I'm having trouble with our core switch. Int Vlan 1 and our switchport to our Pop switch are having conflicts. We're using a Catalyst 3750. Here is the abbreviated, edited for content config:
switch 1 provision ws-c3750g-24ts
ip address x.x.x.129 255.255.255.128
ip address x.x.x.33 255.255.255.224
router eigrp xxxx
network x.x.x.32 0.0.0.31
network x.x.x.96 0.0.0.7
network x.x.x.128 0.0.0.127
ip default-gateway x.x.x.1
The errors we are getting come in pairs:
(time): IP-EIGRP(Default-IP-Routing-Table:xxxx): Neighbor x.x.x.33 not on common subnet for Gigabit Ethernet1/0/1
(time): IP-EIGRP(Default-IP-Routing-Table:xxxx): Neighbor x.x.x.129 not on common subnet for Gigabit Ethernet1/0/1
1/0/1 isn't on a VLAN, hence the no switchport command. Yet, it's acting as if it's a VLAN mismatch. VTP Server is setup on the Pop switch, and on the Pop switch, the port to the core is Vlan 1. Any ideas?
Okay i'm confused as to why that affected all your users.
I made vlan 1 passive under the router eigrp config and this stopped the errors as well. But then you may as well just not have an entry for vlan 1 subnet under eigrp.
It does seem to be something specific to vlan 1 because if i remove ip address off vlan 1 and allocate it to either another vlan interface or a routed switchport then the error messages don't appear.
I need to do some debugging. When you tried reassigning vlan 1 ip address to a different vlan interface did you still get the error messages or were you just too busy trying to get your users back !