Vrrp Tracking Example - Alcatel OmniSwitch 6800 Series Network Configuration Manual

VRRP Application Example

VRRP Tracking Example

The figure below shows two VRRP routers with two virtual routers backing up one IP address on each
VRRP router respectively. Virtual router 1 serves as the default gateway on OmniSwitch A for clients 1
and 2 through IP address 10.10.2.250. For example, if the port that provides access to the Internet on
OmniSwitch A fails, virtual router 1 will continue to be the default router for clients 1 and 2 but clients 1
and 2 will not be able to access the Internet.
port 3/1
10.10.2.210
VLAN 5
clients 1 and 2
default gateway 10.10.2.250
In this example, the master for virtual router 1 has a priority of 100 and the backup for virtual router 1 has
a priority of 75. The virtual router configuration for VRID 1 on VRRP router A is as follows:
-> vrrp 1 5 priority 100
The virtual router configuration for VRID 1 on VRRP router B is as follows:
-> vrrp 1 5 priority 75 preempt
To ensure workstation clients 1 and 2 have connectivity to the internet, configure a tracking policy on
VRRP router A to monitor port 3/1 and associate the policy with VRID 1.
-> vrrp track 1 enable priority 50 port 3/1
-> vrrp 1 5 track-association 1
If port 3/1 on VRRP router A goes down, the master for virtual router A is still functioning but worksta-
tion clients 1 and 2 will not be able to get to the Internet. With this tracking policy enabled, however,
master router 1's priority will be temporarily decremented to 50, allowing backup router 1 to take over and
provide connectivity for those workstations. When port 3/1 on VRRP router A comes back up, master 1
will take over again.
page 16-18
VRRP Router
OmniSwitch A
VRID 1
Master 1
10.10.2.250
VRID 2
Backup 2
10.10.2.245
VRRP Tracking Example
OmniSwitch 6800 Series Network Configuration Guide
VRRP Router
OmniSwitch B
Backup 1
Master 2
10.10.2.215
clients 3 and 4
default gateway 10.10.2.245
Configuring VRRP
port 3/1
Virtual Routers
November 2004