In the context of EIGRP, what is the multicast address used for communication among routers?

The multicast address used for communication among routers in EIGRP (Enhanced Interior Gateway Routing Protocol) is 224.0.0.10. This address is specifically designated for EIGRP multicast packets, allowing routers that are configured to use EIGRP to send and receive routing updates efficiently.

Using a multicast address facilitates the communication process, as it enables a single packet to be sent to multiple routers simultaneously, without burdening the network with broadcast traffic. In this case, 224.0.0.10 is a reserved address specifically set aside for EIGRP, ensuring that EIGRP messages reach all participating routers within the same EIGRP autonomous system.

The other addresses listed serve different purposes or refer to other protocols. For instance, 224.0.0.5 is used for OSPF (Open Shortest Path First) routers, while 224.0.0.6 is used for OSPF designated routers. This specificity in multicast addresses is integral to maintaining efficient network communication and routing protocol operations.