this command takes effect only on a router that must have dynamic system ID to host name mapping enabled. This command is not supported on a Point-to-Point interface.

 

 

Examples

# Configure the DIS name as LOCALAREA.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis dis-name LOCALAREA

isis dis-priority

Syntax

isis dis-priority value [ level-1 | level-2 ]

undo isis dis-priority [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

value: Specifies a DIS priority for the interface, ranging from 0 to 127.

level-1: Applies the DIS priority to Level-1.

level-2: Applies the DIS priority to level-2.

Description

Use the isis dis-priority command to specify a DIS priority at a specified level for an interface.

Use the undo isis dis-priority command to restore the default priority of 64 for Level-1 and Level-2.

If neither level-1 nor level-2 is specified in this command, the DIS priority applies to both Level-1 and Level-2.

On an IS-IS broadcast network, a router should be elected as the DIS at each routing level. You can specify a DIS priority at a level for an interface. The greater the interface’s priority is, the more likelihood it becomes the DIS. If multiple routers in the broadcast network have the same highest DIS priority, the router with the highest SNPA (Subnetwork Point of Attachment) address (SNPA addresses are MAC addresses on a broadcast network) becomes the DIS.

There is no backup DIS in IS-IS and the router with a priority of 0 can also participate in DIS election.

 

 

Examples

# Configure the level-2 DIS priority as 127 for VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis dis-priority 127 level-2

isis enable

Syntax

isis enable [ process-id ]

undo isis enable

View

Interface view

Default Level

2: System level

Parameters

process-id: Specifies a IS-IS process ID, ranging from 1 to 65535. The default is 1.

Description

Use the isis enable command to enable an IS-IS process on the interface.

Use the undo isis enable command to disable IS-IS.

No IS-IS routing process is enabled on an interface by default.

Related commands: isis, network-entity.

Examples

# Create IS-IS routing process 1, and enable the IS-IS routing process on VLAN-interface 10.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] network-entity 10.0001.1010.1020.1030.00

[Sysname-isis-1] quit

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis enable 1

isis mesh-group

Syntax

isis mesh-group { mesh-group-number | mesh-blocked }

undo isis mesh-group

View

Interface view

Default Level

2: System level

Parameters

mesh-group-number: Mesh group number, ranging from 1 to 4294967295.

mesh-blocked: Blocks the interface, which sends LSPs only after receiving LSP requests.

Description

Use the isis mesh-group command to add the interface into a specified mesh group or block the interface.

Use the undo isis mesh-group command to restore the default.

By default, an interface does not belong to any mesh group.

For an interface not in a mesh group, it follows the normal process to flood the received LSPs to other interfaces. For the NBMA network with high connectivity and multiple point-to-point links, this will cause repeated LSP flooding and bandwidth waste.

After an interface is added to a mesh group, it will only flood a received LSP or a generated LSP to interfaces not belonging to the same mesh group.

If you block an interface, the interface can send LSPs only after receiving LSP requests.

 

 

Examples

# Add IS-IS enabled VLAN-interface 10 to the mesh-group 3.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis mesh-group 3

isis silent

Syntax

isis silent

undo isis silent

View

Interface view

Default Level

2: System level

Parameters

None

Description

Use the isis silent command to disable the interface from sending and receiving IS-IS packets.

Use the undo isis silent command to restore the default.

By default, an interface is not disabled from sending and receiving IS-IS packets.

 

 

Examples

# Disable VLAN-interface 10 from sending and receiving IS-IS packets.

<Sysname> system-view

[Sysname] interface vlan-interface10

[Sysname-Vlan-interface10] isis silent

isis small-hello

Syntax

isis small-hello

undo isis small-hello

View

Interface view

Default Level

2: System level

Parameters

None

Description

Use the isis small-hello command to configure the interface to send small hello packets without CLVs.

Use the undo isis small-hello command to restore the default.

An interface sends standard hello packets by default.

