cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
499
Views
0
Helpful
1
Replies

using a vrf ospf process without super backbone on c3750?

avantheemsche
Level 1
Level 1

Hi

We have 2 completely different networks which we want, at a certain location, to bring physically on 2 (redundant) c3750's.

1 of the 2 networks was already on those switches, and participates in ospf (as a stub area).

So when the second network came, we created a vrf, and a vrf ospf process (which initially participated in area 0 of the other network). Everything worked fine. We didn't change anything of the config of network 1 (so didn't define any vrf's for the ospf process or interfaces).

Now we decided that the location of network 2 (the new one, in a vrf) should no longer be in area 0, but should be a totally stub area, with no config of area 0 on that site). This is were the problems began. The  configuration didn't put a default gateway in the VRF's routing table ( that is injected by the ABR on another location). on further inspection we saw why.

It seems that an ospf process in a vrf is asuming there is a MPLS VPN superbackbone

(from sh ip ospf)

Connected to MPLS VPN Superbackbone, VRF internet
It is an area border router

so this ospf process made itself ABR, ignoring information from area 0 coming via a non-backbone area).

my question is rather simple... Can i prevent this ospf process (running in a VRF) from becoming ABR?

kind regards

Arne

1 Reply 1

Peter Paluch
Cisco Employee
Cisco Employee

Hi Arne,

Yes, it should be possible - try using the command capability vrf-lite in the OSPF process run in the VRF. That should prevent it from considering itself to be an ABR.

If this does not work then please be so kind as to provide a quick picture of your network, including the current configuration of your OSPF processes on the device having the VRF table.

Best regards,

Peter

Review Cisco Networking for a $25 gift card