Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 610)

The milliseconds variable can be 100 milliseconds interval only. The default is 1000 milliseconds, and
the range is 100 to 40900 milliseconds.
To change the Hello interval on the Master to 200 milliseconds for IPv4 VRRPv3, enter the following
commands.
Router1(config)# interface ethernet 1/6
Router1(config-if-1/6)# ipv6 vrrp vrid 1
Router1(config-if-1/6-vrid-1)# hello-interval msec 200
Syntax: [no] hello-interval msec milliseconds
IPv4 VRRPv2 supports the hello-interval configuration in seconds, while IPv6 VRRP supports this
configuration in milliseconds; both use the CLI hello-interval xxx. However IPv4 VRRPv3 supports
both the seconds and milliseconds configuration using the hello-interval xxx and hello-interval msec
xxx commands respectively.
Dead interval configuration
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 configured, 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 1/5
device Router2(config-if-e1000-1/5)#ip vrrp vrid 1
device Router2(config-if-e1000-1/5-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 configured, 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 1/6
device(config-if-1/6)#ip vrrp vrid 1
device(config-if-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
Dead interval configuration
610 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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