Cisco® CCNP Switch Exam Cram Notes : VRRP

3. Infrastructure Services

3.2 VRRP

Virtual Router Redundancy Protocol (VRRP): VRRP is very similar to HSRP. VRRP is a standards based protocol and defined in RFC 2338. VRRP sends advertisements to multicast destination address 244.0.0.18 using IP protocol.

Given below are the important characteristics of Virtual Router Redundancy Protocol (VRRP):

1. VRRP advertisements are sent at 1-second intervals.

2. VRRP has no mechanism for tracking interfaces to allow more capable routers to take over the master role.

3. Router priorities range from 1 to 254.

4. The default VRRP router priority is 100

5. The Virtual Router Redundancy Protocol (VRRP) is a standards-based protocol

6. The router with highest priority is called Master router

7. The multicast address 224.0.0.18 is used by VRRP to send advertisements. It uses IP protocol 112.

The following are true about Virtual Router Redundancy protocol (VRRP):

1. VRRP will have one master router, and all other routers are in the backup state.

2. VRRP router priorities range from 1 to 254. By default, the priority is set to 100. 254 is the highest priority.

3. The MAC address of the virtual router is of the form 0000.5e00.01xx, where xx is the VRRP group number in the range 0 to 255 or 0 to ff hex.

4. The interval for VRRP advertisements is 1 second by default.

5. All VRRP routers are configured to preempt the current master router by default. The router priority should be highest for the preemption to occur.

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