OSPF-4-ERRRCV errors on networks that have the same VLAN interface name

[htacisocnet]

I have two 3850 switches running OSPF which for the most part is working just fine, except switch B is logging the following errors:

340231: Nov 10 09:46:46: %OSPF-4-ERRRCV: Received invalid packet: mismatched area ID from backbone area from 172.16.60.1, Vlan60

 Vlan 60 exist on both switches, defined with different networks.  On switch A the VLAN is in area 0, on switch B, the VLAN area in area 15.    There are other networks that are defined within OSPF on both switches that aren't producing this error.  I can recreate the situation anytime the networks share the same vlan interface name.  Thoughts, suggestions?

Switch A:

router ospf 1
router-id 10.10.10.2
network 10.10.40.0 0.0.0.255 area 0
network 172.16.60.0 0.0.0.63 area 0

interface Vlan60
ip address 172.16.60.1 255.255.255.192
end

Switch B

router ospf 1
router-id 10.10.40.2
network 10.10.40.0 0.0.0.255 area 0
network 10.15.0.0 0.0.255.255 area 15
!

interface Vlan60
ip address 10.15.60.1 255.255.254.0
end

[Jon Marshall · Accepted solution]

How are the switches interconnected ?

If it is a trunk allowing vlan 60 then you will see this because you are extending the vlan between the switches.

If it is a L3 interconnect you shouldn't see this because vlan 60 is unique to each switch.

Jon

[htacisocnet]

Jon,

The switches are connected via trunk with was allowing all vlans.  I changed it on both side to only allow the network used for connecting the two switches and then the errors stopped.

Thanks,

Pat

[paul driver]

Hello

do they need to be peering via this vlan or just advertising the network

if so ou can passive the svi interface to negate adjacency

res

paul