Igrp And Eigrp And Router-id Option

zillah

For OSPF and BGP we configure "router-id". One of use this command for OSPF is selecting DR and BDR.

Why do we need to configure this for EIGRP or IGRP ?

darkuser

mostly for stability and so you always know the source of routing updates.
you can create a loopback and set the router-id to be the loopback.
this frees it from being tied to the performance of a physical interface.

then if you have instability in an interface you won't have routing problems.

this also applies for other routing protcols.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/1rfeigrp.htm#wp1031884