Part 3: EIGRPC C N A C H E A T S H E E T S

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EIGRP BASICS

EIGRP ROUTER-ID

EIGRP AUTO SUMMARIZATION

EIGRP CONFIGURATION

+ Advanced Distanced Vector Routing Protocol

+ Runs on IP protocol 88

+ Has administrative distance of 90 for internal routes and 170 for external routes

+ Uses Diffuse Update Algorithm

+ Routers form EIGRP neighbors and exchange Information

+ Cisco Proprietary, has been released to the world about a year ago.

+ Supports Unequal cost load balancing

+ Supports VLSM and Discontiguous Networks

+ EIGRP auto summarizes across major network boundaries

+ Major network boundaries are according to the generic IP address classes A, B and C

+ Auto Summarization can be turned off under EIGRP config

+ EIGRP process restarts when you turn on or turn off auto-summarization

+ It is turned on by default

+ Used to identify a router

+ By default it is the highest IP address of any physical interface that is in up/up state

+ If loopback interfaces exist, they take precedence over physical interfaces

+ Can be hardcoded using the router-ID command

+ Router-id command is preferred to loopback interfaces which is preferred to physical interfaces

+ EIGRP can be enabled in the config mode

+ The autonomous system is a representation of an independent routing domain in EIGRP + Unlike OSPF, the AS number must match for EIGRP neighbor relationship to be formed.

+ The network command uses wildcards (inverse of subnet masks)

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R1(config)#router eirgp 1R1(config-router)#router-id 1.1.1.1R1(config-if )#

R1(config)#ip route

R1(config)#router eirgp 1R1(config-router)#no auto-summary

C C N A C H E A T S H E E T S

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EIGRP METRIC

EIGRP LOAD BALANCING

EIGRP FEASIBILITY CONDITION

EIGRP LOAD BALANCING 2

+ Uses a composite metric

+ Multiple interface characteristics put together in a

formula.

o Bandwidth

o Delay

o Reliability

o Load + Use k-values to select which attributes to use in the metric

+ Only bandwidth and delay are used by default

+ K values must match throughout the Autonomous system.

+ If two EIGRP routes have the same distance, they are both selected as successor routes

+ Both routes are installed in the routing table.

+ Traffic is loadbalanced across both baths either per packet or per destination.

+ With unequal paths, by default, EIGRP chooses the best path (path with lowest composite metric)

+ This default behavior can be changed using the variance command

+ Variance allows paths with unequal costs to be installed

+ Paths must meet the feasibility condition to be installed in the routing table

+ A multiplier can be used to determine which routes are considered in unequal cost loadbalancing

+ The routes considered must have a metric less than the FD*multiplier

+ EIGRP keeps Neighbor relationships in Neighbor table

+ EIGRP keeps routes received from neighbors in Topology table

+ Each route has a reported/advertised distance distance from the neighbor to the destination

+ Best route is called successor route

+ The feasible distance is the distance of the best path (distance to best neighbor + its reported distance)

+ A neighbor can be a feasible successor if its reported distance is less than the feasible distance

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R1(config)#router eigrp 1R1(config-router)#variance 2R1(config-router)#