5.1. VRRP Over Ethernet
Over Ethernet, VRRP routers use a common MAC address of the format 00:00:5E: 00:01:XX. The first three octets are derived from the IANA's OUI. The next two octets (00:01) indicate the address block assigned to the VRRP protocol by IANA. The last octet is the VRID or the VRRP virtual router or group identifier, which provides for 255 virtual routers in a network.
Figure 5-1 shows two physical routers, R1 and R2. R1 has IP address 192.32. 15.1 / MAC of 00:00:A2:0B:00:01, backed up by R2, which has IP address 192.32. 15.2/ MAC of 00:00:A2:BE:D0:03. R1 is backing up R2. Therefore, there are two virtual routers in this picture: virtual router V1 with IP address IP(V1)=192.32.15.1, VRID of 37, and virtual router V2 with IP address ...
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