Configuring VRRP and VRRPE

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 12.3 shows an example of a VRRPE configuration.

Internet or

enterprise Intranet

e 2/4

VRID1

Router1 = Master

Internet or

enterprise Intranet

e 3/2

VRID1

Router2 = Backup

Virtual

e 1/6 192.53.5.2

192.53.5.3 e 1/5

Virtual

IP address = 192.53.5.254

MAC address = 00-E0-52-AA-BB-01 Priority = 200

Track port = e 2/4 Track priority = 20

IP address = 192.53.5.254

MAC address = 00-00-5E-AA-BB-01 Priority = 100

Track port = e 3/2

Track priority = 19

Host1

Default Gateway 192.53.5.254

Figure 12.3 Router1 and Router2 are configured as a VRRPE virtual router to provide redundant network access for Host1

This configuration is similar to the one shown in Figure 12.2 on page 12-3.The differences between the two configurations are based on the architectural differences between VRRP and VRRPE:

•The virtual IP address is not a real IP address configured on one of the VRID interfaces. In Figure 12.2 on page 12-3,the virtual IP address is also a real IP address configured on port 1/6 on the router on the left, which automatically makes the router the Owner of the virtual IP address and gives the router priority 255 for the VRID.

•The VRID MAC address has the format 02-E0-52-<hash-value>-<vrid>, where <hash-value> is a two-octet hashed value for the IP address and <vrid> is the VRID.

•The priority for the router on the right is 100, which is the default priority for Backups in VRRP and VRRPE. However, the priority for the router on the left is 200. In this case, the priority has been changed during configuration from the default value to 200. In Figure 12.2 on page 12-3,the router on the left has priority 255, the default priority for the Owner of the real IP address shared by the virtual IP address. In VRRPE, none of the VRID interfaces are configured with a real IP address that is the same as the virtual IP interface.

The other parameters are the same.

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