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CCNA Routing and Switching Portable Command Guide: Enhanced Interior Gateway Routing Protocol (EIGRP)

Sample Chapter is provided courtesy of Cisco Press.
Date: Jun 24, 2013.

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Chapter Information

Configuring Enhanced Interior Gateway Routing Protocol (EIGRP) / EIGRP Auto-Summarization
EIGRP Manual Summarization / Passive EIGRP Interfaces / Equal-Cost Load Balancing: Maximum Paths / Unequal-Cost Load Balancing: Variance
Bandwidth Use / Authentication
Verifying EIGRP / Troubleshooting EIGRP
Configuration Example: EIGRP

Chapter Description

The excerpt from The CCNA Routing and Switching Portable Command Guide summarizes all CCNA certification-level Cisco IOS® Software commands, keywords, command arguments, and associated prompts for topics related to the Enhanced Interior Gateway Routing Protocol (EIGRP).

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EIGRP Manual Summarization

`Router(config)#interface fastethernet 0/0`	Enters interface configuration mode.
`Router(config-if)#ip summary-address eigrp 100 10.10.0.0 255.255.0.0 75`	Enables manual summarization for EIGRP autonomous system 100 on this specific interface for the given address and mask. An administrative distance of 75 is assigned to this summary route.
	NOTE The administrative-distance argument is optional in this command. Without it, an administrative distance of 5 is automatically applied to the summary route.

CAUTION

EIGRP automatically summarizes networks at the classful boundary. A poorly designed network with discontiguous subnets could have problems with connectivity if the summarization feature is left on. For instance, you could have two routers advertise the same network—172.16.0.0/16—when in fact they wanted to advertise two different networks—172.16.10.0/24 and 172.16.20.0/24.

Recommended practice is that you turn off automatic summarization if necessary, use the ip summary-address command, and summarize manually what you need to.

Passive EIGRP Interfaces

`Router(config)#router eigrp 110`	Starts the EIGRP routing process.
`Router(config-router)#network 10.0.0.0`	Specifies a network to advertise in the EIGRP routing process.
`Router(config-router)#passive-interface fastethernet 0/0`	Prevents the sending of hello packets out the Fast Ethernet 0/0 interface. No neighbor adjacency will be formed.
`Router(config-router) #passive-interface default`	Prevents the sending of hello packets out all interfaces.
`Router(config)#no passive- interface serial 0/0/1`	Enables hello packets to be sent out interface Serial 0/0/1, thereby allowing neighbor adjacencies to form

Equal-Cost Load Balancing: Maximum Paths

`Router(config)#router eigrp 100`	Creates routing process 100
`Router(config-router)#network 10.0.0.0`	Specifies which network to advertise in EIGRP
`Router(config-router)#maximum-paths 6`	Set the maximum number of parallel routes that EIGRP will support to 6

Unequal-Cost Load Balancing: Variance

`Router(config)#router eigrp 100`	Creates routing process 100
`Router(config-router)#network 10.0.0.0`	Specifies which network to advertise in EIGRP
`Router(config-router)#variance n`	Instructs the router to include routes with a metric less than or equal to n times the minimum metric route for that destination, where n is the number specified by the variance command

3. Bandwidth Use / Authentication | Next Section Previous Section

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