10-27-2011 07:50 AM - edited 03-07-2019 03:05 AM
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
10-27-2011 09:03 AM
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
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