Dell Brocade DCX, Configuration Manual

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BigIron RX Series Configuration Guide 445
53-1001810-01
Overview of VRRPE
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Track ports and track priority:
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VRRP changes the priority of the VRID to the track priority, which typically is lower than the
VRID priority and lower than the VRID’s priorities configured on the Backups. For example,
if the VRRP interface’s priority is 100 and a tracked interface with track priority 20 goes
down, the software changes the VRRP interface’s priority to 20.
•
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 85 shows an example of a VRRPE configuration.
FIGURE 85 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.
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