instance instance-name: Specifies a BGP instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify this option, the command displays information about the default BGP instance.

ipv4-address: Specifies the IPv4 address of an existing peer. If you do not specify this argument, the command displays information about all peers and peer groups.

Examples

# Display BGP EPE segment information.

<Sysname> display bgp egress-engineering ipv4

BGP peering segment type: Set

Nexthop : 192.168.1.2

Local AS number : 1

Remote AS number : 2

Local router ID : 1.1.1.3

Remote router ID : 1.1.1.4

OriginNextHop : 192.168.1.2

RelyNextHop : 192.168.1.2

Interface : GE1/0

Label : 24002

# Display BGP EPE segment information for a peer.

<Sysname> display bgp egress-engineering ipv4 192.168.1.2

BGP peering segment type: Node

Nexthop : 192.168.1.2

Local AS number : 1

Remote Asnumber : 2

Local router ID : 1.1.1.3

Remote router ID : 1.1.1.4

OriginNextHop : 192.168.1.2

RelyNextHop : 192.168.1.2

Label : 24002

# Display BGP EPE segment information for a peer.

<Sysname> display bgp egress-engineering ipv4 192.168.1.5

BGP peering segment type: Adjacency

NextHop : 192.168.1.5

Local AS number : 1

Remote AS number : 2

Local router ID : 1.1.1.3

Remote router ID : 1.1.1.5

OriginNextHop : 192.168.1.5

RelyNextHop : 192.168.1.5

Interface : GE5/0

Label : 24002

Table 1 Command output

Field	Description
Interface	Interface on which the neighborship is established.
OriginNextHop	Original next hop.
RelyNextHop	Recursive next hop.

display bgp segment-routing label-range

Use display bgp segment-routing label-range to display BGP SR label ranges.

Syntax

display bgp [ instance instance-name ] segment-routing label-range

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

Examples

# Display BGP SR label ranges.

<Sysname> display bgp segment-routing label-range

BGP peering segment labels:

24001-917503

Prefix labels:

16000-24000

display isis segment-routing adjacency

Use display isis segment-routing adjacency to display IS-IS SR adjacency segment information.

Syntax

display isis segment-routing adjacency [ process-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

process-id: Specifies an IS-IS process ID in the range of 1 to 65535. If you do not specify this argument, the command displays SR adjacency segment information about all IS-IS processes.

Examples

# Display SR adjacency segment information about IS-IS process 1.

<Sysname> display isis segment-routing adjacency 1

Segment routing adjacency path information for IS-IS(1)

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

SystemID Interface Nexthop Label Type

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

0000.0000.0011 GE1/0 10.123.110.21 24122 L1

0000.0000.0012 GE2/0 192.168.56.21 24121 L1

Table 2 Command output

Field	Description
SystemID	System ID of the neighbor.
Interface	Interface connected to the neighbor.
Nexthop	Next hop of the adjacency segment.
Label	Incoming label.
Type	Link adjacency type of the interface.

display isis segment-routing global-block

Use display isis segment-routing global-block to display IS-IS SRGB information.

Syntax

display isis segment-routing global-block [ level-1 | level-2 ] [ process-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

level-1: Specifies Level-1 SRGB.

level-2: Specifies Level-2 SRGB.

process-id: Specifies an IS-IS process ID in the range of 1 to 65535. If you do not specify this argument, the command displays the SRGBs of all IS-IS processes.

Usage guidelines

If you do not specify the level-1 or level-2 keyword, the command displays information about both the Level-1 SRGB and Level-2 SRGB.

Examples

# Display information about the SRGBs for IS-IS process 1.

<Sysname> display isis segment-routing global-block 1

Segment routing global block information for IS-IS(1)

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

Level-1 SRGB

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

System ID Base Range

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

0000.0000.0011 16666 5557

0000.0000.0012 18012 4001

Table 3 Command output

Field	Description
System ID	System ID of the neighbor.
Base	Minimum label value of the SRGB.
Range	Number of labels in the SRGB.

Related commands

segment-routing global-block

display isis segment-routing prefix-sid-map

Use display isis segment-routing prefix-sid-map to display IS-IS SR prefix-SID mappings.

Syntax

display isis segment-routing prefix-sid-map [ active-policy | backup-policy ] [ process-id ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

active-policy: Displays active prefix-SID mappings.

backup-policy: Displays backup prefix-SID mappings.

process-id: Specifies an IS-IS process ID in the range of 1 to 65535. If you do not specify this argument, the command displays information about all IS-IS processes.

verbose: Displays detailed information. If you do not specify this keyword, the command displays brief information.

Usage guidelines

If you do not specify the active-policy or backup-policy keyword, the command displays information about both active and backup prefix-SID mappings.

Examples

# Display active IS-IS SR prefix-SID mappings.

<Sysname> display isis segment-routing prefix-sid-map active-policy

ISIS 1 - Active policy

Number of mappings: 5

Prefix SID index Range Flags

2.2.2.2/32 10 10 -

3.3.3.3/32 300 1 -

8.8.8.8/32 600 20 -

11.11.11.11/32 100 10 -

12.12.12.1/32 44 3 -

# Display detailed information about active IS-IS SR prefix-SID mappings.

<Sysname> display isis segment-routing prefix-sid-map active-policy verbose

ISIS 1 - Active policy

Number of mappings: 2

Prefix 1.1.1.1 32

Source : Local

Router ID : 1010.1020.1030

Level : Not set

SID index : 100

Range : 1

Last prefix : 1.1.1.1/32

Last SID index: 100

Flags : -

Prefix 2.2.2.2 32

Source : Remote

Router ID : 1010.1020.1040

Level : L1

SID index : 200

Range : 1

Last prefix : 2.2.2.2/32

Last SID index: 200

Flags : -

# Display backup IS-IS SR prefix-SID mappings.

<Sysname> display isis segment-routing prefix-sid-map backup-policy

ISIS 1 - Backup policy

Number of mappings: 4

Prefix SID index Range Flags

2.2.2.2/32 200 30 -

12.12.12.1/32 44 3 -

8.8.8.8/32 600 20 -

2.2.2.2/32 10 10 -

# Display all IS-IS SR prefix-SID mappings.

<Sysname> display isis segment-routing prefix-sid-map

ISIS 1 – Both active policy and backup policy

Number of mappings: 9

Prefix SID index Range Flags

2.2.2.2/32 10 10 -

2.2.2.2/32 200 30 -

3.3.3.3/32 300 1 -

8.8.8.8/32 600 20 -

11.11.11.11/32 100 10 -

12.12.12.1/32 44 3 -

Table 4 Command output

Field	Description
SID index	Start SID index value.
Range	Number of consecutive SIDs assigned.
Flags	Mapping flags. The A flag indicates that the peer specified by the prefix is directly connected to the device. If no flags are set, this field display a hyphen (-).
Source	Source of the prefix-SID mapping: · Local—The mapping is configured on the local device. · Remote—The mapping is configured on the remote device.
Router ID	ID of the route advertiser.
Level	Level of the route advertiser: · L1—Level-1 IS-IS route. · L2—Level-2 IS-IS route. · Not set—The route was locally advertised.

display mpls static-sr-mpls

Use display mpls static-sr-mpls to display static SRLSP and adjacency segment information.

