track { ip-link | bfd-session } (PBR rule view)

Function

The track { ip-link | bfd-session } command configures the interworking between the PBR rule and IP-link or BFD. The IP link or BFD status determines the validity of the PBR rule.

The undo track { ip-link | bfd-session } command deletes the configuration.

Format

track { ip-link link-name | bfd-session local-discr-value }

undo track { ip-link | bfd-session }

Parameters

Parameter	Description	Value
link-name	Specifies the name of the IP link.	The value must be the name of an existing IP link.
local-discr-value	Specifies the local discriminator of a monitored BFD session.	The value must be the local discriminator of an existing BFD session.

Views

PBR rule view

Default Level

2: Configuration level

Usage Guidelines

PBR cannot detect the reachability of the next hop. If the next hop is unreachable, the device forwards the packet to the next hop based on the PBR rule, which may result in packet loss.

You can configure the interworking between the PBR rule and IP link or BFD to resolve this problem. When you configure IP-link or BFD, ensure that the destination IP address of the monitored link is the same as the specified next hop, and run the track { ip-link | bfd-session } command to associate PBR rules with IP links or BFD. IP link or BFD monitors the reachability of the links of the next hop and determines the validity of PBR rules based on the IP link status or BFD status.

When an IP link or BFD is Up, the link is reachable, and PBR is valid to guide traffic forwarding.
When an IP link or BFD is Down, the link is unreachable, and PBR is invalid. Packets are forwarded based on the routing table.

Example

# Configure the interworking between PBR rule abc and IP link test to allow the IP link status to determine the validity of PBR rule abc.

<sysname> system-view
[sysname] policy-based-route
[sysname-policy-pbr] rule name abc
[sysname-policy-pbr-rule-abc] track ip-link test

# Configure the interworking between PBR rule test and the local discriminator of BFD session 5 to allow the BFD status to determine the validity of PBR rule test.

<sysname> system-view
[sysname] policy-based-route
[sysname-policy-pbr] rule name test
[sysname-policy-pbr-rule-test] track bfd-session 5