Not seeing the directly connected interface being redistributed to EIGRP from BGP

[Vinayaka]

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

[brselzer]

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? 

[Vinayaka]

Please find the sh ip route eigrp and sh ip eigrp top for both the routers below

Router For 100.127.1.0

Router1#sh ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 172.16.90.1 to network 0.0.0.0
D*EX 0.0.0.0/0 [170/28416] via 172.16.90.1, 00:33:09, GigabitEthernet0/2

Router1#sh ip eigrp top
EIGRP-IPv4 Topology Table for AS(99)/ID(172.16.90.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status

P 100.127.1.0/30, 1 successors, FD is 25600256
via Redistributed (25600256/0)
P 100.126.1.0/30, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.65.0.0/30, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.125.0.0/16, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.100.0.0/16, 1 successors, FD is 25856
via Rstatic (25856/0)
P 100.64.2.0/29, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 0.0.0.0/0, 1 successors, FD is 28416
via 172.16.90.1 (28416/28160), GigabitEthernet0/2


Router For 100.126.1.0

Router2#sh ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is 172.16.90.1 to network 0.0.0.0
D*EX 0.0.0.0/0 [170/28416] via 172.16.90.1, 00:05:06, GigabitEthernet0/2

Router2#sh ip eigrp top
EIGRP-IPv4 Topology Table for AS(99)/ID(172.16.90.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 100.127.1.0/30, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.65.0.0/30, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.125.0.0/16, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 100.100.0.0/16, 1 successors, FD is 25856
via Rstatic (25856/0)
P 100.64.2.0/29, 1 successors, FD is 25600256, tag is 65000
via Redistributed (25600256/0)
P 0.0.0.0/0, 1 successors, FD is 28416
via 172.16.90.1 (28416/28160), GigabitEthernet0/2

[brselzer]

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!

[Martin L]

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
**Please Rate All Helpful Responses **

[Vinayaka]

There were no recent changes on the BGP tables. There is Only 1x 100.126.1.0 Network. I couldn't do #sh ip eigrp top all-routes, but I could do #sh ip eigrp top all-links and below is the result

Switch#sh ip eigrp topology all-links
EIGRP-IPv4 Topology Table for AS(99)/ID(172.16.90.4)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 100.127.1.0/30, 2 successors, FD is 25600512, tag is 65000, serno 9335104
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, serno 9335134
via 172.16.90.3 (25600512/25600256), Vlan1
P 100.65.0.0/30, 2 successors, FD is 25600512, tag is 65000, serno 9335097
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1
P 100.125.0.0/16, 2 successors, FD is 25600512, tag is 65000, serno 9335103
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1
P 0.0.0.0/0, 1 successors, FD is 28416, serno 40456
via 172.16.90.1 (28416/28160), Vlan1
P 100.100.0.0/16, 2 successors, FD is 26112, serno 9288967
via 172.16.90.2 (26112/25856), Vlan1
via 172.16.90.3 (26112/25856), Vlan1
P 100.64.2.0/29, 2 successors, FD is 25600512, tag is 65000, serno 9335094
via 172.16.90.2 (25600512/25600256), Vlan1
via 172.16.90.3 (25600512/25600256), Vlan1

Thank you,
Vinayaka