A hold timer can be configured on a VRRP-enabled interface to set an interval, in seconds, before a backup device becomes the master VRRP device.
About this task
A hold timer is used when a VRRP-enabled device that was previously a master device failed, but is now back online. The backup device has a higher priority than the current VRRP master device. Before assuming the role of master VRRP device again, the backup device waits for the time period specified in the hold timer. This task is supported in both versions of VRRP and VRRP-E, but the configuration below is for VRRPv3.
Procedure
-
Enter the
configure terminal command to access global configuration mode.
device# configure terminal
-
Enable IPv6 VRRP-E.
device(config)# ipv6 protocol vrrp-extended
In this example, virtual Ethernet (ve) interface configuration mode is entered and the interface is assigned with a VLAN number of 2018.
-
Enter the
interface ve
command with an associated vlan number.
device(config)# interface ve 2018
In this example, virtual Ethernet (ve) interface configuration mode is entered and the interface is assigned with a VLAN number of 2018.
-
Enter an IPv6 address for the interface using the
ipv6 address
command.
device(config-ve-2018)# ipv6 address 2001:2018:8192::122/64
-
Enter the
ipv6 vrrp-group
command with a number to assign a VRRPv3 group to the device.
device(config-ve-2018)# ipv6 vrrp-group 18
In this example, VRRP group configuration mode is entered.
-
Enter the
description
command to enter text that describes the virtual router group.
device(config-vrrp-group-18)# description Product Marketing group
-
Enter the
advertisement-interval command with a number representing milliseconds.
device(config-vrrp-group-18)# advertisement-interval 3000
Note
In VRRPv3, the advertisement-interval is in milliseconds.
-
Enter the
hold-time command with a number representing seconds.
device(config-vrrp-group-18)# hold-time 5
Example
The following example configures and enables a VRRPv3 session and adds a VRRP group description. A hold time of 5 seconds is configured. This example also contains appropriate
virtual-ip command configuration not included in the task above.
device# configure
device(config)# ipv6 protocol vrrp-extended
device(config)# interface ve 2018
device(config-ve-2018)# ipv6 address 2001:2018:8192::122/64
device(config-ve-2018)# ipv6 vrrp-group 18
device(config-vrrp-group-18)# virtual-ip fe80::2018:1
device(config-vrrp-group-18)# virtual-ip 2001:2018:8192::1
device(config-vrrp-group-18)# description Product Marketing group
device(config-vrrp-group-18)# advertisement-interval 3000
device(config-vrrp-group-18)# hold-time 5
