Dead interval conguration
The dead interval is the number of seconds a Backup router waits for a Hello message from the Master before determining that the
Master is dead. When Backup routers determine that the Master is dead, the Backup with the highest priority becomes the new Master.
If the value for the dead interval is not congured, then the current dead interval is equal to three times the Hello interval plus the Skew
time (where Skew time is equal to (256 - priority) divided by 256).
To change the dead interval on a Backup to 30 seconds, enter the following commands.
device Router2(config)#interface ethernet 1/1/5
device Router2(config-if-e1000-1/1/5)#ip vrrp vrid 1
device Router2(config-if-e1000-1/1/5-vrid-1)#dead-interval 30
Syntax: dead-interval value
The value variable is from 1 through 84 seconds for VRRP v2 and VRRP-E v2. For other versions, the value variable is from 100
through 8400 milliseconds. The default is 3600 milliseconds.
NOTE
If the dead-interval command is not congured, then a zero value is displayed in the output of the show ip vrrp or show ipv6
vrrp-extended command.
Backup Hello message state and interval
By default, Backup routers do not send Hello messages to advertise themselves to the Master. You can enable these messages if
desired and also change the message interval.
To enable a Backup router to send Hello messages to the Master, enter the following commands.
device(config)# router vrrp
device(config)# interface ethernet 1/1/6
device(config-if-1/1/6)# ip vrrp vrid 1
device(config-if-1/1/6-vrid-1)# advertise backup
Syntax: [no] advertise backup
When you enable a Backup to send Hello messages, the Backup sends a Hello message to the Master every 60 seconds by default.
You can change the interval to be up to 3600 seconds. To change the Hello message interval, enter the following commands.
device(config)# router vrrp
device(config)# interface ethernet 1/1/6
device(config-if-1/1/6)# ip vrrp vrid 1
device(config-if-1/1/6-vrid-1)# backup-hello-interval 180
Syntax: [no] backup-hello-interval num
The num variable
species the message interval and can be from 60 through 3600 seconds. The default is 60 seconds.
The syntax is the same for VRRP v2 and IPv6 VRRP v3, and VRRP-E v2 and IPv6 VRRP-E v3.
Track port conguration
NOTE
Track port is not supported by IPv6 VRRPv3 owner.
You can congure the VRID on one interface to track the link state of another interface on the Layer 3 switch. This capability is quite
useful for tracking the state of the exit interface for the path for which the VRID is providing redundancy.
Additional VRRP and VRRP-E parameter conguration
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 533
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