04-20-2016 07:40 AM - edited 03-05-2019 03:51 AM
Hi ,
Iam facing issue with EIGRP not load balancing . Just to give you all a quick background
. The branch had two ASR routers. One of the ASR router( router 1) is connected to a Hub router ( let me call it Hub 1) and another ASR router(router 2) was connected to hub 2 Router
Recently we replaced Hub 2 router as well as branch router 2 with 4500x switch at both the end.
After we made this changes we see the EIGRP is not getting load balanced. We checked from the Distribution L3 switch by running sh ip route 0.0.0.0 we see the route is learned only via the Router1/hub1 segment and it is not learning through the second leg( Router2/hub2) after we replaced the routers with 4500x.
Kindly note the
I want to know why there is a why there is a different behavior using ‘ip summary-address’ command between ASR1004 and 4500x boxes.
secondly is the EIGRP not load balancing because one leg has ASR routers with IPsec tunnel in which EIGRP is riding over it and another leg has 4500x .
You expert suggestion is appreciated.
04-20-2016 07:49 AM
We do not know enough of the detail to be able to say exactly what it is, but clearly when your environment was two ASR routers then the EIGRP metrics advertised were exactly the same and EIGRP load balanced. And clearly when you changed from an ASR to 4500 something changed and the EIGRP metrics advertised are not the same. Perhaps it is the difference of not having the IPsec, or perhaps it is that the switch interfaces have a different bandwidth than the ASR did.
HTH
Rick
04-21-2016 04:34 AM
Hi Rick,
Thanks for the reply and which helped me to look in the right direction. Infact I checked further and found there is a difference in bandwidth b/w both the legs of the link. The 4500x has different bandwidth than that of ASR routers which is causing all the traffic flow only through the ASR routers.
when I did sh ip route 0.0.0.0 0.0.0.0 from 4500x box itself , instead of learning the routes through directly connected WAN link , it is learning through LAN segment.
Does on Leg having IPsec and another not having IPsec makes any difference.
Thanks again for helping me to go in right direction.
04-21-2016 05:41 AM
I am glad that my suggestion pointed you in the right direction. Having IPsec or not having IPsec would not make a difference if EIGRP is running on the physical interface but could make a difference if EIGRP is running through the IPsec.
HTH
Rick
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