Contents

Basic IP forwarding commands· 1

display fib· 1

display fib usage· 3

forwarding vxlan-packet inner-protocol 3

ip forwarding-table save· 4

snmp-agent trap enable fib· 5

Load sharing commands· 7

display ip load-sharing mode· 7

display ip load-sharing mode per-packet interface· 8

display ip load-sharing path· 8

ip load-sharing local-first enable· 10

ip load-sharing mode· 11

ip load-sharing mode per-packet 13

ip load-sharing symmetric enable· 13

 

Basic IP forwarding commands

display fib

Use display fib to display FIB entries.

Syntax

display fib [ vpn-instance vpn-instance-name ] [ ip-address [ mask | mask-length ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To display the FIB entries for the public network, do not specify any VPN instance.

ip-address: Displays the FIB entry that matches the specified destination IP address.

mask: Specifies the mask for the IP address.

mask-length: Specifies the mask length for the IP address. The value range is 0 to 32.

Usage guidelines

If you specify an IP address without a mask or mask length, this command displays the longest matching FIB entry.

If you specify an IP address and a mask or mask length, this command displays the exactly matching FIB entry.

Examples

# Display all FIB entries of the public network.

<Sysname> display fib

 

Destination count: 5 FIB entry count: 5

 

Flag:

  U:Usable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

1.1.1.0/24         192.168.126.1   USGF     M-GE0/0/0                Null

127.0.0.0/8        127.0.0.1       U        InLoop0                  Null

127.0.0.0/32       127.0.0.1       UH       InLoop0                  Null

127.0.0.1/32       127.0.0.1       UH       InLoop0                  Null

# Display the FIB entries for VPN vpn1.

<Sysname> display fib vpn-instance vpn1

Destination count: 6 FIB entry count: 6

 

Flag:

  U:Usable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token      Label

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

20.20.20.0/24      20.20.20.25     U        M-GE0/0/0                Null

20.20.20.0/32      20.20.20.25     UBH      M-GE0/0/0                Null

20.20.20.25/32     127.0.0.1       UH       InLoop0                  Null

20.20.20.25/32     20.20.20.25     H        M-GE0/0/0                Null

20.20.20.255/32    20.20.20.25     UBH      M-GE0/0/0                Null

# Display the FIB entries matching the destination IP address 10.2.1.1.

<Sysname> display fib 10.2.1.1

 

Destination count: 1 FIB entry count: 1

 

Flag:

  U:Usable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

10.2.1.1/32        127.0.0.1       UH       InLoop0                  Null

Table 1 Command output

Field	Description
Destination count	Total number of destination addresses.
FIB entry count	Total number of FIB entries.
Destination/Mask	Destination address and the mask length.
Nexthop	Next hop address.
Flag	Flags of routes: ·     U—Usable route. ·     G—Gateway route. ·     H—Host route. ·     B—Blackhole route. ·     D—Dynamic route. ·     S—Static route. ·     R—Relay route. ·     F—Fast reroute.
OutInterface/Token	Output interface/LSP index number.
Label	Inner label.

 

display fib usage

Use display fib usage to display FIB table usage information.

Syntax

display fib usage

Views

Any view

Predefined user roles

network-admin

network-operator

Usage guidelines

You can view FIB table usage information collected during the most recent hour.

When the device calculates the FIB table usage, it excludes the FIB entries deployed by ARP host routes from calculation.

The device counts multiple FIB entries as one FIB entry if they are deployed by equal-cost routes that have the same destination IP address and different next hops.

Examples

# Display FIB table usage information.

<Sysname> display fib usage

FIB table upper limit: 65000

  Time          FIB count   Usage

  Current       52000       80%

  1 min ago     51351       79%

  2 min ago     50711       78%

  3 min ago     47748       77%

  …

  59 min ago    13656       21%

  60 min ago    13007       20%

Table 2 Command output

Field	Description
FIB table upper limit	Maximum number of entries supported by the FIB table.
Time	Time when the FIB table usage was recorded.
FIB count	Number of real-time FIB entries.
Usage	FIB table usage, which is the ratio of the real-time FIB entry count to the FIB entry count limit.

