Brocade BigIron RX Series Configuration Guide - Manual (Page 539)

BigIron RX Series Configuration Guide 461
53-1002484-04
Overview of VRRPE
17
• VRRPE reduces the priority of a VRRPE interface by the amount of a tracked interface’s
priority if the tracked interface’s link goes down. For example, if the VRRPE interface’s
priority is 200 and a tracked interface with track priority 20 goes down, the software
changes the VRRPE interface’s priority to 180. If another tracked interface goes down, the
software reduces the VRID’s priority again, by the amount of the tracked interface’s track
priority.
The most important difference is that all VRRPE routers are Backups. There is no Owner router.
VRRPE overcomes the limitations in standard VRRP by removing the Owner.
Figure 86 shows an example of a VRRPE configuration.
FIGURE 86 Router1 and Router2 are configured to provide dual redundant network access for the
host
In this example, Router1 and Router2 use VRRPE to load share as well as provide redundancy to
the hosts. The load sharing is accomplished by creating two VRRPE groups. Each group has its
own virtual IP addresses. Half of the clients point to VRID 1's virtual IP address as their default
gateway and the other half point to VRID 2's virtual IP address as their default gateway. This will
enable some of the outbound Internet traffic to go through Router1 and the rest to go through
Router2.
Router1 is the master for VRID 1 (backup priority = 110) and Router2 is the backup for VRID 1
(backup priority = 100). Router1 and Router2 both track the uplinks to the Internet. If an uplink
failure occurs on Router1, its backup priority is decremented by 20 (track priority = 20), so that all
traffic destined to the Internet is sent through Router2 instead.
Internet
Router1 Router2
e 2/4
e 1/6 192.53.5.2 192.53.5.3 e 5/1
e 3/2
Host1
Default Gateway
192.53.5.254 Host2
Default Gateway
192.53.5.254 Host3
Default Gateway
192.53.5.253 Host4
Default Gateway
192.53.5.253
VRID 1
Router A = Master
Virtual IP address 192.53.5.254
Priority = 110
Track port = e 2/4
Track priority = 20
VRID 2
Router A = Backup
Virtual IP address 192.53.5.253
Priority = 100 (Default)
Track Port = e 2/4
Track Priority = 20
VRID 1
Router B = Backup
Virtual IP address 192.53.5.254
Priority = 100 (Default)
Track port = e 3/2
Track priority = 20
VRID 2
Router A = Master
Virtual IP address 192.53.5.253
Priority = 110
Track Port = e 3/2
Track Priority = 20