Syntax

display mpls static-sr-mpls { lsp [ lsp-name ] | adjacency [ adjacency-path-name ] }

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

lsp: Displays static SRLSP information.

lsp-name: Specifies a static SRLSP by its name, a case-sensitive string of 1 to 15 characters. If you do not specify this argument, the command displays information about all static SRLSPs.

adjacency: Displays static adjacency segment information.

adjacency-path-name: Specifies a static adjacency segment by its name, a case-sensitive string of 1 to 15 characters. If you do not specify this argument, the command displays information about all static adjacency segments.

Examples

# Display information about all static SRLSPs.

<Sysname> display mpls static-sr-mpls lsp lsp1

Name : lsp1

Type : LSP

In-Label : -

Out-Label : 60,70,80

Out-Interface : -

Nexthop : -

State : Up

Table 5 Command output

Field	Description
Name	Name of the static SRLSP or adjacency segment.
Type	Information type: · LSP—Static SRLSP information. · Adjacency—Adjacency segment information.
In-Label	Incoming label.
Out-Label	Outgoing label.
Out-Interface	Output interface.
Nexthop	Next hop address.
State	Status of the static SRLSP or adjacency segment: · Down—The static SRLSP or adjacency segment is not available. · Up—The static SRLSP or adjacency segment is available.

Related commands

static-sr-mpls adjacency

static-sr-mpls lsp

display mpls static-sr-mpls prefix

Use display mpls static-sr-mpls prefix to display static prefix segment information.

Syntax

display mpls static-sr-mpls prefix [ path lsp-name | destination ip-address [ mask | mask-length ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

path lsp-name: Displays static prefix segment information for the specified static SRLSP. The lsp-name argument specifies a static SRLSP by its name, a case-sensitive string of 1 to 15 characters.

destination ip-address: Displays static prefix segment information for the specified destination address. The ip-address argument specifies a destination address.

mask: Specifies the destination address mask.

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

Usage guidelines

If you do not specify any parameters, this command displays information about all static prefix segments.

Examples

# Display information about all static prefix segments.

<Sysname> display mpls static-sr-mpls prefix

Prefix Name : prefixname

Destination : 2.2.2.2/32

In-Label : 1024

Active : Yes(1)

Out-Interface : GE1/0

Nexthop : 10.0.0.2

Out-Label : 600000

Status : up

Out-Interface : GE2/0

Nexthop : 11.0.0.2

Out-Label : 600002

Status : down(No Route)

Out-Interface : GE3/0

Nexthop : 12.0.0.2

Out-Label : 600001

Status : down(No Mpls)

Table 6 Command output

Field	Description
Prefix Name	Name of the prefix segment.
Destination	Destination IP address of the prefix segment.
In-Label	Incoming label of the prefix segment.
Active	Status of the prefix segment: · Yes(count)—The prefix segment is active. The value of count represents the number of egresses in up status. · No—The prefix segment is inactive.
Out-Interface	Outgoing interface of the prefix segment.
Nexthop	Next hop of the prefix segment.
Out-Label	Outgoing label of the prefix segment.
Status	Status of the egress: · down—The egress is inactive. The cause is displayed in brackets, which can be No Route or No Mpls. No Route means that the device has no route to reach the destination IP address over the outgoing interface. No Mpls means that MPLS is disabled on the output interface. · up—The egress is active. · duplicate—An egress conflict has occurred because the output interface is already used by another prefix segment.

Related commands

static-sr-mpls prefix

display ospf segment-routing global-block

Use display ospf segment-routing global-block to display OSPF SRGB information.

Syntax

display ospf [ process-id ] [ area area-id ] segment-routing global-block

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

process-id: Specifies an OSPF process ID in the range of 1 to 65535. If you do not specify this argument, the command displays the SRGBs of all OSPF processes.

area area-id: Specifies an area by its ID. The area ID can be a value in dotted decimal notation or a decimal value in the range of 0 to 4294967295. If you specify a decimal value, the system automatically transforms it to a value in dotted decimal notation. If you do not specify this option, the command displays the SRGBs of all areas.

Examples

# Display the SRGBs of all OSPF processes.

<Sysname> display ospf segment-routing global-block

OSPF Process 1 with Router ID 1.1.1.1

Segment Routing Global Block

Area: 0.0.0.0

Router ID Min SID Max SID Total

1.1.1.1 16000 24000 8001

2.2.2.2 18000 18999 1000

3.3.3.3 16000 24000 8001

4.4.4.4 17000 17999 1000

5.5.5.5 16000 16999 1000

Table 7 Command output

Field	Description
Router ID	Router ID of the device or the neighbor.
Min SID	Minimum label value of the SRGB.
Max SID	Maximum label value of the SRGB.
Total	Number of labels in the SRGB.

Related commands

segment-routing global-block

display ospf segment-routing prefix-sid-map

Use display ospf segment-routing prefix-sid-map to display OSPF SR prefix-SID mappings.

Syntax

display ospf segment-routing prefix-sid-map [ active-policy | backup-policy ] [ process-id ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

active-policy: Displays active prefix-SID mappings.

backup-policy: Displays backup prefix-SID mappings.

process-id: Specifies an OSPF process ID in the range of 1 to 65535. If you do not specify this argument, the command displays information about all OSPF processes.

verbose: Displays detailed information. If you do not specify this keyword, the command displays brief information.

Usage guidelines

If you do not specify the active-policy or backup-policy keyword, the command displays information about both active and backup prefix-SID mappings.

Examples

# Display active OSPF SR prefix-SID mappings.

<Sysname> display ospf segment-routing prefix-sid-map active-policy

OSPF 1 - Active policy

Flags: IA - Inter-Area, L – Local, R - Remote

Number of mappings: 2

Prefix SID index Range Flags

1.1.1.11/32 10 10 L/-

1.1.1.22/32 20 20 R/-

# Display detailed information about active OSPF SR prefix-SID mappings.

<Sysname> display ospf segment-routing prefix-sid-map active-policy verbose

OSPF 1 - Active policy

Number of mappings: 2

Prefix 1.1.1.11

Source : Local

Router ID : 10.1.1.1

Area ID : Not set

LS ID : Not set

SID index : 10

Range : 10

Last prefix : 1.1.1.20

Last SID index: 19

Flags : -

Prefix 1.1.1.22

Source : Remote

Router ID : 10.2.1.1

Area ID : 0.0.0.1

LS ID : 7.0.0.0

SID index : 20

Range : 20

Last prefix : 1.1.1.41

Last SID index: 39

Flags : -

# Display backup OSPF SR prefix-SID mappings.

<Sysname> display ospf segment-routing prefix-sid-map backup-policy

OSPF 1 - Backup policy

Flags: IA - Inter-Area, L – Local, R - Remote

Number of mappings: 1

Prefix SID index Range Flags

1.1.1.33/32 30 30 R/IA

# Display all OSPF SR prefix-SID mappings.

<Sysname> display ospf segment-routing prefix-sid-map

OSPF 1 - Both active policy and backup policy

Flags: IA - Inter-Area, L – Local, R - Remote

Number of mappings: 3

Prefix SID index Range Flags

1.1.1.11/32 10 10 L/-

1.1.1.22/32 20 20 R/-

1.1.1.33/32 30 30 R/IA

Table 8 Command output

Field	Description
SID index	Start SID index value.
Range	Number of consecutive SIDs assigned.
Flags	Mapping flags: · IA—The prefix was from another area. · L—The mapping is a local mapping. · R—The mapping is a remote mapping. If no flags are set, this field display a hyphen (-).
Source	Source of the prefix-SID mapping: · Local—The mapping is configured on the local device. · Remote—The mapping is configured on the remote device.
Router ID	ID of the route advertiser.
Area ID	Area ID. If the mapping is a local mapping, this field displays Not set.
LS ID	Link state ID. If the mapping is a local mapping, this field displays Not set.

display segment-routing label-block

Use display segment-routing label-block to display SR label block information.

