Oct 21

Briefly Explained The EIGRP


EIGRP could be a Cisco proprietary routing protocol loosely supported their original IGRP (Interior Routing Protocol). EIGRP is a sophisticated distance-vector routing protocol, it will solely use it in AN all-Cisco network, however EIGRP over makes up for this deficiency by being straightforward to assemble, fast, and reliable.

EIGRP is predicated on a distance vector rule that determines the simplest path to a destination. however, EIGRP uses an additional complicated metric than RIP’s straightforward hop count. The EIGRP metric is predicated on the minimum information measure and internet delay on every doable path, which implies that EIGRP will accommodate larger networks than RIP.

Cisco enclosed such a lot of helpful options like automatic two-way distribution that build the migration from IGRP to EIGRP comparatively easy.

EIGRP operates terribly with efficiency over giant networks. It achieves this potency partly by causing non-periodic updates. this suggests that, unlike RIP, EIGRP solely distributes info concerning routes that have modified, and only if there’s an amendment to report. the remainder of the time, routers solely exchange little “Hello” packets to verify that routing peer’s area unit still out there. So, in a very comparatively stable network, EIGRP uses little information measure. this can be particularly helpful in WAN configurations.

Every router in AN EIGRP network includes a topology table, that could be a central feature of the twin rule. anytime a router receives a brand-new piece of routing info from one among its neighbours, it updates the topology table. This helps to allow it a reliable and up-to-date image of all the connections within the network that area unit presently in use. each destination subnet best-known to EIGRP seems within the topology table.

EIGRP includes several of the options like democratic Inter-Domain Routing (CIDR) and Variable Length Subnet Masks (VLSM) that area unit required in larger networks.

Features of EIGRP

EIGRP is a sophisticated distance vector or hybrid routing protocol that has the subsequent features:

speedy convergence: EIGRP uses the distributive Update rule (DUAL) to realize speedy convergence. A router that uses EIGRP stores all out their backup routes for destinations so it will quickly adapt to alternate routes. If no applicable route or backup route exists within the native routing table, EIGRP queries its neighbours to find AN alternate route.

Reduced information measure usage: EIGRP doesn’t build periodic updates. Instead, it sends partial

updates once the trail or the metric changes for that route. once path info changes, DUAL sends AN update concerning solely that link instead of concerning the whole table.

Democratic routing: as a result of EIGRP could be a democratic routing protocol, it advertises a routing

mask for every destination network. The routing mask feature allows EIGRP to support discontinuous subnetworks and variable-length subnet masks (VLSM).

Multiple network layer support: EIGRP supports AppleTalk, scientific discipline version four (IPv4), IP version

6 (IPv6), and Novell Internetwork Packet Exchange (IPX), that use protocol-dependent modules (PDM). PDMs area unit to blame for protocol needs that area unit specific to the network layer.

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