To congure interface 1/1/6 on Router 1 to track interface 1/2/4, enter the following commands.
Router1(config)# interface ethernet 1/1/6
Router1(config-if-1/1/6)# ip vrrp vrid 1
Router1(config-if-1/1/6-vrid-1)# track-port ethernet 1/2/4
Syntax: track-port ethernet [ unitnum/slotnum/portnum | ve num ]
The syntax is the same for VRRP and VRRP-E.
Track priority
conguration
NOTE
Track priority is not supported by IPv6 VRRP v3.
When you congure a VRID to track the link state of other interfaces, and one of the tracked interfaces goes down, the software changes
the VRRP or VRRP-E priority of the VRID interface:
• For VRRP, the software changes the priority of the VRID to the track priority, which typically is lower than the VRID priority and
lower than the VRID priorities congured on the Backups. For example, if the VRRP interface priority is 100 and a tracked
interface with track priority 60 goes down, the software changes the VRRP interface priority to 60.
• For VRRP-E, the software reduces the VRID priority by the amount of the priority of the tracked interface that went down. For
example, if the VRRP-E interface priority is 100 and a tracked interface with track priority 60 goes down, the software changes
the VRRP-E interface priority to 40. If another tracked interface goes down, the software reduces the VRID priority again, by the
amount of the tracked interface track priority.
The default track priority for an Owner for VRRP v2, IPv6 VRRP v3 and for IPv4 VRRP-E and IPv6 VRRP-E, the default track priority is
5. The default track priority for Backup routers is 1.
You enter the track priority value with the owner or backup command.
Syntax: owner [ track-priority value ]
Syntax: backup [ priority value ] [ track-priorityvalue ]
The syntax is the same for VRRP and VRRP-E.
Backup preempt conguration
By default, a Backup that has a higher priority than another Backup that has become the Master can preempt the Master, and take over
the role of Master. If you want to prevent this behavior, disable preemption.
Preemption applies only to Backups and takes eect only when the Master has failed and a Backup has assumed ownership of the
VRID. The feature prevents a Backup with a higher priority from taking over as Master from another Backup that has a lower priority but
has already become the Master of the VRID.
Preemption is especially useful for preventing apping in situations where there are multiple Backups and a Backup with a lower priority
than another Backup has assumed ownership, because the Backup with the higher priority was unavailable when ownership changed.
If you enable the non-preempt mode (thus disabling the preemption feature) on all the Backups, the Backup that becomes the Master
following the disappearance of the Master continues to be the Master. The new Master is not preempted.
NOTE
In VRRP, regardless of the setting for the preempt parameter, the Owner always becomes the Master again when it comes back
online.
Additional VRRP and VRRP-E parameter conguration
FastIron Ethernet Switch Layer 3 Routing
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