Syntax

display segment-routing label–block [ protocol { isis | ospf } ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

protocol: Specifies a protocol. If you do not specify this keyword, the command displays SR label block information about all protocols.

isis: Displays IS-IS SR label block information.

ospf: Displays OSPF SR label block information.

Examples

# Display SR label block information about all protocols.

<Sysname> display segment-routing label-block

Default label block:

SRLB: 15000-15999

SRGB: 16000-55999

Configurate label block:

SRLB: 200000-210000

SRGB: 16000-17000

Type Protocol Process-ID Label range State

SRLB Global - 200000-210000 Active

SRGB Global - 16000-17000 Active

Table 9 Command output

Field	Description
Type	Label block type, SRGB or SRLB.
Protocol	Protocol to which the label block belongs: · ISIS—A IS-IS process. · OSPF—An OSPF process. · Global—The label block is the global SRGB or SRLB, which is configured in segment routing view..
Process-ID	ID of the protocol process that owns the label block. If label block is the global SRGB or SRLB, this field displays a hyphen (-).
State	Whether the label block is available for use: · Active—The label block is available for use. · Inactive—The label block is not available for use.

display segment-routing mapping-server prefix-sid-map

Use display segment-routing mapping-server prefix-sid-map to display prefix-SID mappings.

Syntax

display segment-routing mapping-server prefix-sid-map [ ip-address mask-length | verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip-address: Specifies an IPv4 address prefix in dotted decimal notation.

mask-length: Specifies the mask length, in the range of 1 to 32.

verbose: Displays detailed information about all configured prefix-SID mappings.

Usage guidelines

If you do not specify any parameters, this command displays brief information about all configured prefix-SID mappings.

Examples

# Display the prefix-SID mapping for prefix 1.1.1.1.

<Sysname> display segment-routing mapping-server prefix-sid-map 1.1.1.1 32

SRMS mappings

Prefix SID index Range Flags

1.1.1.1/32 10 100 A

# Display all configured prefix-SID mappings.

<Sysname> display segment-routing mapping-server prefix-sid-map

SRMS mappings

Number of mappings: 2

Prefix SID index Range Flags

1.1.1.1/32 10 100 A

2.2.2.2/32 256 520 -

# Display detailed information about all configured prefix-SID mappings.

<Sysname> display segment-routing mapping-server prefix-sid-map verbose

SRMS mappings

Number of mappings: 2

Prefix 1.1.1.1/32

SID index : 10

Range : 100

Last prefix : 1.1.1.100/24

Last SID index: 109

Flags : A

Prefix 2.2.2.2/32

SID index : 256

Range : 520

Last prefix : 2.2.4.9/24

Last SID index: 775

Flags : -

Table 10 Command output

Field	Description
SID index	Start SID index value.
Range	Number of consecutive SIDs assigned.
Flags	Mapping flags. The A flag indicates that the peer specified by the prefix is directly connected to the device. If no flags are set, this field display a hyphen (-).
Last Prefix	Final prefix.
Last SID index	SID assigned to the final prefix.

fast-reroute microloop-avoidance enable

Use fast-reroute microloop-avoidance enable to enable FRR microloop avoidance.

Use undo fast-reroute microloop-avoidance enable to disable FRR microloop avoidance.

Syntax

In IS-IS IPv4 unicast address family view:

fast-reroute microloop-avoidance enable [ level-1 | level-2 ]

undo fast-reroute microloop-avoidance enable [ level-1 | level-2 ]

In OSPF view:

fast-reroute microloop-avoidance enable

undo fast-reroute microloop-avoidance enable

Default

FRR microloop avoidance is disabled.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Parameters

level-1: Specifies FRR microloop avoidance for IS-IS Level-1.

level-2: Specifies FRR microloop avoidance for IS-IS Level-2.

Usage guidelines

Use this command only on the source node.

On an network configured with TI-LFA FRR, if a node or link fails, traffic will be switched to the backup path calculated by TI-LFA. However, if a device along the backup path has not finished route convergence, traffic will be looped between the device and the source node (the node prior to the node or link that failed) until the device finishes route convergence.

To resolve this problem, configure microloop avoidance on the source node. Then, when a node or link fails, traffic will be switched to the backup path calculated by TI-LFA. The source node waits for a period of time for other devices to finish route convergence. After the delay time elapses, the source node starts route convergence.

If you do not specify the level-1 or level-2 keyword, the command enables or disables FRR microloop avoidance on all IS-IS levels.

Examples

# Enable FRR microloop avoidance for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] fast-reroute microloop-avoidance enable

# Enable FRR microloop avoidance for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] fast-reroute microloop-avoidance enable

Related commands

fast-reroute microloop-avoidance rib-update-delay

Use fast-reroute microloop-avoidance rib-update-delay to set the FRR microloop avoidance RIB-update-delay time.

Use undo fast-reroute microloop-avoidance rib-update-delay to restore the default.

Syntax

In IS-IS IPv4 unicast address family view:

fast-reroute microloop-avoidance rib-update-delay delay-time [ level-1 | level-2 ]

undo fast-reroute microloop-avoidance rib-update-delay [ level-1 | level-2 ]

In OSPF view:

fast-reroute microloop-avoidance rib-update-delay delay-time

undo fast-reroute microloop-avoidance rib-update-delay

Default

The FRR microloop avoidance RIB-update-delay time is 5000 ms.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Parameters

delay-time: Specifies the FRR microloop avoidance RIB-update-delay time in milliseconds. The value range is 1 to 60000.

level-1: Specifies the FRR microloop avoidance RIB-update-delay time for IS-IS Level-1.

level-2: Specifies the FRR microloop avoidance RIB-update-delay time for IS-IS Level-2.

Usage guidelines

Use this command only on the source node.

If you do not specify the level-1 or level-2 keyword, the command sets the FRR microloop avoidance RIB-update-delay time for all IS-IS levels.

Examples

# Set the FRR microloop avoidance RIB-update-delay time to 6000 ms for Level-1 of IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] fast-reroute microloop-avoidance rib-update-delay 6000 level-1

# Set the FRR microloop avoidance RIB-update-delay time to 6000 ms for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] fast-reroute microloop-avoidance rib-update-delay 6000

Related commands

fast-reroute microloop-avoidance

fast-reroute ti-lfa

Use fast-reroute ti-lfa to enable Topology-Independent Loop-Free Alternate Fast Re-Route (TI-LFA FRR).

Use fast-reroute ti-lfa to disable TI-LFA FRR.

