Cisco EIGRP

EIGRP är ett distance vector routing protokoll med en del karaktär av link state protocol. Det är protokoll utvecklat av Cisco, det har varit properitärt men är sedan 2013 släppt, dock bara som Informational RFC. EIGRP använder ett eget IP-protokoll (88) på lager 4, Reliable Transport Protocol. Det används båda för unicast och multicast. För topologiuträkningar används DUAL.

Databaser

• Neighbor table
• Topology table
• Routing (Forwarding) table

Adjacency

• Hello packet - Multicast 224.0.0.10, every 5 seconds.
• AS nummer måste vara samma på alla routrar.
• K values need to match in EIGRP AS domain in order for neighbours to form

Metric

• k1 = bandwidth
• k2 = load
• k3 = delay
• k4 = reliability
• k5 = MTU

Simplified default metric = bandwidth + delay

Konfiguration

router eigrp [ASN]

Manually set ID

eigrp router-id [ip-address]

Add networks to advertise

network [ip-address] [wildcard-mask]

Disable automatic route summarization (Default sedan IOS 15)

no auto-summary

Designate passive interfaces

passive-interface [interface]

Statically identify neighoring routers

neighbor [ip-address] [interface]

MD5 authentication

interface [interface]
ip authentication mode eigrp md5
ip authentication key-chain eigrp [ASN] [name-of-chain]

Summering

ip eigrp summary-address 192.168.0.0 255.255.0.0

4 paths default, 16 maximum

maximum-paths 12

Receive updates only

eigrp stub receive-only

Redistribution

Default seed metric: infinity

Static

redistribute static

RIP

redistribute rip metric 1500 100 255 1 1500

OSPF

redistribute ospf 1

Show

show ip eigrp neighbors 
show ip eigrp topology
show ip eigrp interfaces detail
show ip eigrp traffic
show ip protocols