Enterasys Networks X-Pedition XSR CLI - Manual (Page 272)

Virtual Router Redundancy Protocol Commands
5-196 Configuring the Internet Protocol
vrrp track
This command allows a Virtual Router (VR) to track another interface (FastEthernet, Serial, Dialer
or Multilink PPP) or one or moe routes on the same router.
When interface A is configured to track interface B, interface A will monitor the status of interface
B to decide if it wants to become the master of a VR. When interface B goes down, it will lower its
priority to 0 (zero) and refrain from participating in the VR master selection. but will continue to
monitor interface B. When interface B comes up, interface A will increase its VR priority back to
the original value. If interface A is originally configured as a backup VR, no preemption will
occur, but interface A will resume being the backup VR.
This command should be used on the interface that is most likely to be selected as master of the
corresponding VR. If the interface is configured as a backup VR, the command has no effect.
When you configure watchlist tracking, if all routes fail, the VR will lower its priority to 0 and
when at least one of the routes come up, the VR will return to its original priority. When
specifying a watch‐group, be aware that you can use the associated
dialer watch-list
command.
Syntax of the “no” Form
vrrp <group> track <interface-type> watch-group watch-list-number
Syntax of the “no” Form
The no form of this command disables the functionality:
no vrrp group track
Defaults
• No interface tracking.
• If no group is provided, the default group is 1.
Mode
Interface configuration: XSR(config-if<xx>)#
Example
This example enables the tracking of interface Serial 1/0 by interface F1 on VR 2:
Notes: This command should be used on the interface most likely to be chosen master of the
corresponding VR. The command has no effect if the interface is configured as a backup VR.
The XSR supports one track interface per VR only, so every time it is configured, the router will
overwrite the previous one.
Caution: When you configure the track interface, the VR IP address you specify must be different
than the physical IP address of the interface otherwise client ARP tables will not be correctly
updated.
group VR group number, ranging from 1 to 255.
interface-type Name and number of the interface to monitor.
watch-list-number Number of the Dialer watch‐list to monitor, ranging from 1 to 255.