Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - Page 517

Overview of VRRPE 17 • Track ports and track priority: • 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 Internet 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 e 2/4 Router1 e 1/6 192.53.5.2 e 3/2 Router2 e 5/1 192.53.5.3 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 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 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. BigIron RX Series Configuration Guide 445 53-1001810-01