Version 6.8 17 Mediant MSBR
Configuration Guide 4. VRRP
4 VRRP
VRRP provides for automatic assignment of available routers to participating hosts. This
increases the availability and reliability of routing paths via automatic default gateway
selections on a LAN.
The protocol achieves this by creating virtual routers, comprised of master and backup
routers. VRRP routers use multicast to notify its presence in the LAN (never forwarding
outside of the LAN).
VRRP is based on RFC 2338 and RFC 3768.
4.1 Feature Key
Advanced routing feature key must be enabled.
4.2 CLI Configuration and Status Commands
The following describes the CLI Configuration and Status commands.
4.2.1 Configuration Commands
Command Description
Enters the data configuration menu.
(config-data)# interface
<Interface>
vrrp <VRID> ip <ip address>
Sets primary IP address for the VRID
vrrp <VRID> ip <ip address>
secondary
Sets secondary IP address for the VRID
vrrp <VRID> priority <priority>
Sets priority for VRID, range 1-254
Sets preemption for lower priority Master
vrrp <VRID> advertisement-timer
<time in seconds>
Sets interval timer for advertising the Master
VRID
4.2.2 Status Commands
Command Description
show data vrrp interface
<interface name>
Displays vrrp interface status.
Displays vrrp brief status
# show data vrrp
VLAN 1 - Group 1
State is Master
Virtual IP address is 10.4.6.14
Advertisement interval is 1 sec
Preemption is enabled