EIGRP Entries Missing in Routing Table

[AkbarAliSheikh]

Hi All,

I have got two L3 switches, Cat3550 and Cat3560X. Cat3550 is present at head office and Cat3560X at the branch office. Both connected by 10MB LES link and have VLAN74.

Configs of Head Office switch is as below:

HeadOffice1#sh run int fa0/20 (Connecting Interface)

interface FastEthernet0/20

switchport access vlan 74

switchport mode access

no ip address

no logging event link-status

speed 10

end

HeadOffice1#sh ip route 192.168.74.2 (Route to Branch Office)

Routing entry for 192.168.74.0/24

  Known via "connected", distance 0, metric 0 (connected, via interface)

  Redistributing via eigrp 200

  Routing Descriptor Blocks:

  * directly connected, via Vlan74

      Route metric is 0, traffic share count is 1

Configs of Branch Office switch is as below:

BranchOffice#sh run int gi0/1 (Connecting Interface)

interface GigabitEthernet0/1

switchport access vlan 74

switchport mode access

speed auto

end

BranchOffice#sh ip route 192.168.74.1 (Route to Head Office)

Routing entry for 192.168.74.0/24

  Known via "connected", distance 0, metric 0 (connected, via interface)

  Redistributing via eigrp 200

  Routing Descriptor Blocks:

  * directly connected, via Vlan74

      Route metric is 0, traffic share count is 1

When I do 'sh ip route eigrp 200' on the branch office switch i dont see any entries for EIGRP in the routing table. There is also a default route set on this switch 'ip route 0.0.0.0 0.0.0.0 192.168.74.1' to forward all traffic to the HeadOffice switch.

BranchOffice#sh ip route

Codes: 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

Gateway of last resort is 192.168.74.1 to network 0.0.0.0

C    192.168.74.0/24 is directly connected, Vlan74

S*   0.0.0.0/0 [1/0] via 192.168.74.1

HeadOffice has links to other branch offices which are all part of EIGRP 200. Other sites' switches can see entries for other subnets but just not this site.

Can you advise if there is something which is have missed in the config?

Thank you in advance

[Giuseppe Larosa]

Hello Akbar,

on HQ C3550 switch you should see the configuration of SVI interface Vlan74.

There is a chance that the command

ip summary-address eigrp 200 0.0.0.0 0.0.0.0

have been used on HQ side to send out only an EIGRP default route to branch office

The EIGRP default route is overriden by the static route on the branch office C3560 for the lower admin distance so no EIGRP route is installed on the branch office device even if  EIGRP is fine,.

You can check the state of the EIGRP neighborship

with

show ip eigrp neighbors

check if  there is an EIGRP neighbor for Vlan 74 on the branch office switch

You can use

show ip eigrp topology

to see the contents of the EIGRP topology table on the branch office switch

Hope to help

Giuseppe

[AkbarAliSheikh]

Hi Giuseppe,

I have checked the HQ switch which had 'passive-interface Vlan74' configured for EIGRP 200. Once i have removed this I can see the EIGRP entries in the routing table. All working now.

Thank you for your advise and much appreciated.