 

 

Examples

# Configure VLAN-interface 10 to send small Hello packets.

<Sysname> system-view

[Sysname] interface vlan-interface10

[Sysname-Vlan-interface10] isis small-hello

isis timer csnp

Syntax

isis timer csnp seconds [ level-1 | level-2 ]

undo isis timer csnp [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

seconds: Specifies on the DIS of a broadcast network the interval in seconds for sending CSNP packets, ranging from 1 to 600.

level-1: Applies the interval to Level-1.

level-2: Applies the interval to Level-2.

Description

Use the isis timer csnp command to specify on the DIS of a broadcast network the interval for sending CSNP packets.

Use the undo isis timer csnp command to restore the default.

The default CSNP interval is 10 seconds.

 

 

Examples

# Configure Level-2 CSNP packets to be sent every 15 seconds over VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis timer csnp 15 level-2

isis timer hello

Syntax

isis timer hello seconds [ level-1 | level-2 ]

undo isis timer hello [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

seconds: Specifies the interval in seconds for sending hello packets, ranging from 3 to 255.

level-1: Specifies the interval for sending Level-1 hello packets.

level-2: Specifies the interval for sending Level-2 hello packets.

Description

Use the isis timer hello command to specify the interval for sending hello packets.

Use the undo isis timer hello command to restore the default.

The default hello interval is 10 seconds.

 

 

Related commands: isis timer holding-multiplier.

Examples

# Configure Level-2 Hello packets to be sent every 20 seconds over VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis timer hello 20 level-2

isis timer holding-multiplier

Syntax

isis timer holding-multiplier value [ level-1 | level-2 ]

undo isis timer holding-multiplier [ level-1 | level-2 ]

View

Interface view

Default Level

2: System level

Parameters

value: Number of hello intervals, in the range of 3 to 1000.

level-1: Applies the number to the Level-1 IS-IS neighbor.

level-2: Applies the number to the Level-2 IS-IS neighbor.

 

 

Description

Use the isis timer holding-multiplier command to specify the IS-IS hello multiplier.

Use the undo isis timer holding-multiplier command to restore the default.

The default IS-IS hello multiplier is 3.

If no level is specified, the hello multiplier applies to the current level.

With the IS-IS hello multiplier configured, a router can uses hello packets to notify its neighbor router of the adjacency hold time (hello multiplier times hello interval). If the neighbor router receives no hello packets from this router within the hold time, it declares the adjacency down. You can adjust the adjacency hold time by changing the hello multiplier or the hello interval on an interface.

Level-1 and Level-2 hello packets are sent independently on a broadcast network, so you need to specify a hello multiplier for the two levels respectively. On a P2P link, Level-1 and Level-2 packets are both sent in P2P hello packets, and you need not specify Level-1 or Level-2.

Related commands: isis timer hello.

Examples

# Configure the number of Level-2 Hello intervals as 6 for interface VLAN-interface, that is, if no Hello packet is received from the interface within 6 hello intervals, the IS-IS neighbor is considered dead.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis timer holding-multiplier 6

isis timer lsp

Syntax

isis timer lsp time [ count count ]

undo isis timer lsp

View

Interface view

Default Level

2: System level

Parameters

time: Specifies the minimum interval in milliseconds for sending link-state packets, ranging from 1 to 1000.

count: Specifies the maximum number of link-state packets to be sent at one time, in the range of 1 to 1000. The default is 5.

Description

Use the isis timer lsp command to configure the minimum interval for sending LSPs on the interface and specify the maximum LSPs that can be sent per time.

Use the undo isis timer lsp command to restore the default of 33ms.

Related commands: isis timer retransmit.

 

 

Examples

# Configure the interval as 500 milliseconds for sending LSPs on interface VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis timer lsp 500

isis timer retransmit

Syntax

isis timer retransmit seconds

undo isis timer retransmit

View

Interface view

Default Level

2: System level

Parameters

seconds: Specifies the interval in seconds for retransmitting LSP packets, ranging from 1 to 300.

Description

Use the isis timer retransmit command to configure the interval for retransmitting LSP packets over a point-to-point link.

Use the undo isis timer retransmit command to restore the default.

By default, the retransmission interval is 5 seconds.

A P2P link requires a response to a sent LSP. If no response is received within the retransmission interval, the LSP is retransmitted.

You need not use this command over a broadcast link where CNSPs are broadcast periodically.

Related commands: isis timer lsp.

 

 

Examples

# Configure the LSP retransmission interval as 10 seconds for VLAN-interface 10.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] isis timer retransmit 10

is-level

Syntax

is-level { level-1 | level-1-2 | level-2 }

undo is-level

View

IS-IS view

Default Level

2: System level

Parameters

level-1: Configures the router to work on Level-1, which means it only calculates routes within the area, and maintains the L1 LSDB.

level-1-2: Configures the router to work on Level-1-2, which means it calculates routes and maintains the LSDBs for both L1 and L2.

level-2: Configures the router to work on Level-2, which means it calculates routes and maintains the LSDB for L2 only.

Description

Use the is-level command to specify the IS level.

Use the undo is-level command to restore the default.

The default IS level is level-1-2.

You can configure all the routers as either Level-1 or Level-2 if there is only one area, because there is no need for all routers to maintain two identical databases at the same time. If the only area is an IP network, you are recommended to configure all the routers as Level-2 for scalability.

Related commands: isis circuit-level.

Examples

# Configure the router to work in Level-1.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] is-level level-1

is-name

Syntax

is-name sys-name

undo is-name

View

IS-IS view

Default Level

2: System level

Parameters

symbolic-name: Specifies a host name for the local IS, a string of 1 to 64 characters.

Description

Use the is-name command to specify a host name for the IS to enable dynamic system ID to hostname mapping.

Use the undo is-name command to disable dynamic system ID to hostname mapping.

Dynamic system ID to hostname mapping is not enabled by default.

Examples

# Configure a host name for the local IS.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] is-name RUTA

is-name map

Syntax

is-name map sys-id map-sys-name

undo is-name map sys-id

View

IS-IS view

Default Level

2: System level

Parameters

sys-id: System ID or pseudonode ID of a remote IS.

map-sys-name: Specifies a host name for the remote IS, a string of 1 to 64 characters.

Description

Use the is-name map command to configure a system ID to host name mapping for a remote IS.

Use the undo is-name map command to remove the mapping.

Each remote IS system ID corresponds to only one name.

Examples

# Map the host name RUTB to the system ID 0000.0000.0041 of the remote IS.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] is-name map 0000.0000.0041 RUTB

is-snmp-traps enable

Syntax

is-snmp-traps enable

undo is-snmp-traps

View

IS-IS view

Default Level

2: System level

Parameters

None

Description

Use the is-snmp-traps enable command to enable the SNMP Trap function of IS-IS.

Use the undo is-snmp-traps command to disable this function.

SNMP Trap is enabled by default.

Examples

# Enable SNMP Trap.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] is-snmp-traps enable

log-peer-change (IS-IS view)

Syntax

log-peer-change

undo log-peer-change

View

IS-IS view

Default Level

2: System level

Parameters

None

Description

Use the log-peer-change command to enable the logging of IS-IS neighbor state changes.

Use the undo log-peer-change command to disable the logging.

The logging is enabled by default.

After the logging is enabled, information about IS-IS adjacency state changes is sent to the configuration terminal.

Examples

# Enable logging on the IS-IS adjacency state changes.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] log-peer-change

lsp-fragments-extend

Syntax

lsp-fragments-extend [ [ level-1 | level-2 | level-1-2 ] | [ mode-1 | mode-2 ] ] *

undo lsp-fragments-extend

View

IS-IS view

Default Level

2: System level

Parameters

mode-1: Fragment extension mode 1, used on a network where some routers do not support LSP fragment extension.

mode-2: Fragment extension mode 2, used on a network where all routers support LSP fragment extension.

level-1: Applies the fragment extension mode to Level-1 LSPs.

level-2: Applies the fragment extension mode to Level-2 LSPs.

level-1-2: Applies the fragment extension mode to both Level-1 and Level-2 LSPs.

Description

Use the lsp-fragments–extend command to enable an LSP fragment extension mode for a level.

Use the undo lsp-fragments–extend command to disable LSP fragment extension for a level.

LSP fragment extension is disabled by default.

Note that:

l          If no mode is specified, LSP fragment extension mode 1 is enabled.

l          If no level is specified, the LSP fragment extension mode is enabled for both Level-1 and Level-2.

Examples

# Enable LSP fragment extension mode 1 for Level-2.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] lsp-fragments-extend mode-1 level-2

lsp-length originate

Syntax

lsp-length originate size [ level-1 | level-2 ]

undo lsp-length originate [ level-1 | level-2 ]

View

IS-IS view

Default Level

2: System level

Parameters

size: Specifies the maximum size in bytes of LSP packets, ranging from 512 to 16384.

level-1: Applies the size to Level-1 LSP packets.

level-2: Applies the size to Level-2 LSP packets.

Description

Use the lsp-length originate command to configure the maximum size of generated Level-1 or Level-2 LSPs.

Use the undo lsp-length originate command to restore the default.

By default, the maximum size of generated Level-1 and Level-2 LSPs is 1497 bytes.

 

 

Examples

# Configure the maximum size of the generated Level-2 LSPs as 1024 bytes.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] lsp-length originate 1024 level-2

lsp-length receive

Syntax

lsp-length receive size

undo lsp-length receive

View

IS-IS view

Default Level

2: System level

Parameters

size: Maximum size of received LSPs, in the range of 512 to 16384 bytes.

Description

Use the lsp-length receive command to configure the maximum size of received LSPs.

Use the undo lsp-length receive command to restore the default.

By default, the maximum size of received LSPs is 1497 bytes.

Examples

# Configure the maximum size of received LSPs.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] lsp-length receive 1024

maximum load-balancing (IS-IS view)

Syntax

maximum load-balancing number

undo maximum load-balancing

View

IS-IS view

Default Level

2: System level

Parameters

number: Maximum number of equal-cost routes for load balancing, in the range 1 to 4..

Description

Use the maximum load-balancing command to configure the maximum number of equal-cost routes for load balancing.

Use the undo maximum load-balancing command to restore the default.

By default, the maximum number of equal-cost load balanced routes is 4.

Examples

# Configure the maximum number of equal-cost load-balanced routes as 2.

<Sysname> system-view

[Sysname] isis 100

[Sysname-isis-100] maximum load-balancing 2

# Restore the default.

[Sysname-isis-100] undo maximum load-balancing

network-entity

Syntax

network-entity net

undo network-entity net

View

IS-IS view

Default Level

2: System level

Parameters

net: Network Entity Title (NET) in the format of X…X.XXXX....XXXX.00, with the first part X…X being the area address, the middle part XXXX....XXXX (a total of 12 “X”) being the router’s system ID and the last part 00 being SEL.

Description

Use the network-entity command to configure the Network Entity Title for an IS-IS routing process.

Use the undo network-entity command to delete a NET.

No NET is configured by default.

Related commands: isis, isis enable.

Examples

# Specify the NET as 10.0001.1010.1020.1030.00, of which 10.0001 is the area ID and 1010.1020.1030 is the system ID.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] network-entity 10.0001.1010.1020.1030.00

preference (IS-IS view)

Syntax

preference { route-policy route-policy-name | preference } *

undo preference

View

IS-IS view

Default Level

2: System level

Parameters

preference: Specifies the preference for IS-IS protocol, ranging from 1 to 255.

route-policy route-policy-name: Routing policy name, a string of 1 to 19 characters. The preference applies to routes passing the routing policy.

Description

Use the preference command to configure the preference for IS-IS.

Use the undo preference command to restore the default.

By default, IS-IS preference is 15.

If a routing policy is specified in this command, the preference (if any) set by the routing policy applies to those matched routes. Other routes use the preference set by the preference command.

When a router runs multiple routing protocols at the same time, the system will configure a preference to each routing protocol. If several protocols find routes to the same destination, the route of the routing protocol with the highest preference is selected.

Examples

# Configure the preference of IS-IS protocol as 25.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] preference 25

reset isis all

Syntax

reset isis all [ process-id | vpn-instance vpn-instance-name ]

View

User view

Default Level

3: Manage level

Parameters

process-id: Clears the data structure information of an IS-IS process numbered from 1 to 65535.

vpn-instance-name: Clears the data structure information of a VPN instance named with a string of 1 to 31 characters.

Description

Use the reset isis all command to clear all IS-IS data structure information.

No data structure information is cleared by default.

This command is used when the LSP needs to be updated immediately. For example, after performing the area-authentication-mode and domain-authentication-mode commands, you can use this command to clear old LSPs.

Related commands: area-authentication-mode, domain authentication-mode.

Examples

# Clear all IS-IS data structure information.

<Sysname> reset isis all

reset isis peer

Syntax

reset isis peer system-id [ process-id | vpn-instance vpn-instance-name ]

View

User view

Default Level

3: Manage level

Parameters

system-id: Specifies the system ID of an IS-IS neighbor.

process-id: Clears the data structure information of an IS-IS process with an ID from 1 to 65535.

vpn-instance-name: Clears the data structure information of a VPN instance named with a string of 1 to 31 characters.

Description

Use the reset isis peer command to clear the data structure information of a specified IS-IS neighbor.

This command is used when you need to re-establish an IS-IS neighbor relationship.

Examples

# Clear the data structure information of the neighbor with the system ID 0000.0c11.1111.

<Sysname> reset isis peer 0000.0c11.1111

set-overload

Syntax

set-overload [ on-startup [ [ start-from-nbr system-id [ timeout1 [ nbr-timeout ] ] ] | timeout2 ] [ allow { interlevel | external } * ]

undo set-overload

View

IS-IS view

Default Level

2: System level

Parameters

on-startup: Sets the overload bit upon system startup.

start-from-nbr system-id: Starts the nbr-timeout timer when the router begins to establish the neighbor relationship with the neighbor. If the neighbor relationship is formed within the nbr-timeout interval, IS-IS keeps the overload bit set; if not, the bit is cleared. system-id specifies the neighbor.

timeout1: IS-IS keeps the overload bit set within the timeout1 interval after the neighbor relationship is formed within the nbr-timeout interval. The timeout1 interval is in the range 5 to 86400 seconds and defaults to 600 seconds.

nbr-timeout: The timer is started when the router begins to establish the neighbor relationship with the neighbor after system startup. The timer has an interval from 5 to 86400 seconds. The default is 1200 seconds.

timeout2: Sets the overload bit within the timeout2 interval after system startup. The interval is in the range 5 to 86400 seconds and defaults to 600 seconds.

allow: Allows advertising address prefixes. By default, no address prefixes are allowed to be advertised when the overload bit is set.

interlevel: Allows advertising IP address prefixes learnt from different IS-IS levels with the allow keyword specified.

external: Allows advertising IP address prefixes redistributed from other routing protocols with the allow keyword specified.

Description

Use the set-overload command to set the overload bit.

Use the undo set-overload command to clear the overload bit.

The overload bit is not set by default.