 

forwarding vxlan-packet inner-protocol

Use forwarding vxlan-packet inner-protocol to enable hardware forwarding for specific packets received from VXLAN tunnels.

Use undo forwarding vxlan-packet inner-protocol to restore the default.

Syntax

forwarding vxlan-packet inner-protocol { ipv4 | ipv6 } *

undo forwarding vxlan-packet inner-protocol [ ipv4 | ipv6 ]

Default

Packets received from VXLAN tunnels are delivered to the CPU for processing.

Views

System view

Predefined user roles

network-admin

Parameters

ipv4: Specifies IPv4 packets.

ipv6: Specifies IPv6 packets.

Usage guidelines

By default, the device forwards packets received from VXLAN tunnels to the CPU for processing when acting as a VTEP in a distributed EVPN gateway network. If a large number of packets are received, packet loss might occur because of software rate limit, which might cause service exceptions on downlink devices.

To resolve this issue, you can enable the device to forward specific packets received from VXLAN tunnels in hardware without delivering them to the CPU.

Examples

# Enable hardware forwarding for IPv4 packets received from VXLAN tunnels.

<Sysname> system-view

[Sysname] forwarding vxlan-packet inner-protocol ipv4

ip forwarding-table save

Use ip forwarding-table save to save the IP forwarding entries to a file.

Syntax

ip forwarding-table save filename filename

Views

Any view

Predefined user roles

network-admin

Parameters

filename filename: Specifies the name of a file, a string of 1 to 255 characters. For information about the filename argument, see file system management in Fundamentals Configuration Guide.

Usage guidelines

The command automatically creates the file if you specify a nonexistent file. If the file already exists, this command overwrites the file content.

To automatically save the IP forwarding entries periodically, configure a schedule for the device to automatically run the ip forwarding-table save command. For information about scheduling a task, see Fundamentals Configuration Guide.

Examples

# Save the IP forwarding entries to the fib.txt file.

<Sysname> ip forwarding-table save filename fib.txt

snmp-agent trap enable fib

Use snmp-agent trap enable fib to enable SNMP notifications for FIB events.

Use undo snmp-agent trap enable fib to disable SNMP notifications for FIB events.

Syntax

snmp-agent trap enable fib [ deliver-failed | ecmp-limit | entry-consistency | entry-limit ] *

undo snmp-agent trap enable fib [ deliver-failed | ecmp-limit | entry-consistency | entry-limit ] *

Default

SNMP notifications for FIB events are enabled.

Views

System view

Predefined user roles

network-admin

Parameters

deliver-failed: Specifies notifications to be sent when FIB entry deployment to the hardware fails.

ecmp-limit: Specifies notifications to be sent when the number of ECMP routes exceeds the upper limit.

entry-consistency: Specifies notifications to be sent when the FIB software and hardware entries are inconsistent.

entry-limit: Specifies notifications to be sent when the number of FIB entries exceeds the upper limit.

Usage guidelines

This feature enables the FIB module to generate SNMP notifications for critical FIB events. The SNMP notifications are sent to the SNMP module.

You can enable specific SNMP notifications for FIB events as needed. If you do not specify any SNMP notification types, the command enables all types of SNMP notifications.

·     With ecmp-limit specified, when the number of ECMP routes learned by a device exceeds the upper limit, the device sends an SNMP notification that carries the module number to the SNMP module.

·     With entry-consistency specified, if the FIB software and hardware entries on a module are inconsistent, the device sends an SNMP notification that carries the module number to the SNMP module.

·     With entry-limit specified, when the number of FIB entries exceeds the upper limit, the device sends an SNMP notification that carries the FIB entry module name to the SNMP module.

·     With deliver-failed specified, when FIB entry deployment to the hardware fails, the device sends an SNMP notification that carries the entry VRF, IP address type, IP address, mask, and failure reason to the SNMP module.

For the SNMP notifications to be sent correctly, you must also configure SNMP. For more information about SNMP configuration, see Network Management and Monitoring Configuration Guide.