Syntax

In IS-IS IPv4 unicast address family view:

fast-reroute ti-lfa [ per-prefix ] [ route-policy route-policy-name | host ] [ level-1 | level-2 ]

undo fast-reroute ti-lfa [ level-1 | level-2 ]

In OSPF view:

fast-reroute ti-lfa [ per-prefix ] [ route-policy route-policy-name | host ]

undo fast-reroute ti-lfa

Default

TI-LFA FRR is disabled.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Parameters

level-1: Specifies TI-LFA FRR for IS-IS Level-1.

level-2: Specifies TI-LFA FRR for IS-IS Level-2.

per-prefix: Calculates backup information for each advertising source of a route. Specify this keyword only if routes are advertised by multiple sources. If you do not specify this keyword, the device calculates backup information for each route.

route-policy route-policy-name: Enables TI-LFA FRR for prefixes identified by the routing policy. The route-policy-name argument specifies a routing policy by its name, a case-sensitive string of 1 to 63 characters.

host: Enables TI-LFA for host routes.

Usage guidelines

TI-LFA FRR provides link and node protection for SR tunnels. When a link or node fails, TI-LFA FRR switches the traffic to the backup path to ensure continuous data forwarding.

Before configuring TI-LFA FRR, you must execute the following commands in IS-IS IPv4 unicast address family view or OSPF view:

· segment-routing mpls

· fast-reroute lfa

TI-LFA FRR takes effect only after you enable LFA FRR.

TI-LFA FRR operates in a level only after you enable LFA FRR for the level.

If you do not specify the level-1 or level-2 keyword, the command enables or disables TI-LFA FRR for all IS-IS levels.

If you do not specify the route-policy route-policy-name option or the host keyword, the device calculates backup information for all routes.

Examples

# Enable TI-LFA FRR for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] fast-reroute ti-lfa

# Enable TI-LFA FRR for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] fast-reroute ti-lfa

Related commands

fast-reroute (Layer 3—IP Routing Command Reference)

route-policy (Layer 3—IP Routing Command Reference)

segment-routing mpls

global-block

Use global-block to configure the global MPLS SRGB.

Use undo global-block to restore the default.

Syntax

global-block minimum-value maximum-value

undo global-block

Default

The global MPLS SRGB is from 16000 to 24000.

Views

Segment routing view

Predefined user roles

network-admin

Parameters

minimum-value: Specifies the minimum label value. The value range is 1024 to 1048574.

maximum-value: Specifies the maximum label value. The value range is 1025 to 1048575.

Usage guidelines

The global MPLS SRGB is used for prefix segments and BGP prefix SIDs. If no MPLS SRGB is configured for a protocol process, the process uses the global MPLS SRGB.

If you have configured prefix SIDs when you configure the global MPLS SRGB, the global MPLS SRGB must contain the configured prefix SIDs.

Examples

# Configure the global MPLS SRGB to be from 200000 to 220000.

<Sysname> system-view

[Sysname] segment-routing

[Sysname-segment-routing] global-block 200000 220000

Related commands

segment-routing global-block

isis adjacency-sid

Use isis adjacency-sid to assign an IS-IS adjacency SID to an IS-IS adjacency.

Use undo isis adjacency-sid to reclaim an IS-IS adjacency SID.

Syntax

isis adjacency-sid { absolute absolute-value | index index-value } [ nexthop nexthop-address ]

undo isis adjacency-sid { absolute absolute-value | index index-value }

Default

An IS-IS adjacency does not have an adjacency SID.

Views

Interface view

Predefined user roles

network-admin

Parameters

absolute absolute-value: Specifies an absolute value as the adjacency SID. The value range for the absolute-value argument is 1024 to 1048575.

index index-value: Specifies an adjacency SID index value. The value range for the index-value argument is 0 to 1047551.

nexthop nexthop-address: Specifies a next hop by its IP address. If the network type of the interface is broadcast, you must specify this option. If the network type of the interface is P2P, you cannot specify this option.

Usage guidelines

After you enable MPLS SR adjacency label allocation, the device randomly allocates adjacency SIDs to the links to its IGP neighbors. If the link to an IGP neighbor flaps, the adjacency SID of the link keeps changing. For a link to always use the same adjacency SID, use this command to assign a specific adjacency SID to the link.

You can assign adjacency SID by using absolute values or index values. If you use index values, the adjacency SID of a link is the base value of the SRLB plus the index value for the link.

Before assigning adjacency SIDs, execute the display mpls label command to display the usage status of the labels that you want to assign as adjacency SIDs. Make sure the labels are in Idle state. A label that is not in Idle state is being used by another protocol. If you assign it to a link as an adjacency SID, the adjacency SID is not available even if the status of the label changes to Idle later. To use the adjacency SID, you must remove the adjacency SID assignment and assign the adjacency SID again.

Before executing the isis adjacency-sid command on an interface, you must complete the following tasks:

· Enable IS-IS on the interface.

· Execute the segment-routing mpls and segment-routing adjacency enable commands.

If you execute the isis adjacency-sid command multiple times on an interface of the P2P network type, the most recent configuration takes effect.

If you execute the isis adjacency-sid command multiple times on an interface of the broadcast network type, the effective configuration varies depending on how you specify the next hop address:

· If you specify a different next hop address each time, all configurations take effect.

· If you specify the same next hop address each time, the most recent configuration takes effect.

To change the network type of an interface, execute the isis circuit-type p2p command before executing the isis adjacency-sid command on the interface. To change the network type of an interface after assigning an adjacency SID to the interface, you must remove the assignment first.

If you execute this command on an interface after enabling MPLS SR adjacency label allocation for an IGP, the interface prefers the assigned adjacency SID.

Examples

# Set the absolute value of the adjacency SID to 20000 on interface GigabitEthernet 1/0. Specify 1.1.1.1 as the next hop.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0

[Sysname-GigabitEthernet1/0] isis enable 1

[Sysname-GigabitEthernet1/0] isis adjacency-sid absolute 20000 nexthop 1.1.1.1

Related commands

display mpls label (MPLS Command Reference)

isis circuit-type p2p (Layer 3—IP Routing Command Reference)

isis enable (Layer 3—IP Routing Command Reference)

segment-routing adjacency enable

segment-routing mpls

isis fast-reroute ti-lfa disable

Use isis fast-reroute ti-lfa disable to disable an IS-IS interface from participating in TI-LFA calculation.

Use undo isis fast-reroute ti-lfa disable to enable an IS-IS interface to participate in TI-LFA calculation.

Syntax

isis fast-reroute ti-lfa disable [ level-1 | level-2 ]

undo isis fast-reroute ti-lfa disable [ level-1 | level-2 ]

Default

An IS-IS interface participates in TI-LFA calculation.

Views

Interface view

Predefined user roles

network-admin

Parameters

level-1: Specifies TI-LFA calculation on IS-IS Level-1.

level-2: Specifies TI-LFA calculation on IS-IS Level-2.

Usage guidelines

Disable the output interface to the primary next hop from participating in TI-LFA calculation.

If you do not specify the level-1 or level-2 keyword, the command disables or enables the interface to participate in TI-LFA calculation in any level.

Examples

# Disable interface GigabitEthernet 1/0 from participating in TI-LFA calculation.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0

[Sysname-GigabitEthernet1/0] isis enable 1

[Sysname-GigabitEthernet1/0] isis fast-reroute ti-lfa disable

Related commands

fast-reroute ti-lfa

isis prefix-sid

Use isis prefix-sid to configure an IS-IS prefix SID.

