300-320 · Question #51
Which multicast address must be available for FHRP advertisements in a multivendor environment?
The correct answer is B. 224.0.0.18. In a multivendor environment, VRRP (Virtual Router Redundancy Protocol) is the IETF open standard FHRP (RFC 5798) and uses multicast address 224.0.0.18. HSRP is Cisco-proprietary and uses 224.0.0.2 (HSRPv1) or 224.0.0.102 (HSRPv2/GLBPv1). GLBP is also Cisco-proprietary. Because…
Question
Which multicast address must be available for FHRP advertisements in a multivendor environment?
Options
- A224.0.0.9
- B224.0.0.18
- C224.0.0.102
- D224.0.0.2
How the community answered
(19 responses)- B95% (18)
- D5% (1)
Explanation
In a multivendor environment, VRRP (Virtual Router Redundancy Protocol) is the IETF open standard FHRP (RFC 5798) and uses multicast address 224.0.0.18. HSRP is Cisco-proprietary and uses 224.0.0.2 (HSRPv1) or 224.0.0.102 (HSRPv2/GLBPv1). GLBP is also Cisco-proprietary. Because VRRP is vendor-neutral and interoperable across different hardware vendors, 224.0.0.18 is the address that must be available for FHRP advertisements in a multivendor deployment. The other addresses are tied to Cisco-proprietary protocols.
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