EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP is a Cisco- proprietary Hybrid routing protocol, incorporating features of both Distance- Vector and. complete description of the EIGRP commands listed in this chapter, refer to the For protocol-independent features that work with EIGRP, see the chapter. Aug 10, This paper is an introduction to the Interior Gateway Routing Protocol (IGRP) suite of routing protocols designed and developed by Cisco.

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By default, Enhanced Interior Gateway Routing Protocol (EIGRP) chooses a route based on minimum path bandwidth and accumulative delay, however in the. EIGRP is a Cisco-proprietary routing protocol that is based on IGRP. classful routing protocol, EIGRP boasts faster convergence times, improved scalability. Mar 26, Understanding basics of EIGRP routing protocol is very important before configuring the protocol in production environment. EIGRP is an ad.

We want routing protocols to be nice and quiet and only base their routing decisions on static values like bandwidth and delay. For the purposes of comparing routes, these are combined together in a weighted formula to produce a single overall metric: where the various constants K1 to K5 can be set by the user to produce varying behaviours. An important and unintuitive fact is that if K5 is set to zero, then term is not used i. Delay: sums of delays in the path multiplied by in tens of microseconds.

Update: Updates are used to send route information to the neighbour routers. When a new neighbour is discovered, update packets are sent so the neighbour router can build up its topology table. In this case, update packets are unicast.

In other cases, such as a link cost change, updates are multicast. An acknowledgement is sent for the update packet.

Query: Used for requesting specific route information.

Queries are always multicast unless they are sent in response to a received query. Queries are sent when destinations go into Active state. An acknowledgement is sent for the query packet. Reply: Reply packets respond to a query to indicate to the originator router that it does not need to go into Active state because it has feasible successors for the destination network.

Replies are unicast to the originator of the query. Replies are sent when destinations go into Active state. An acknowledgement is sent for the reply packet. Acknowledgment is always sent using a unicast address and contains a non-zero acknowledgment number. An acknowledgement is not sent for the Hello and Acknowledgement packet.

A successor route is used by EIGRP to forward traffic to a destination and is stored in the routing table.

It is backed up by a feasible successor route that is stored in the topology table—if one is available. Feasible successor — A feasible successor is a path whose reported distance is less than the feasible distance, and it is considered a backup route. EIGRP is going to keep up to six feasible successors in the topology table.

Only the one with the best metric the successor is copied and placed in the routing table. Feasible distance — This is the best metric along all paths to a remote network. Active Route — It means that the router is actively trying to find out a route for the destination, if the successor fails.

Unlike most distance vector routing protocols, EIGRP does not transmit all the data in the router's routing table when a change is made, but will only transmit the changes that have been made since the routing table was last updated.

EIGRP Protocol in (ROMAN URDU)

EIGRP does not send its routing table periodically, but will only send routing table data when an actual change has occurred. This behavior is more inline with link-state routing protocols , thus EIGRP is mostly considered a hybrid protocol.

They form a relationship, known as an adjacency. The entire routing table is exchanged between both routers at this time. After the exchange has completed, only differential changes are sent. EIGRP is often considered a hybrid protocol because it is also sends link state updates when link states change. Routes are not summarized at the classful network boundary unless auto summary is enabled.

Support for load balancing on parallel links between sites. The ability to use different authentication passwords at different times.

Understanding Basics of EIGRP Routing Protocol

MD5 and SHA-2 authentication between two routers. Sends topology changes, rather than sending the entire routing table when a route is changed. Periodically checks if a route is available, and propagates routing changes to neighboring routers if any changes have occurred.

Backwards compatibility with the IGRP routing protocols.

The 0. The no auto-summary command prevents automatic route summarization on classful boundaries, which would otherwise result in routing loops in discontiguous networks. Router configure terminal Router config router eigrp 1 Router config-router network EIGRP composite and vector metrics[ edit ] EIGRP associates six different vector metrics with each route and considers only four of the vector metrics in computing the Composite metric: Router1 show ip eigrp topology EIGRP maintains a hop count for every route, however, the hop count is not used in metric calculation.

It is only verified against a predefined maximum on an EIGRP router by default it is set to and can be changed to any value between 1 and Routes having a hop count higher than the maximum will be advertised as unreachable by an EIGRP router.Download pdf. When a new neighbour is discovered, update packets are sent so the neighbour router can build up its topology table.

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Be prepared for it. An acknowledgement is sent for the reply packet.

We want routing protocols to be nice and quiet and only base their routing decisions on static values like bandwidth and delay. The old path that is no longer available is removed from the routing table. RIP allowed 15 hops counts. Router show ip eigrp neighbors To view information about the EIGRP routing protocol operations, execute the following command.

If it does not, it has to start a route computation and enter the active state.

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