VRF across L3 switch link

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Oct 5th, 2007
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I have two 3560s connected via a Layer 3 portchannel. I have two vlans on switch A and one VLAN on switch B that i want to be in the same VRF. The rest of the VLANs on both switches i dont want in a VRF...

Im using OSPF for VRF and non VRF router advertisements...

how can i do this with an L3 link connecting the two switches?


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royalblues Sat, 10/06/2007 - 01:09
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If i understand you correctly, i think you can have the desired vlans with the same RT & RD values and enable VRF FWD on those particular vlan SVI's?


nikolasgeyer Sun, 10/07/2007 - 21:36
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If it is VRF lite, the easiest way would be to crate a GRE tunnel between the two switches and put it in your VRF. So assuming each switch has a Loopback address of and it would look as follows;

interface Tunnel1

description VRF Link between switches

ip vrf forwarding VRF_NAME

ip address

tunnel source Loopback0

tunnel destination


router ospf xxxx

address-family ipv4 vrf VRF_NAME

network area 0


That would create a L3 link across the GRE tunnel in your VRF and allow OSPF to establish a neighbor for that particular VRF.

Then just place the VLAN SVI's into your vrf;

interface Vlan100

ip vrf forwarding VRF_NAME

If you previously had an IP address assigned to the SVI, you will need to reassign it after putting it in a VRF.


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