Use undo isis prefix-sid to restore the default.

Syntax

isis prefix-sid { absolute absolute-value | index index-value } [ n-flag-clear | { explicit-null | no-php } ] *

undo isis prefix-sid

Default

No IS-IS prefix SID is configured.

Views

Loopback interface view

Predefined user roles

network-admin

Parameters

absolute absolute-value: Specifies an absolute value as the prefix SID. The value range for the absolute-value argument is 1024 to 1048575.

index index-value: Specifies an index value in the range of 0 to 1047551.

n-flag-clear: Sets the Node-SID flag bit of the prefix SID to 0 to use the prefix SID for a group of SR nodes. If you do not specify this keyword, the flag bit is 1 and the prefix SID is used for a single SR node.

explicit-null: Sets the Explicit-null flag bit of the prefix SID to 1. This setting requires that the upstream neighbor uses an explicit null label to replace the prefix SID. If you do not specify this keyword, the flag bit is 0 and the upstream neighbor continues to forward the packet based on the prefix SID. For more information about the explicit null label, see MPLS basics configuration in MPLS Configuration Guide.

no-php: Sets the P-flag bit of the prefix SID to 1 so the penultimate hop does not pop out the SID. If you do not specify this keyword, the P-flag bit is 0 and the penultimate hop pops out the SID.

Usage guidelines

An absolute value used as the prefix SID must be in the SRGB of the node.

If you specify an index value, the sum of the index value and the SRGB base value is used as the prefix SID. The prefix SID must be in the SRGB of the node.

To use a prefix SID for a group of SR nodes in anycast scenarios, specify the n-flag-clear keyword to set the Node-SID flag bit of the prefix SID to 0.

To configure an IS-IS prefix SID, you must enable an IS-IS process on the loopback interface.

If you execute this command on an interface multiple times, the most recent configuration takes effect.

Examples

# Set the IS-IS prefix SID index value to 20 on loopback interface 1.

<Sysname> system-view

[Sysname] interface loopback 1

[Sysname-LoopBack1] isis enable 1

[Sysname-LoopBack1] isis prefix-sid index 20

local-block

Use local-block to configure the SRLB.

Use undo local-block to restore the default.

Syntax

local-block minimum-value maximum-value

undo local-block

Default

The MPLS SRLB is from 15000 to 15999.

Views

Segment routing view

Predefined user roles

network-admin

Parameters

minimum-value: Specifies the minimum label value. The value range is 1024 to 1048574.

maximum-value: Specifies the maximum label value. The value range is 1025 to 1048575.

Usage guidelines

The segment routing local block (SRLB) is the range of local labels dedicated for MPLS SR adjacency SIDs.

Before executing this command, use the display mpls label command to display MPLS label usage information. Make sure that all labels in the specified range are idle. If a label in the range is not idle, the MPLS SRLB takes effect only after you save the running configuration and reboot the device.

Examples

# Set the SRLB to be from 200000 to 220000.

<Sysname> system-view

[Sysname] segment-routing

[Sysname-segment-routing] local-block 200000 220000

Related commands

display mpls label (MPLS Command Reference)

mapping-server prefix-sid-map

Use mapping-server prefix-sid-map to configure a prefix-SID mapping.

Use undo mapping-server prefix-sid-map to delete a prefix-SID mapping.

Syntax

mapping-server prefix-sid-map ip-address mask-length start-value [ range range-value ] [ attached ]

undo mapping-server prefix-sid-map ip-address mask-length

Default

No prefix-SID mappings exist.

Views

Segment routing view

Predefined user roles

network-admin

Parameters

ip-address: Specifies an IPv4 address prefix to be mapped or specifies the start IP prefix for a range of prefix-SID mappings, in dotted decimal notation.

mask-length: Specifies the mask length, in the range of 1 to 32.

start-value: Specifies the index value of the SID to be mapped to the specified prefix, or specifies the index value of the start SID for a range of prefix-SID mappings. The value range for this argument is 0 to 1047550.

range range-value: Specifies the number of prefix-SID mappings, in the range of 1 to 1048551. Specify this option if you want to configure more than one mapping by using a single command. The system creates the specified number of mappings, starting from the start IP prefix and SID index value. The increment step for the prefix and SID index value is 1.

attached: Specifies that the specified prefixes represent local networks.

Usage guidelines

The specified prefixes must not belong to any existing prefix-SID mappings.

Before you configure prefix-SID mappings in bulk, plan the number of mappings. Make sure there are enough mappings to use.

If you specify a value greater than 65535 for the range-value argument, the prefix-SID mappings cannot be advertised through IS-IS or OSPF.

Examples

# Map prefix 1.1.1.1/32 to SID index value 100.

<Sysname> system-view

[Sysname] segment-routing

[Sysname-segment-routing] mapping-server prefix-sid-map 1.1.1.1 32 100

# Configure two prefix-SID mappings, starting from prefix 10.1.1.1/32 and SID index value 200.

<Sysname> system-view

[Sysname] segment-routing

[Sysname-segment-routing] mapping-server prefix-sid-map 10.1.1.1 32 200 range 2

In the first mapping, the prefix is 10.1.1.1/32 and the SID is 200. In the second mapping, the prefix is 10.1.1.2/32 and the SID is 201.

mpls te static-sr-mpls

Use mpls te static-sr-mpls to bind a static SRLSP to an MPLS TE tunnel interface.

Use undo mpls te static-sr-mpls to unbind a static SRLSP from an MPLS TE tunnel interface.

Syntax

mpls te static-sr-mpls lsp-name [ backup ]

undo mpls te static-sr-mpls lsp-name

Default

An MPLS TE tunnel interface does not use any static SRLSPs.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

lsp-name: Specifies a static SRLSP by its name, a case-sensitive string of 1 to 15 characters. The specified static SRLSP must be already created by using the static-sr-mpls lsp command.

backup: Specifies the backup static SRLSP. If you do not specify this keyword, this command specifies the main static SRLSP.

Usage guidelines

Execute this command only on the ingress node of a static SRLSP.

This command takes effect only if you have configured the mpls te signaling static command in tunnel interface view.

You can specify the backup keyword to bind a backup static SRLSP only if both the main and backup SRLSPs are established by using the adjacency segment method.

If you execute both the mpls te static-sr-mpls and mpls te static-cr-lsp commands on the device, only the mpls te static-cr-lsp command takes effect. For the mpls te static-sr-mpls command to take effect, execute the undo mpls te static-cr-lsp command.

Examples

# Bind static SRLSP static-sr-3 to MPLS TE tunnel interface 0.

<Sysname> system-view

[Sysname] interface tunnel 0 mode mpls-te

[Sysname-Tunnel0] mpls te static-sr-mpls static-sr-3

Related commands

display mpls te tunnel-interface (MPLS Command Reference)

mpls te signaling (MPLS Command Reference)

mpls te static-cr-lsp (MPLS Command Reference)

static-sr-mpls lsp

ospf adjacency-sid

Use ospf adjacency-sid to assign an OSPF adjacency SID to an OSPF adjacency.

Use undo ospf adjacency-sid to reclaim an OSPF adjacency SID.

Syntax

ospf adjacency-sid { absolute absolute-value | index index-value } [ nexthop nexthop-address ]

undo ospf adjacency-sid { absolute absolute-value | index index-value }

Default

An OSPF adjacency does not have an adjacency SID.

