Tuesday, July 2, 2019

EIGRP - What If a Route Announcement Is Missed?

I’ve been studying OSPF and EIGRP in prep for ICND2 and find something lacking about EIGRP: routes are never re-flooded, only changes or updates. A transport protocol like TCP could enforce message receipt, but EIGRP doesn’t use a transport protocol. So what if there is some type of loss when a route announcement is sent to the neighbor, preventing the neighbor from ever learning a route?

OSPF seems to handle this by re-flooding all LSAs every 30 minutes. BGP uses TCP (I get that it’s in a other class of routing protocols though). Split horizon prevents the original router from ever seeing its own connected routes have been learned by the neighbor too. So how would EIGRP handle packet loss and ensure routes are successfully learned by neighbors?



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