Note that:

l          If the on-startup keyword is not specified, the command sets the overload bit immediately until the undo set-overload command is executed.

l          If the on-startup keyword is specified, IS-IS sets the overload bit upon system startup and keeps it set within the timeout2 interval.

l          If both on-startup and start-from-nbr system-id are specified, IS-IS sets the overload bit from system startup to when the neighbor relationship with the specified neighbor is formed within the nbr-timeout interval, and from then on, IS-IS keeps the overload bit set within the timeout1 interval. If the neighbor relationship with the specified neighbor is not formed within the nbr-timeout interval, the overload bit is cleared.

Examples

# Set overload flag on the current router.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] set-overload

summary (IS-IS view)

Syntax

summary ip-address { mask | mask-length } [ avoid-feedback | generate_null0_route | [ level-1 | level-1-2 | level-2 ] | tag tag ] *

undo summary ip-address { mask | mask-length } [ level-1 | level-1-2 | level-2 ]

View

IS-IS view

Default Level

2: System level

Parameters

ip-address: Destination IP address of the summary route.

mask: Mask of the destination IP address, in dotted decimal format.

mask-length: Mask length, in the range of 0 to 32.

avoid-feedback: Avoids learning summary routes by route calculation.

generate_null0_route: Generate the Null 0 route to avoid routing loops.

level-1: Summarize only the routes redistributed to Level-1.

level-1-2: Summarizes the routes redistributed to both Level-1 and Level-2.

level-2: Summarizes only the routes redistributed to Level-2.

tag tag: Specifies a management tag, in the range of 1 to 4294967295.

Description

Use the summary command to configure a summary route.

Use the undo summary command to remove a summary route.

No summarization is configured by default.

If no level is specified, only the level-2 routes will be summarized by default.

You can summarize multiple contiguous networks into a single network to reduce the size of the routing table, as well as that of LSP and LSDB generated by the router. It is allowed to summarize native IS-IS routes and redistributed routes. After summarization, the cost of the summary route is the smallest cost of those summarized routes.

Note that the router summarizes only routes in local LSPs.

Examples

# Configure a summary route of 202.0.0.0/8.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] summary 202.0.0.0 255.0.0.0

timer lsp-generation

Syntax

timer lsp-generation maximum-interval [ initial-interval [ second-wait-interval ] ] [ level-1 | level-2 ]

undo timer lsp-generation [ level-1 | level-2 ]

View

IS-IS view

Default Level

2: System level

Parameters

maximum-interval: Maximum wait interval in seconds for generating IS-IS LSPs, in the range 1 to 120.

initial-interval: Initial wait interval in milliseconds before generating the first IS-IS LSP, in the range 10 to 60000. The default is 0.

second-wait-interval: Wait interval in milliseconds before generating the second LSP, in the range 10 to 60000. The default is 0.

level-1: Applies the intervals to Level-1.

level-2: Applies the intervals to Level-2 .If no level is specified, the specified intervals apply to both Level-1 and Level-2.

Description

Use the timer lsp-generation command to specify the wait interval before generating IS-IS LSPs.

Use the undo timer lsp-generation command to restore the default.

By default, the wait interval before LSP generation is 2 seconds.

Note that:

1)        If only the maximum interval is specified, IS-IS waits the maximum interval before generating an LSP.

2)        If both the maximum and initial intervals are specified:

l          IS-IS waits the initial interval before generating the first LSP.

l          If the network topology is unstable, that is, triggers occur at intervals shorter than the maximum interval, IS-IS waits the maximum interval before generating the first LSP until the network topology is stable.

3)        If the maximum, initial, and second wait intervals are specified:

l          IS-IS waits the initial interval before generating the first LSP.

l          If the network topology is unstable, that is, triggers occur at intervals shorter than the maximum interval,, IS-IS waits the second-wait-interval before generating the second LSP and penalty is applied on the wait interval before generating the next LSP. That is, for each subsequent trigger, the wait interval before generating the LSP will be two times the previous wait interval until the maximum interval is reached.

l          After the network topology is stable; that is, triggers occur at intervals greater than the maximum interval, the wait interval before generating LSPs is restored to the initial interval.