Examples

# Disable SNMP notifications for FIB events.

<Sysname> system-view

[Sysname] undo snmp-agent trap enable fib

 

Load sharing commands

display ip load-sharing mode

Use display ip load-sharing mode to display the load sharing mode in use.

Syntax

display ip load-sharing mode slot slot-number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays the load sharing mode for all member devices.

Examples

# Display the load sharing mode in use.

<Sysname> display ip load-sharing mode slot 1

Load-sharing mode: per-flow

Load-sharing options: dest-ip | src-ip | ip-pro | dest-port | src-port | ingress-port

Load-sharing algorithm: 1

IP tunnel load-sharing mode: outer

Table 3 Command output

Field	Description
Load-sharing mode	The load sharing mode in use: ·     per-packet—Per-packet load sharing. ·     per-flow—Per-flow load sharing.
Load-sharing options	Options configured for load sharing: ·     dest-ip—Identifies flows by packet's destination IP address. ·     src-ip—Identifies flows by packet's source IP address. ·     ip-pro—Identifies flows by packet's IP protocol. ·     dest-port—Identifies flows by packet's destination port number. ·     src-port—Identifies flows by packet's source port number. ·     ingress-port—Identifies flows by packet's ingress port.
Load-sharing algorithm	Algorithm used by load sharing.
IP tunnel load-sharing mode	Load sharing for IP tunnel packets: ·     inner—Identifies flows by inner IP header information. ·     outer—Identifies flows by outer IP header information.

 

Related commands

ip load-sharing mode

display ip load-sharing mode per-packet interface

Use display ip load-sharing mode per-packet interface to display information about interfaces enabled with per-packet load sharing.

Syntax

display ip load-sharing mode per-packet interface

Views

Any view

Predefined user roles

network-admin

network-operator

Usage guidelines

Use this command to display information about interfaces configured with the ip load-sharing mode per-packet command.

Examples

# Display information about interfaces enabled with per-packet load sharing.

<Sysname> display ip load-sharing mode per-packet interface

 

Count: 3

Interface                                  Status

Ten-GigabitEthernet1/0/1                   failed

Route-Aggregation1                         succeed

Route-Aggregation2.1                       failed

Table 4 Command output

Field	Description
Count	Number of interfaces enabled with per-packet load sharing.
Interface	Interface name.
Status	Whether per-packet load sharing is enabled successfully on the interface: ·     succeed. ·     failed.

 

Related commands

ip load-sharing mode per-packet

display ip load-sharing path

Use display ip load-sharing path to display the load sharing path selected for a flow.

Syntax

display ip load-sharing path ingress-port interface-type interface-number packet-format { ipv4oe dest-ip ip-address [ src-ip ip-address ] | ipv6oe dest-ipv6 ipv6-address [ src-ipv6 ipv6-address | flow-label flow-label ] } [ dest-port port-id | ip-pro protocol-id | src-port port-id | vpn-instance vpn-instance-name ] *

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ingress-port interface-type interface-number: Specifies an ingress port by its type and number.

packet-format { ipv4oe dest-ip ip-address [src-ip ip-address ] | ipv6oe dest-ipv6 ipv6-address [ src-ipv6 ipv6-address ] }: Specifies the packet encapsulation format.

ipv4oe: Specifies the format of IPv4 over Ethernet.

dest-ip ip-address: Specifies the destination IPv4 address in dotted decimal notation. If you do not specify this argument, the calculation uses 0.0.0.0 for path selection.

src-ip ip-address: Specifies the source IPv4 address in dotted decimal notation. If you do not specify this argument, the calculation uses 0.0.0.0 for path selection.

ipv6oe: Specifies the format of IPv6 over Ethernet.

dest-ipv6 ipv6-address: Specifies the destination IPv6 address. If you do not specify this option, the calculation uses 0:0:0:0:0:0:0:0 for path selection.

src-ipv6 ipv6-address: Specifies the source IPv6 address. If you do not specify this option, the calculation uses 0:0:0:0:0:0:0:0 for path selection.

flow-label flow-label: Specifies the IPv6 flow label in the range of 0 to 1048575. If you do not specify an IPv6 flow label, the device uses 0 for ECMP route selection.

dest-port port-id: Specifies a destination port number in the range of 1 to 65535. If you do not specify this option, the calculation uses 0 for path selection.

ip-pro protocol-id: Specifies an IP protocol by its number in the range of 1 to 65535. If you do not specify this option, the calculation uses 0 for path selection.

source-port port-id: Specifies a source port number in the range of 1 to 65535. If you do not specify this option, the calculation uses 0 for path selection.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To display the path on the public network, do not specify this option.

