BROCADE IP PRIMER

Chapter 14: Security, Redundancy and MoreVRRP vs. VRRP-ExtendedThere is another flavor of VRRP available. It is Virtual Router Redundancy Protocol-Extended(VRRP-E). This protocol adds several features to VRRP.• Ping. In VRRP, you cannot ping the virtual address. In VRRP-E, you can.• Owner/Backup. In VRRP, you configure one router to be the “owner” andall others to be a backup. In VRRP-E, all routers are backup, and an electionis held to decide who is the master (not “owner”). This allows greaterflexibility over who is master.• IP Address. In VRRP, the virtual address must be the same physicaladdress as the owner's interface. In VRRP-E, the address may be anyaddress in the same subnet.• Hello Packets. In VRRP, hello packets are sent to 224.0.0.18. In VRRP-E,hello packets are encapsulated in UDP port 8888 and sent to 224.0.0.2(“all routers” multicast address).• Track Priority. In VRRP, a failure causes the router to assume the value ofthe track-priority configured. In VRRP-E, a failure causes the router's priorityto be deducted by the track-priority. For example, if a router wereconfigured with a priority of 100 (default), and a track-priority of 10, a failurewould cause the router's priority to become 90 (100 - 10 = 90).Configuring VRRP-ExtendedLet's see how our previous example would look using VRRP-E:BR-RouterA#conf tBR-RouterA(config)#router vrrp-extendedBR-RouterA(config-vrrpe-router)#exitBR-RouterA(config)#int e 1BR-RouterA(config-if-e1000-1)#ip address 10.1.1.11/24BR-RouterA(config-if-e1000-1)#ip vrrp-extended vrid 1BR-RouterA(config-if-e1000-1-vrid-1)#backup priority 160track-priority 20BR-RouterA(config-if-e1000-1-vrid-1)#track-port e 4BR-RouterA(config-if-e1000-1-vrid-1)#ip-address 10.1.1.1BR-RouterA(config-if-e1000-1-vrid-1)#activateNotice that we gave it a different virtual address? We gave it “10.1.1.1.” Wedidn't specify a subnet mask. This is because we cannot assign a virtualaddress outside of the interface's own subnet. We've given it a priority of 160with a track-priority of 20. This means that a failure will cause its priority todrop to 140. The advantage of the deducting track priority is that we can trackseveral links. Each link will bring a deduction in the router's priority, but it may,or may not failover the virtual address. It all depends on who has the higherpriority.314 Brocade IP Primer