Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 808)

780 Multi-Service IronWare Routing Configuration Guide
53-1003033-02
Overview of VRRP
interface 1/1
state master
administrative-status enabled
mode non-owner(backup)
virtual mac dddd.eeee.ffff (configured)
priority 100
current priority 100
track-priority 5
hello-interval 1 sec
backup hello-interval 60 sec
advertise backup disabled
dead-interval 0 ms
preempt-mode true
virtual ipv6 address 10:20:1::100
You can also identify configured virtual MAC addresses by entering the show running-config
command, as shown in the following example.
Brocade# show running-config interface ethernet 1/11
interface ethernet 1/11
enable
ip ospf area 0
ip address 1.1.1.15/24
Syntax: show running-config interface slot/port
Track ports and track priority
Brocade enhanced VRRP by giving a VRRP router the capability to monitor the state of the
interfaces on the other end of the route path through the router. For example, in
Figure 40 on
page 776, interface e1/6 on Router1 owns the IP address to which Host1 directs route traffic on its
default gateway. The exit path for this traffic is through Router1’s e2/4 interface.
Suppose interface e2/4 goes down. Even if interface e1/6 is still up, Host1 is cut off from other
networks. In conventional VRRP, Router1 would continue to be the Master router despite the
unavailability of the exit interface for the path the router is supporting. However, if you configure
interface e1/6 to track the state of interface e2/4, if e2/4 goes down, interface e1/6 responds by
changing Router1’s VRRP priority to the value of the track priority. In the configuration shown in
Figure 40 on page 776, Router1’s priority changes from 255 to 20. One of the parameters
contained in the Hello messages the Master router sends to its Backup routers is the Master
router’s priority. If the track port feature results in a change in the Master router’s priority, the
Backup routers quickly become aware of the change and initiate a negotiation for Master router.
In Figure 40 on page 776, the track priority results in Router1’s VRRP priority becoming lower than
Router2’s VRRP priority. As a result, when Router2 learns that it now has a higher priority than
Router1, Router2 initiates negotiation for Master router and becomes the new Master router, thus
providing an open path for Host1’s traffic. To take advantage of the track port feature, make sure
the track priorities are always lower than the VRRP priorities. The default track priority for the router
that owns the VRID IP addresses is 2. The default track priority for Backup routers is 1. If you
change the track port priorities, make sure you assign a higher track priority to the Owner of the IP
addresses than the track priority you assign on the Backup routers.