07-08-2020 01:11 PM
A L3 switch is connected to two routers via 172.16.90.2 on R2 and 172.16.90.3 on R1. I'm seeing 100.127.1.0 via both .2 and .3. But for 100.126.1.0 network, I'm seeing the route only via 172.16.90.3 on eigrp as shown below. What would be the reason for this ? can somebody please guide me
Switch#sh ip route eigrp
D EX 100.100.0.0/16 [170/26112] via 172.16.90.3, 00:00:41, Vlan1
[170/26112] via 172.16.90.2, 00:00:41, Vlan1
D EX 100.125.0.0/16 [170/25600512] via 172.16.90.3, 00:00:50, Vlan1
[170/25600512] via 172.16.90.2, 00:00:50, Vlan1
D EX 100.127.1.0/30 [170/25600512] via 172.16.90.3, 00:00:50, Vlan1
[170/25600512] via 172.16.90.2, 00:00:50, Vlan1
D EX 100.126.1.0/30 [170/25600512] via 172.16.90.3, 00:01:27, Vlan1
D EX 100.64.4.0/24 [170/25600512] via 172.16.90.3, 00:00:50, Vlan1
[170/25600512] via 172.16.90.2, 00:00:50, Vlan1
Switch#sh ip eigrp top
P 100.100.0.0/16, 2 successors, FD is 26112
via 172.16.90.2 (26112/25856), Vlan1
via 172.16.90.3 (26112/25856), Vlan1
P 100.125.0.0/16, 2 successors, FD is 25600512, tag is 65000
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1
P 100.127.1.0/30, 2 successors, FD is 25600512, tag is 65000
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1
P 100.126.1.0/30, 1 successors, FD is 25600512, tag is 65000
via 172.16.90.3 (25600512/25600256), Vlan1
P 100.64.2.0/29, 2 successors, FD is 25600512, tag is 65000
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1
07-08-2020 01:54 PM
Hello,
Can you provide both show ip route eigrp and show ip eigrp top for both routers for 100.127.1.0 and 100.126.1.0?
07-09-2020 01:55 PM
07-09-2020 06:03 PM - edited 07-09-2020 06:03 PM
Hello,
You can see in Router1 you have both 100.127.1.0 and 100.126.1.0. However, in Router2 you only have 100.127.1.0. This is why the upstream switch is only getting 100.126.1.0 once because Router2 doesn't have the route to advertise to the switch.
If you are redistributing from BGP, do you see the route in your BGP table? show ip bgp 100.126.1.0/30
If you do, what does your EIGRP config look like? Are you blocking any routes from being redistributed?
If you don't, you will need to look into why BGP is not getting the route.
Hope that helps!
07-08-2020 02:37 PM
perhaps it is more BGP fault than EIGRP. any recent changes in BGP tables?
are there 2x 100.126.1.0 networks if you do show ip eigrp topology all-routes ? all-routes keyword shows all routes not only successors and feasible successors; maybe
Regards, ML
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07-09-2020 02:04 PM
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