IP-EIGRP(Default-IPRouting-Table:10): Neighbor xxx.xxx.xxx.xxx not on common subnet

Unanswered Question
Oct 27th, 2011

Ok, I have an odd EIGRP issue that has started since I swapped out a 2811 router for a new 2911. Ever since we made the swap I have the following appearing in the log on the 3560 switch connected to the new router. The router and the switch are the only two devices that are running EIGRP. The router does run BGP as well so that it can connect to my ISP. 99.9% of the config from the old router was basically pasted into the new router.

Oct 24 05:38:22 CST: IP-EIGRP(Default-IP-Routing-Table:10): Neighbor 192.168.37.1 not on common subnet for Vlan9

Oct 24 05:41:12 CST: IP-EIGRP(Default-IP-Routing-Table:10): Neighbor 192.168.39.1 not on common subnet for Vlan7

Oct 24 05:41:53 CST: IP-EIGRP(Default-IP-Routing-Table:10): Neighbor 192.168.39.1 not on common subnet for Vlan7

Oct 24 06:18:41 CST: IP-EIGRP(Default-IP-Routing-Table:10): Neighbor 192.168.39.1 not on common subnet for Vlan7

could understand this if I had multiple routers connected to the switch and everything not being in the same network but I have a point-to-point between the single router and the single switch. The point-to-point is not in the same networks at the network these VLANs are in. This location is also running 12 other VLANs but these are the only two that are in the complaints list. I have this same senario running at other locations and everything seems to be fine. I figure I have looked at this so long and so many times I am missing something simple.

Point-to-point connection ...

     switch side ...

          interface GigabitEthernet0/1

          description Link to 2911

          no switchport

          ip address 192.168.38.34 255.255.255.252

          speed 1000

          duplex full

     router side ...

          interface GigabitEthernet0/0

          description LAN

           ip address 192.168.38.33 255.255.255.252

           ip flow ingress

           ip flow egress

           duplex auto

           speed 1000

EIGRP configuration

     switch side ...

          router eigrp 10

          redistribute connected

          redistribute static

          network 192.168.32.0

          network 192.168.33.0

          network 192.168.34.0

          network 192.168.35.0

          network 192.168.36.0

          network 192.168.37.0

          network 192.168.38.0

          network 192.168.39.0

          network 192.168.92.0

          network 192.168.93.0

          no auto-summary

    

     router side...

          router eigrp 10

          default-metric 10000 100 255 1 1500

          network 192.168.32.0

          network 192.168.33.0

          network 192.168.34.0

          network 192.168.35.0

          network 192.168.36.0

          network 192.168.37.0

          network 192.168.38.0

          network 192.168.39.0

          network 192.168.92.0

          network 192.168.93.0

          !

          router bgp 65004

          bgp log-neighbor-changes

          redistribute connected metric 100

          redistribute eigrp 10

          neighbor 10.1.4.26 remote-as 13979

          neighbor 10.1.4.26 soft-reconfiguration inbound

          neighbor 10.1.4.26 distribute-list 10 in

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Average Rating: 0 (0 ratings)
svaibhava Thu, 10/27/2011 - 09:03

Hi bberry

c2911 is the one facing the ISP and connecting the c3560 and the users behind it to the external world. Is that correct ?

From my understanding based on the above description the network setup seems to be as below

                                                                      ISP

                                                                        !

                                                                    eBGP

                                                                        !

                                                                     c2911

                                                                         !

                                                                      Gi0/0

                                                                          !

                                                                     EIGRP over  192.168.38.32/30

                                                                         !

                                                                     Gi0/1

                                                                          !

                                                                       c3560

                                                                      !    !   !

                                                                   Vlan9   Vlan7

                                                                            !   !

                                                                        LAN_Users

When c2911 is the intermediate L3 hop to reach the WAN and acts as WAN _GWRTR and c3560 is the LAN_GW Hop then why we have the LAN VLANs announced in the EIGRP config of c2911..I believe c2911 has no VLANs 

.Its not needed there and might be causing the issue.Thats my thought as this moment of time.

Can you share the vlan intefcace config of c3560 for Vlan 9 and Vlan 7. 

Hope this provides some insight into the current issue and help dig further into this.

Regards

Varma

Actions

Login or Register to take actions

This Discussion

Posted October 27, 2011 at 7:50 AM
Stats:
Replies:1 Avg. Rating:
Views:1181 Votes:0
Shares:0

Related Content

Discussions Leaderboard

Rank Username Points
1 15,007
2 8,155
3 7,745
4 7,083
5 6,742
Rank Username Points
140
80
78
64
40