Usage guidelines

The option settings in this command must match both the options displayed in the display ip load-sharing mode command and the field values in load shared packets. If the option settings do not meet the requirement, the path displayed by this command might be different from the real path for load sharing.

This command cannot display the outgoing interface information and tunnel encapsulation packet information for unknown unicast packets.

Examples

# Display the load sharing path selected for the flow with the following attributes: ingress port Ten-GigabitEthernet 1/0/3, destination IP address 10.110.0.2, source IP address 10.100.0.2, IP protocol number 153, destination port number 2000, source port number 2000.

<Sysname> display ip load-sharing path ingress-port ten-gigabitethernet 1/0/3 packet-format ipv4oe dest-ip 10.110.0.2 src-ip 10.100.0.2 ip-pro 153 dest-port 2000 src-port 2000

 

Load-sharing algorithm: 0

Load-sharing options: dest-ip | src-ip | ip-pro | dest-port | src-port | ingress-port

Load-sharing parameters:

  Missing configured are set to 0.

  ingress-port: Ten-GigabitEthernet1/0/3

  packet-format: IPv4oE

  dest-ip: 10.110.0.2

  src-ip: 10.100.0.2

  ip-pro: 153

  dest-port: 2000

  src-port: 2000

Path selected: 20.0.0.2(interface Ten-GigabitEthernet1/0/3)

Table 5 Command output

Field	Description
Load-sharing algorithm	Load sharing algorithm ID.
Load-sharing options	Load sharing options specified by the ip load-sharing mode command.
Load-sharing parameters	Load sharing parameters that you specify for the display ip load-sharing path command.
Missing configured are set to 0.	Values of the unconfigured parameters are set to 0.
ingress-port	Ingress port of the packet.
packet-format	Packet encapsulation format.
dest-ip	Destination IP address of the packet.
src-ip	Source IP address of the packet.
ip-pro	IP protocol number.
dest-port	Destination port number.
src-port:	Source port number.
flow-label	Flow label.
Path selected	Selected path information, including the IPv4 or IPv6 address of the next hop and the egress port.

 

Related commands

ip load-sharing mode

ip load-sharing local-first enable

Use ip load-sharing local-first enable to enable local-first load sharing.

Use undo ip load-sharing local-first enable to disable local-first load sharing.

Syntax

ip load-sharing local-first enable

undo ip load-sharing local-first enable

Default

Local-first load sharing is enabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Local-first load sharing takes effect only on an IRF fabric.

Examples

# Enable local-first load sharing.

<Sysname> system-view

[Sysname] ip load-sharing local-first enable

ip load-sharing mode

Use ip load-sharing mode to configure the load sharing mode.

Use undo ip load-sharing mode to restore the default.

Syntax

ip load-sharing mode { per-flow [ algorithm algorithm-number [ seed seed-number ] [ shift shift-number ] | [ dest-ip | dest-port | ingress-port | ip-pro | src-ip | src-port ] * | tunnel { inner | outer } ] | per-packet } { global | slot slot-number }

undo ip load-sharing mode [ per-flow tunnel ] { global | slot slot-number }

Default

The device performs per-flow load sharing based on the following criteria: source IP address, destination IP address, source port number, destination port number, IP protocol number, and ingress port.

