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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.
VRID1
Internet
or
enterprise Intranet
e 3/2
192.53.5.3
e 1/6
e 1/5
e 2/4
Internet
or
enterprise Intranet
MAC address =
00-E0-52-AA-BB-01
Track port = e 2/4
Track priority = 20
Router1 = Master
Priority = 200
Virtual
IP address = 192.53.5.254
VRID1
MAC address = 00-00-5E-AA-BB-01
Track port = e 3/2
Track priority = 19
Router2 = Backup
Priority = 100
Virtual
IP address = 192.53.5.254
192.53.5.2
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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