Enhanced Interior Gateway Routing Protocol - Other Details

Other Details

EIGRP supports Classless Inter-Domain Routing (CIDR), allowing the use of variable-length subnet masks—one of the protocol's improvements over its predecessor.

EIGRP is not usable in applications where routers need to know the exact network topology (for example, traffic engineering in MPLS).

EIGRP can run separate routing processes for Internet Protocol (IP), IPv6, IPX and AppleTalk through the use of protocol-dependent modules (PDMs). However, this does not facilitate translation between protocols.

Example of setting up EIGRP on a Cisco IOS router for a private network. The 0.0.15.255 wildcard in this example indicates a subnetwork with a maximum of 4094 hosts—it is the bitwise complement of the subnet mask 255.255.240.0. The no auto-summary command prevents automatic route summarization on classful boundaries, which would otherwise result in routing loops in discontiguous networks.

Router> enable Router# config terminal Router(config)# router eigrp 1 Router(config-router)# network 10.201.96.0 ? A.B.C.D EIGRP wild card bits Router(config-router)# network 10.201.96.0 0.0.15.255 Router(config-router)# no auto-summary Router(config-router)# end

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