Examples

# Set the maximum, initial, and second wait intervals to 10 seconds, 100 milliseconds and 200 milliseconds respectively.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1]timer lsp-generation 10 100 200

# Set the LSP generation interval to 15 seconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1]timer lsp-generation 15

timer lsp-max-age

Syntax

timer lsp-max-age seconds

undo timer lsp-max-age

View

IS-IS view

Default Level

2: System level

Parameters

seconds: Specifies the LSP maximum aging time in seconds, ranging from 1 to 65535.

Description

Use the timer lsp-max-age command to set the LSP maximum age in the LSDB.

Use the undo timer lsp-max-age command to restore the default.

The default LSP maximum age is 1200 seconds.

Related commands: timer lsp-refresh.

Examples

# Set the maximum LSP age to 1500 seconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] timer lsp-max-age 1500

timer lsp-refresh

Syntax

timer lsp-refresh seconds

undo timer lsp-refresh

View

IS-IS view

Default Level

2: System level

Parameters

seconds: LSP refresh interval in seconds, ranging from 1 to 65534.

Description

Use the timer lsp-refresh command to configure the LSP refresh interval.

Use the undo timer lsp-refresh to restore the default.

The default LSP refresh interval is 900 seconds.

Related commands: timer lsp-max-age.

 

 

Examples

# Configure the LSP refresh interval as 1500 seconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] timer lsp-refresh 1500

timer spf

Syntax

timer spf maximum-interval [initial-interval [second-interval ] ]

undo timer spf

View

IS-IS view

Default Level

2: System level

Parameters

maximum-interval: Maximum SPF calculation interval in seconds, ranging from 1 to 120.

initial-interval: Wait interval before the first SPF calculation, in milliseconds, ranging from 10 to 60000.

second-interval: Wait interval before the second SPF calculation, in milliseconds, ranging from 10 to 60000.

Description

Use the timer spf command to set the SPF calculation interval.

Use the undo timer spf command to restore the default.

The default IS-IS SPF calculation interval is 10 seconds.

Note that:

1)        If only the maximum interval is specified, IS-IS waits the maximum interval before performing the SPF calculation.

2)        If both the maximum and initial intervals are specified:

l          IS-IS waits the initial interval before performing the first SPF calculation.

l          When SPF calculation triggers occur at intervals shorter than the maximum interval, the topology is considered unstable and IS-IS waits the maximum interval before performing the SPF calculation unitl the topology is stable.

3)        If maximum-interval, initial-interval, and second-interval are specified:

l          IS-IS waits the initial interval before performing the first SPF calculation.

l          When SPF calculation triggers occur at intervals shorter than the maximum interval, the topology is considered unstable, IS-IS will wait the second-interval before performing the second SPF calculation and penalty is applied on the wait interval for the next SPF calculation. That is, for each subsequent trigger, the wait interval before SPF calculation will be two times the previous wait interval until the maximum interval is reached.

l          After the network topology becomes stable; that is, triggers occur at intervals greater than the maximum interval, the wait interval before SPF calculation is restored to the initial interval.

Examples

# Configure the maximum SPF calculation interval as 10 seconds, the wait interval before the first SPF calculation as 100 milliseconds, and the wait interval before the second SPF calculation as 200 milliseconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1]timer spf 10 100 200

# Configure the maximum SPF calculation interval as 15 seconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1]timer spf 15

virtual-system

Syntax

virtual-system virtual-system-id

undo virtual-system virtual-system-id

View

IS-IS view

Default Level

2: System level

Parameters

virtual-system-id: Virtual system ID of the IS-IS process.

Description

Use the virtual-system command to configure a virtual system ID for the IS-IS process. Use the undo virtual-system command to remove a virtual system ID.

Up to 50 virtual system IDs can be configured for the IS-IS process.

Examples

# Set a virtual system ID of 2222.2222.2222 for IS-IS process 1.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] virtual-system 2222.2222.2222