Characteristic of EIGRP
-EIGRP is Enhanced Interior Gateway Routing Protocol.
-EIGRP known as hybrid protocol because it has characteristic of both distance vector routing protocol and link state routing protocol.
-EIGRP is based on Bellman-Ford algorithm.
-Administrative distance of EIGRP is 90 for internal route and 170 for external route and 5 for the summary route.
-Metric of EIGRP is composite based upon following components
Bandwidth
Delay
Load
Reliability
Maximum transmission unit (MTU)
-By default EIGRP consider bandwidth and delay as its metric.
-Auto summarization is by default enable in EIGRP and it can be turn off via no auto-summary command under EIGRP process.
-EIGRP support VLSM, multicasting and CIDR.
-Multicast address of EIGRP is 224.0.0.10.
-EIGRP only works on Cisco router and switches.
-EIGRP routers also creates three table like OSPF-
Neighbor table
Topology table
Routing table
-EIGRP router send hello message in every 5 seconds on point to point and Broadcast Multiple Access (BMA) type network and in every 60 seconds on Non Broadcast Multiple Access (NBMA) type network.
-Hold-down timer in EIGRP is 15 second and 180 seconds on point to point and NBMA network type respectively.
-For neighborship following component must be match in EIGRP-
ASN (Autonomous system number)
Metric weights
Hello must be received
-EIGRP router sends entire copy of its routing table to the directly connected neighbors at the time of neighbor adjacency. If any change in the EIGRP topology then only partial update will send to the intended router only.
-EIGRP is the only protocol in the world that have back up path to reach at destination if multiple path exists.
-EIGRP uses DUAL to calculate primary and back up path.
-DUAL has following components-
Successor
Feasible successor
Reported distance
Feasible distance
-EIGRP uses RTP instead of TCP for the acknowledgment of EIGRP packets.
-EIGRP support discontiguous network.
-EIGRP support autonomous system number.
-Value of ASN lies between 1-65535.
-Router belong to same ASN can communicate with the help EIGRP.
-Router belong to different ASN require redistribution between different ASN.
-AS (autonomous system is a collection or group of the router and switches under the same technical administration that have same routing policies.
-EIGRP is a classless routing protocol.
-EIGRP by default load balance on 4 equal paths, maximum can be 16.
-EIGRP can also load balance on unequal path with the help of variance factor.
-Variance factor is a multiplier and by default its value is 1.
-Range of variance factor lies between 1-128.
-EIGRP support MD 5 authentication.
-Manual summarization is possible at any router in EIGRP.
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