EIGRP Router ID:





It Can be any IP address except for 0.0.0.0 and 255.255.255.255.T he router ID will be the highest IP address of any loop- back interfaces. If there no loopback interfaces are configured, the router ID will be the highest IP address of the active local interface.











Router ID Configuration:





Router(config)#router eigrp 200

Router(config-router)#eigrp router-id 192.168.10.100





Remove Router ID:

Router(config-router)#no eigrp router-id 192.168.10.100





Configures the EIGRP hello time and Hold Time:





EIGRP advertises its complete information is when it discovers a new neighbor and forms an adjacency (neighbor ship) with it by the exchange of Hello packets. EIGRP participants routers must also continue sending and receiving Hellos from their neighbors.





Router(config)#interface serial 0/0/1

Router(config-if)#ip hello-interval eigrp 200 10

Router(config-if)#ip hold-time eigrp 200 30





IPv6:





Router(config-if)#ipv6 hello-interval eigrp 200 10

Router(config-if)#ipv6 hold-time eigrp 200 40









EIGRP Auto-Summarization:





EIGRP by default auto-summarize classful boundaries ,But no worries there are ways to make this work; it just doesn’t work by default. I will show you how to fix this by using no auto-summary command when we configure EIGRP.





Router(config-router)#auto-summary

Router(config-router)#no auto-summary





EIGRP Manual-Summarization:





Router(config)#interface fastethernet 0/0

Router(config-if)#ip summary-address eigrp 200 10.10.0.0 255.255.0.0 75





Equal-Cost Load Balancing:





EIGRP will do load-balance across both links automatically when they are of equal cost, but EIGRP can load balance across unequal cost links as well if we use the variance command. By default the variance metric is set to 1 ,That only equal cost links will load balance.





Router(config)#router eigrp 110

Router(config-router)#network 192.168.100.0

Router(config-router)#maximum-paths 5

Router(config)#ipv6 router eigrp 110

Router(config-rtr)#maximum-paths 5





Unequal-Cost Load Balancing:





Router(config)#router eigrp 110

Router(config-router)#network 192.168.100.0

Router(config-router)#variance n

Router(config)#ipv6 router eigrp 110

Router(config-rtr)#variance n





Bandwidth Use:





Router(config)#interface serial 0/0/0

Router(config-if)#bandwidth 256

Router(config-if)#ip bandwidth-percent eigrp 50 100

Router(config-if)#ipv6 bandwidth-percent eigrp

100 75





Verifying EIGRP:







