05-15-2018 10:14 AM - edited 03-08-2019 03:01 PM
So I have a situation where I have a layer 3 switch (R3-1) that is 2 hops away from the subnet on R1 (another layer 3 switch). It has formed an eigrp neighbor with the two layer 3 switches (R2-1 and R2-2) that are one hop away from R1 however it is not getting the route to R1 but instead it is getting a route that goes through R4 which is connected to R3-2 (which then connects back to R2-1 and R2-2).
All ports are gigabit Ethernet ports (so they have the same cost) and every layer 3 device has router eigrp 100.
I've attached a network diagram with direction the route is passed and what the composite metric of the route is (from show ip eigrp topology 10.1.1.16/28 on each device).
How do I get R3-1 to be the proper 2 Hops from R1?
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05-15-2018 12:49 PM
So going through the show ip topology I found that only the subnets on R1 were misrouted. R3-1 has the appropriate number of hops to subnets on other switches that were similarly connected as R1.
When I looked I found that the Router ID was the same on R1 as it was on R3-1. I fixed the Router ID to be different and it resolved the issue.
05-15-2018 10:41 AM
Hello,
post the output of 'show ip eigrp topology' from Router R3-1.
Is this a live network or a simulation ?
05-15-2018 11:27 AM
So this is a live network, which makes me leery of posting the complete "show ip eigrp topology". Is there something in particular you are looking for?
05-15-2018 11:35 AM
Hello,
the thing is, even with advanced traffic engineering it is pretty hard to get a route over 4 hops preferred to a route over 2 hops.
Check the configs of the routers and if things like the delay on the interfaces have been altered...
05-15-2018 12:49 PM
So going through the show ip topology I found that only the subnets on R1 were misrouted. R3-1 has the appropriate number of hops to subnets on other switches that were similarly connected as R1.
When I looked I found that the Router ID was the same on R1 as it was on R3-1. I fixed the Router ID to be different and it resolved the issue.
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