Views

System view

Predefined user roles

network-admin

Parameters

algorithm algorithm-number: Specifies an algorithm for per-flow load sharing. The value range for the algorithm-number argument is 0 to 13. If you do not specify an algorithm, the algorithm value is set to 0.

seed seed-number: Specifies the seed value for the algorithm. The value range is 0 to ffffffff, and the default value is 0.

shift shift-number: Specifies the shift value for the hash algorithm result. The value range is 0 to 31 and the default value is 0.

per-flow: Implements per-flow load sharing. If you specify none of the dest-ip, dest-port, ingress-port, ip-pro, src-ip, and src-port keywords, the device performs per-flow load sharing based on the following criteria: source IP address, destination IP address, source port number, destination port number, IP protocol number, and ingress port.

dest-ip: Identifies flows by destination IP address.

dest-port: Identifies flows by destination port.

ingress-port: Identifies flows by ingress port.

ip-pro: Identifies flows by protocol number.

src-ip: Identifies flows by source IP address.

src-port: Identifies flows by source port.

tunnel { inner | outer }: Performs per-flow load sharing for IP tunnel packets. The inner keyword identifies flows by inner IP header information. The outer keyword identifies flows by outer IP header information. If you do not specify this option, the device performs per-flow load sharing based on outer IP header information.

global: Configures the load sharing mode globally.

per-packet: Implements per-packet load sharing.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command configures the load sharing mode for all member devices.

Usage guidelines

You can view the default criteria of per-flow load sharing used by the device with the display ip load-sharing mode command.

If traffic is not shared equally, you can use the seed seed-number option and the shift shift-number option to adjust the algorithm result.

The load-sharing hash seed feature does not take effect for unknown unicast packets.

The load-sharing function for IP tunnel packets does not take effect for unknown unicast packets.

The priority of slot-specific load balancing is higher than the global load balancing method. The global configuration takes effect only on slots that are not specified with a load balancing method.

Examples

# Configure per-flow load sharing for slot 1.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow slot 1

# Configure per-flow load sharing based on the destination IP addresses and source IP addresses of packets for slot 1.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow dest-ip src-ip slot 1

# Configure per-flow load sharing based on the inner IP header information of IP tunnel packets for slot 1.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow tunnel inner slot 1

# Configure per-flow load sharing based on algorithm 1 for slot 1.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow algorithm 1 slot 1

Related commands

display ip load-sharing mode

ip load-sharing mode per-packet

Use ip load-sharing mode per-packet to enable per-packet load sharing on an interface and set the load sharing algorithm.

Use undo ip load-sharing mode per-packet to restore the default.

Syntax

ip load-sharing mode per-packet [ robin | spray ]

undo ip load-sharing mode per-packet

Default

No load sharing mode is specified on an interface. The interface uses the load sharing settings configured by using the ip load-sharing mode command in system view.

Views

Layer 3 interface view

Predefined user roles

network-admin

Parameters

robin: Specifies the robin algorithm, an algorithm that considers only the packet quantity.

spray: Specifies the spray algorithm, an algorithm that considers the packet size and distributes the load among a group of ECMP interfaces based on bytes.

Usage guidelines

In scenarios where service traffic and packets are forwarded through fixed interfaces, per-packet load sharing has higher performance than per-flow load sharing. When per-flow load sharing applies globally, you can use this command to enable per-packet load sharing on specific interfaces and set the load sharing algorithm for device performance test purposes. In per-packet load sharing, the robin algorithm does not take the packet size into account, but the spray algorithm takes the size of different packets into account to achieve a more balanced load. If you do not specify an algorithm, the spray algorithm is used by default.

With this command configured, the interfaces do not inherit the load sharing settings of the ip load-sharing mode command in system view.

Examples

# On Ten-GigabitEthernet 1/0/1, enable per-packet load sharing.

<Sysname> system-view

[systerm] interface Ten-GigabitEthernet1/0/1

[systerm-Ten-GigabitEthernet1/0/1] ip load-sharing mode per-packet

ip load-sharing symmetric enable

Use ip load-sharing symmetric enable to enable symmetric load sharing.

Use undo ip load-sharing symmetric enable to disable symmetric load sharing.

Syntax

ip load-sharing symmetric enable

undo ip load-sharing symmetric enable

Default

Symmetric load sharing is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Symmetric load sharing ensures that bidirectional traffic specific to a particular source and destination address pair flow along the same path.

Symmetric load sharing takes effect only on known unicast packets.

Examples

# Enable symmetric load sharing.

<Sysname> system-view

[Sysname] ip load-sharing symmetric enable