What multicast IPv4 address does GLBP use?

GLBP, or Gateway Load Balancing Protocol, uses the multicast IPv4 address 224.0.0.102. This specific address is designated for the purposes of GLBP, allowing routers participating in the GLBP group to communicate with one another efficiently. Each router that is a member of the GLBP group listens for packets sent to this multicast address, enabling them to participate in the load balancing and redundancy provided by the protocol.

The choice of a multicast address in this range is crucial, as it ensures that the GLBP traffic is delivered only to the routers that are configured to respond to GLBP, minimizing unnecessary traffic on other devices and networks. This targeted approach helps maintain efficient operation and responsiveness within the group. The other addresses listed do not align with GLBP’s operational standards or purposes, which is why they are not the correct choice.