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• Routers on which the timer settings have not been configured can learn
the current timer values from the master or standby router. Timers
configured on the master router always override any other timer
settings. All routers in an HSRP group should be configured with the
same timer values.
• If the master router stops sending advertisements, backup routers will
bid to become the master based on priority. The hold time before
declaring a router dead should be normally be set to a value 3 times or
more than the hello time.
• HSRP advertisements are sent to the multicast address 224.0.0.2. Using
a multicast address reduces the amount of traffic that has to processed
by network devices that are not part of the designated HSRP group.
Example
This example sets the timers for group 1 to 6 seconds for the hello time,
and 18 seconds for the hold time.
standby track
Use this command to configure an interface so that the HSRP priority
changes based on the availability of other IP interfaces on this router. Use
the no form to disable tracking.
Syntax
standby [group] track vlan vlan-id [interface-priority]
no standby [group] track vlan vlan-id
• group - Identifies the HSRP group. (Range: 0-255)
• vlan-id - VLAN configured with an IP address. (Range: 1-4094)
• interface-priority - Amount by which the HSRP router priority is
decremented (or incremented) when the interface goes down (or
comes back up). (Range: 1-255)
Console(config-if)#standby 1 timers 6 18
Console(config-if)#