Views

Interface view

Predefined user roles

network-admin

Parameters

absolute absolute-value: Specifies an absolute value as the adjacency SID. The value range for the absolute-value argument is 1024 to 1048575.

index index-value: Specifies an adjacency SID index value in the range of 0 to 1047551.

nexthop nexthop-address: Specifies a next hop by its IP address. If the network type of the interface is not P2P, you must specify this option. If the network type of the interface is P2P, you cannot specify this option.

Usage guidelines

You can assign adjacency SID by using absolute values or index values. If you If you use index values, the adjacency SID of a link is the base value of the SRLB plus the index value for the link.

The ospf adjacency-sid command takes effect only after you execute the segment-routing mpls and segment-routing adjacency enable commands.

If you execute the ospf adjacency-sid command on an interface after enabling MPLS SR adjacency label allocation for an IGP, the interface prefers the assigned adjacency SID.

If you execute the ospf adjacency-sid command multiple times on an interface of the P2P network type, the most recent configuration takes effect.

If you execute the ospf adjacency-sid command multiple times on an interface of the broadcast network type, the effective configuration varies depending on how you specify the next hop address:

· If you specify a different next hop address each time, all configurations take effect.

· If you specify the same next hop address each time, the most recent configuration takes effect.

To change the network type of an interface, execute the ospf network-type command.

Examples

# Set the absolute value of the adjacency ID to 20000 on interface GigabitEthernet 1/0. Specify 1.1.1.1 as the next hop.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0

[Sysname-GigabitEthernet1/0] ospf adjacency-sid absolute 20000 nexthop 1.1.1.1

Related commands

display mpls label (MPLS Command Reference)

ospf network-type (Layer 3—IP Routing Command Reference)

segment-routing adjacency enable

segment-routing mpls

ospf fast-reroute ti-lfa disable

Use ospf fast-reroute ti-lfa disable to disable an OSPF interface from participating in TI-LFA calculation.

Use undo ospf fast-reroute ti-lfa disable to enable an OSPF interface to participate in TI-LFA calculation.

Syntax

ospf fast-reroute ti-lfa disable

undo ospf fast-reroute ti-lfa disable

Default

An OSPF interface participates in TI-LFA calculation.

Views

Interface view

Predefined user roles

network-admin

Usage guidelines

On the source node, the route's output interface to the primary next hop might not be on the backup path calculated by TI-LFA. Disable TI-LFA on the interface to prevent it from participating in TI-LFA calculation.

Examples

# Disable interface GigabitEthernet 1/0 from participating in TI-LFA calculation.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0

[Sysname-GigabitEthernet1/0] ospf fast-reroute ti-lfa disable

Related commands

fast-reroute ti-lfa (OSPF view)

ospf prefix-sid

Use ospf prefix-sid to configure an OSPF prefix SID.

Use undo ospf prefix-sid to restore the default.

Syntax

ospf process-id prefix-sid { absolute absolute-value | index index-value } [ n-flag-clear | { explicit-null | no-php } ] *

undo ospf process-id prefix-sid

Default

No OSPF prefix SID is configured.

Views

Loopback interface view

Predefined user roles

network-admin

Parameters

process-id: Specifies an OSPF process ID in the range of 1 to 65535.

absolute absolute-value: Specifies an absolute value as the prefix SID. The value range for the absolute-value argument is 1024 to 1048575.

index index-value: Specifies an index value in the range of 0 to 1047551.

no-php: Sets the P-flag bit of the prefix SID to 1 so the penultimate hop does not pop out the SID. If you do not specify this keyword, the P-flag bit is 0 and the penultimate hop pops out the SID.

Usage guidelines

An absolute value used as the prefix SID must be in the SRGB of the node.

If you specify an index value, the sum of the index value and the SRGB base value is used as the prefix SID. The prefix SID must be in the SRGB of the node.

To use a prefix SID for a group of SR nodes in anycast scenarios, specify the n-flag-clear keyword to set the Node-SID flag bit of the prefix SID to 0.

The configured OSPF prefix SID takes effect only if the OSPF process enabled on the loopback interface is the same as the OSPF process associated with the prefix SID.

If you execute this command on an interface multiple times, the most recent configuration takes effect.

Examples

# Set the OSPF prefix SID index value to 20 on loopback interface 1.

<Sysname> system-view

[Sysname] interface loopback 1

[Sysname-LoopBack1] ospf 1 prefix-sid index 20

peer egress-engineering

Use peer egress-engineering to enable BGP EPE for a peer or peer group and specify a routing policy to assign a label (SID) to the peer or peer group.

Use undo peer egress-engineering to restore the default for a peer or peer group.

Syntax

peer { group-name | ipv4-address [ mask-length ] } egress-engineering [ adjacency | set ] [ route-policy policy-name ]

undo peer { group-name | ipv4-address [ mask-length ] } egress-engineering

Default

BGP EPE is disabled.

Views

BGP instance view

Predefined user roles

network-admin

Parameters

group-name: Specifies an existing peer group by its name, a case-sensitive string of 1 to 47 characters.

ipv4-address: Specifies the IPv4 address of an existing peer.

mask-length: Specifies the mask length, in the range of 0 to 32. This argument and the ipv4-address argument together specify a subnet. If you specify this argument, the command applies to dynamic peers on the specified subnet.

adjacency: Assigns a Peer-Adjacency-SID.

set: Assigns a Peer-Set-SID.

route-policy route-policy-name: Specifies a routing policy by its name, a case-sensitive string of 1 to 63 characters. If you do not specify this option, the device assigns SIDs to neighbors randomly.

Usage guidelines

If you do not specify the adjacency or set keyword, the device assigns a Peer-Node-SID.

You cannot assign the same SID to multiple BGP peers or peer groups.

You can specify the same routing policy only when you assign set type SIDs to BGP peers or peer groups.

You can use if-match interface as a filtering condition only if the EBGP session is established by using loopback interfaces.

Examples

# Enable BGP EPE for peer 1.1.1.1 and assign a Peer-Node-SID to the peer.

<Sysname> system-view

[Sysname] bgp 100

[Sysname-bgp-default] peer 1.1.1.1 egress-engineering

segment-routing

Use segment-routing to enable segment routing and enter segment routing view.

Use undo segment-routing to disable segment routing.

Syntax

segment-routing

undo segment-routing

Default

Segment routing is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

To configure the Segment Routing Mapping Server (SRMS) features, you must execute this command on the SRMS. The SRMS is an entity that advertises prefix-SID mappings in an IGP. By deploying an SRMS, you can allocate SIDs to devices that do not support MPLS SR, allowing for MPLS SR and LDP interworking.

Examples

# Enable segment routing and enter segment routing view.

<Sysname> system-view

[Sysname] segment-routing

[Sysname-segment-routing]

segment-routing adjacency enable

Use segment-routing adjacency enable to enable MPLS SR adjacency label allocation.

Use undo segment-routing adjacency enable to disable MPLS SR adjacency label allocation.

Syntax

segment-routing adjacency enable

undo segment-routing adjacency enable

Default

MPLS SR adjacency label allocation is disabled.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Usage guidelines

For this command to take effect, you must enable MPLS SR.

