EIGRP (Enhanced Interior Gateway Routing Protocol)
è It is a hybrid protocol, which elect the neighbor based of hope count, cost and it also considered best bandwidth.
è It have administrative distance 90(internal), external 170.
It use multicast address 188.8.131.52 for send error packet, any troubleshooting issue and full/partial update.
è It also use DUAL (Diffusing update algorithm) algorithm.
è It support both FLSM and VLSM routing.
è It Support maximum 255 hope count. ( by default 100)
è It use RTP (Reliable transport protocol) for sent update message.
è It use ASN (autonomous system No.) number for neighbor discovery, if neighbor router have different autonomous system no. than it not update in our routing table. We can assign autonomous system no. from 1 to 65535.
è EIGRP enabled command : ->
1. Router eigrp <ASN>
2. Network net-id wc-mask
è EIGRP verification command:
1. Show ip eigrp interface
List of all eigrp interface on which is eigrp is enabled ( it find based on network command).
2. Show ip protocol
List of all routing protocol which is enabled on router and list of neighbor ip address.
3. Show ip eigrp neighbor
List of all known neighbor which have same as no. . not mismatched.
4. Show ip eigrp topology
List of all successor and feasible successor path. Donn’t whole topology.
5. Show ip route
List of all ip routing table with the code of D