Examples

# Enable MPLS SR adjacency label allocation for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] segment-routing adjacency enable

# Enable MPLS SR adjacency label allocation for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing adjacency enable

Related commands

segment-routing mpls

segment-routing global-block

Use segment-routing global-block to configure the MPLS SRGB.

Use undo segment-routing global-block to restore the default.

Syntax

segment-routing global-block minimum-value maximum-value

undo segment-routing global-block

Default

The MPLS SRGB is from 16000 to 24000.

Views

IS-IS view

OSPF view

Predefined user roles

network-admin

Parameters

minimum-value: Specifies the minimum label value, in the range of 1024 to 1048574.

maximum-value: Specifies the maximum label value, in the range of 1025 to 1048575.

Usage guidelines

If you have configured prefix SIDs when you configure the SRGB, the SRGB must contain the configured prefix SIDs. If the SRGB does not contain the configured prefix SIDs, the configured prefix SIDs do not take effect.

In the following situations, the configured SRGB takes effect after a device reboot:

· The SRGB contains a label that is already used by another protocol. For example, the SRGB contains a label that is already used by LDP.

· The SRGB overlaps with the label range of another protocol. For example, the SRGB for OSPF process 1 overlaps with the SRGB for IS-IS process 1.

Examples

# Configure the MPLS SRGB to be from 17000 to 22000 for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] segment-routing global-block 17000 22000

# Configure the MPLS SRGB to be from 17000 to 22000 for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing global-block 17000 22000

Related commands

global-block

segment-routing mapping-server advertise-local

Use segment-routing mapping-server advertise-local to enable advertisement of locally configured prefix-SID mappings.

Use undo segment-routing mapping-server advertise-local to disable advertisement of locally configured prefix-SID mappings.

Syntax

segment-routing mapping-server advertise-local

undo segment-routing mapping-server advertise-local

Default

Advertisement is disabled for locally configured prefix-SID mappings.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Usage guidelines

In an SR to LDP interworking scenario, you must execute this command on the SRMS so the device advertises locally configured prefix-SID mappings to neighbors.

Examples

# Enable IS-IS to advertise locally configured prefix-SID mappings for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] segment-routing mapping-server advertise-local

# Enable OSPF to advertise locally configured prefix-SID mappings for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing mapping-server advertise-local

Related commands

mapping-server prefix-sid-map

segment-routing mapping-server receive

Use segment-routing mapping-server receive to enable reception of prefix-SID mappings.

Use undo segment-routing mapping-server receive to disable reception of prefix-SID mappings.

Syntax

segment-routing mapping-server receive

undo segment-routing mapping-server receive

Default

Reception of prefix-SID mappings is enabled.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Usage guidelines

In an SR to LDP interworking scenario, you must execute this command on the SRMCs so they can identify the prefix-SID mappings advertised by the SRMS.

Examples

# Disable reception of prefix-SID mappings for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] undo segment-routing mapping-server receive

# Disable reception of prefix-SID mappings for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] undo segment-routing mapping-server receive

Related commands

mapping-server prefix-sid-map

mapping-server prefix-sid-map advertise-local

segment-routing microloop-avoidance enable

Use segment-routing microloop-avoidance enable to enable SR microloop avoidance.

Use undo segment-routing microloop-avoidance enable to disable SR microloop avoidance.

Syntax

segment-routing microloop-avoidance enable [ level-1 | level-2 ]

undo segment-routing microloop-avoidance enable [ level-1 | level-2 ]

Default

SR microloop avoidance is disabled.

Views

IS-IS IPv4 unicast address family view

Predefined user roles

network-admin

Parameters

level-1: Specifies SR microloop avoidance for IS-IS Level-1.

level-2: Specifies SR microloop avoidance for IS-IS Level-2.

Usage guidelines

After a network failure occurs or recovers, route convergence occurs on relevant network devices. Because of non-simultaneous convergence on network devices, microloops might be formed. After you configure SR microloop avoidance, the devices will forward traffic along the specified path before route convergence is finished on all the relevant network devices. Because the forwarding path is independent of route convergence, microloops are avoided.

If you execute both this command and the fast-reroute microloop-avoidance enable command, this command takes effect.

If you do not specify the level-1 or level-2 keyword, the segment-routing microloop-avoidance enable command enables or disables SR microloop avoidance on all IS-IS levels.

Examples

# Enable SR microloop avoidance for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] segment-routing microloop-avoidance enable

Related commands

fast-reroute microloop-avoidance enable

segment-routing microloop-avoidance rib-update-delay

Use segment-routing microloop-avoidance rib-update-delay to set the SR microloop avoidance RIB-update-delay time.

Use undo segment-routing microloop-avoidance rib-update-delay to restore the default.

Syntax

segment-routing microloop-avoidance rib-update-delay delay-time [ level-1 | level-2 ]

undo segment-routing microloop-avoidance rib-update-delay [ level-1 | level-2 ]

Default

The SR microloop avoidance RIB-update-delay time is 5000 ms.

Views

IS-IS IPv4 unicast address family view

Predefined user roles

network-admin

Parameters

delay-time: Specifies the SR microloop avoidance RIB-update-delay time in milliseconds. The value range is 1 to 60000.

level-1: Specifies the SR microloop avoidance RIB-update-delay time for IS-IS Level-1.

level-2: Specifies the SR microloop avoidance RIB-update-delay time for IS-IS Level-2.

Usage guidelines

To leave sufficient time for IGP to finish route convergence, specify a proper value for the SR microloop avoidance RIB-update-delay timer. Before the timer expires, failure relevant devices will forward traffic along the specified path. After the timer expires, traffic will traverse the usual path.

If you do not specify the level-1 or level-2 keyword, this command sets the SR microloop avoidance RIB-update-delay time for all IS-IS levels.

Examples

# Set the SR microloop avoidance RIB-update-delay time to 6000 ms for IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] segment-routing microloop-avoidance rib-update-delay 6000

Related commands

segment-routing microloop-avoidance enable

segment-routing mpls

Use segment-routing mpls to enable MPLS SR.

Use undo segment-routing mpls to disable MPLS SR.

Syntax

segment-routing mpls

undo segment-routing mpls

Default

MPLS SR is disabled.

Views

IS-IS IPv4 unicast address family view

OSPF view

BGP IPv4 unicast address family view

Predefined user roles

network-admin

Usage guidelines

For MPLS SR to take effect, perform the following tasks before configuring the IGP to support MPLS SR:

· If the IGP is IS-IS, set the cost style to wide, compatible, or wide-compatible. For more information about the cost style, see IS-IS configuration in Layer 3—IP Routing Configuration Guide.

· If the IGP is OSPF, enable opaque LSA reception and advertisement capability. For more information about the capability, see OSPF configuration in Layer 3—IP Routing Configuration Guide.

Examples

# Enable MPLS SR in IS-IS IPv4 unicast address family view of IS-IS process 1.

<Sysname> system-view

[Sysname] isis 1

[Sysname-isis-1] cost-style wide

[Sysname-isis-1] address-family ipv4

[Sysname-isis-1-ipv4] segment-routing mpls

# Enable MPLS SR for OSPF process 1.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing mpls

# Enable MPLS SR for the BGP IPv4 unicast address family.

<Sysname> system-view

[Sysname] bgp 100

[Sysname-bgp-default] address family ipv4 unicast

[Sysname-bgp-default-ipv4] segment-routing mpls

Related commands

cost-style (Layer 3—IP Routing Command Reference)

opaque-capability enable (Layer 3—IP Routing Command Reference)

segment-routing sr-prefer

Use segment-routing sr-prefer to configure the device to prefer SRLSPs in traffic forwarding.

Use undo segment-routing sr-prefer to restore the default.

Syntax

segment-routing sr-prefer [ prefix-list prefix-list-name ]

undo segment-routing sr-prefer

Default

The device prefers LDP LSPs in traffic forwarding.

Views

IS-IS IPv4 unicast address family view

OSPF view

Predefined user roles

network-admin

Parameters

prefix-list prefix-list-name: Specifies an IP address prefix list by its name, a case-sensitive string of 1 to 63 characters. The device preferentially uses SRLSPs to forward traffic destined for addresses on the prefix list, and preferentially uses LDP LSPs to forward traffic destined for other addresses. If you do not specify an IP address prefix list, the device preferentially uses SRLSPs to forward all traffic.

Usage guidelines

This command determines whether the device prefers SRLSPs or LDP LSPs when both SRLSPs and LDP LSPs are available for traffic forwarding.

This command takes effect only when MPLS SR is enabled and the SRLSPs use prefix SIDs.

Examples

# Configure the device to preferentially use SRLSPs established by OSPF to forward all traffic.

<Sysname> system-view

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing sr-prefer

# Configure the device to preferentially use SRLSPs established by OSPF to forward traffic that is identified by prefix list 8.

<Sysname> system-view

[Sysname] ip prefix-list 8 permit 4.4.4.4 32

[Sysname] ospf 1

[Sysname-ospf-1] segment-routing sr-prefer prefix-list 8

Related commands

ip prefix-list (Layer 3—IP Routing Command Reference)

segment-routing mpls

static-sr-mpls adjacency

Use static-sr-mpls adjacency to configure an adjacency segment for static MPLS SR.

Use undo static-sr-mpls adjacency to delete an adjacency segment.

Syntax

static-sr-mpls adjacency adjacency-path-name in-label label-value { nexthop ip-address | outgoing-interface interface-type interface-number }

undo static-sr-mpls adjacency adjacency-path-name

Default

No adjacency segments exist.

Views

System view

Predefined user roles

network-admin

Parameters

adjacency-path-name: Specifies the adjacency segment name, a case-sensitive string of 1 to 15 characters.

in-label label-value: Specifies the incoming label, in the range of 16 to 1023.

nexthop ip-address: Specifies the next hop address.

outgoing-interface interface-type interface-number: Specifies an output interface by its type and number. The output interface must be a P2P interface.

Usage guidelines

Execute this command on all nodes of a static SRLSP.

If you specify the next hop address, make sure the following requirements are met:

· The device has a route to reach the next hop address.

· MPLS is enabled on the output interface of the route.

If you specify an output interface, make sure the following requirements are met:

· The interface is up.

· The interface can receive direct routes.

· MPLS is enabled on the interface.

The incoming label specified by this command must be different than existing static LSPs, static PWs, and static CRLSPs. If not, the configured adjacency segment is unavailable. The adjacency segment cannot become available even if you change the incoming label of the static LSP, static PW, or static CRLSP. To resolve this problem, you must delete the existing adjacency segment and configure a new one with a different incoming label.

Examples

# Configure an adjacency segment named adj1. Set the incoming label to 100 and the next hop address to 12.2.1.2.

<Sysname> system-view

[Sysname] static-sr-mpls adjacency adj1 in-label 100 nexthop 12.2.1.2

Related commands

display static-sr-mpls

static-sr-mpls lsp

Use static-sr-mpls lsp to configure a static SRLSP.

Use undo static-sr-mpls lsp to delete a static SRLSP.

Syntax

static-sr-mpls lsp lsp-name out-label out-label-value&<1-n>

undo static-sr-mpls lsp lsp-name

Default

No static SRLSPs exist.

Views

System view

Predefined user roles

network-admin

Parameters

lsp-name: Specifies the static SRLSP name, a case-sensitive string of 1 to 15 characters.

out-label out-label-value&<1-n>: Specifies a space-separated list of up to n outgoing labels, corresponding to the labels from top to bottom in the label stack. The value range for the out-label-value argument is 0, 3, and 16 to 1048575. The value of n is 7.

Usage guidelines

Execute this command only on the ingress node of a static SRLSP.

The outgoing labels represent an ordered list of labels allocated for the adjacencies or nodes that a static SRLSP traverses. The top label is the label that the ingress node allocates for the adjacency or destination prefix.

Examples

# Configure a static SRLSP named lsp1. Specify outgoing labels 100 and 200 for the SRLSP.

<Sysname> system-view

[Sysname] static-sr-mpls lsp lsp1 out-label 100 200

Related commands

static-sr-mpls adjacency

static-sr-mpls prefix

Use static-sr-mpls prefix to configure a prefix segment for static MPLS SR.

Use undo static-sr-mpls prefix to delete a prefix segment.

Syntax

static-sr-mpls prefix prefix-path-name destination ip-address { mask | mask-length } in-label in-label-value [ { nexthop ip-address | outgoing-interface interface-type interface-number } out-label out-label-value ]

undo static-sr-mpls prefix prefix-path-name [ destination ip-address { mask | mask-length } in-label in-label-value [ nexthop ip-address | output-interface interface-type interface-number ] ]

Default

No prefix segments exist.

Views

System view

Predefined user roles

network-admin

Parameters

prefix-path-name: Specifies the prefix segment name, a case-sensitive string of 1 to 15 characters.

destination ip-address: Specifies the destination IP address.

mask: Specifies the mask.

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

in-label label-value: Specifies the incoming label, in the range of 16 to 1023.

nexthop ip-address: Specifies the next hop address.

outgoing-interface interface-type interface-number: Specifies an output interface by its type and number. The output interface must be a P2P interface.

out-label out-label-value: Specifies the outgoing label, in the range of 0, 3, and 16 to 1048575.

Usage guidelines

Execute this command on all nodes of a static SRLSP.

A prefix segment must use the next hop or output interface of the optimal route to the destination address of the prefix segment. You can configure multiple prefix segments to the destination address for load sharing if the optimal route has more than one next hops or output interfaces. To avoid configuration failure, make sure all prefix segments use the same prefix segment name, and incoming label.

If you specify only the prefix-path-name argument, the undo static-sr-mpls prefix command deletes all prefix segments with the specified name. If you specify all parameters, only the prefix segment that matches the specified name, destination IP address, and next hop or output interface is deleted.

Examples

# Configure a prefix segment named prefix1. Set the destination IP address, incoming label, outgoing label, and next hop to 2.2.2.2, 16000, 16001, and 10.0.0.2, respectively.

<Sysname> system-view

[Sysname] static-sr-mpls prefix prefix1 destination 2.2.2.2 32 in-label 16000 nexthop 10.0.0.2 out-label 16001

Related commands

display mpls static-sr-mpls prefix

09-MPLS Command Reference

display bgp egress-engineering ipv4

fast-reroute microloop-avoidance rib-update-delay

fast-reroute ti-lfa

mpls te static-sr-mpls

segment-routing adjacency enable

segment-routing mpls

static-sr-mpls lsp

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