MPLS over GRE Tunnels

[efairbanks]

Is there an article anywhere showing a config for MPLS over GRE tunnels? I need to do this with 3725s... Thank you.

[Harold Ritter]

You simply need to configure a GRE tunnel and add "mpls ip" on the tunnel.

int tunnel 0

ip address 192.168.1.1

tunnel destination 2.2.2.2

tunnel source 1.1.1.1

mpls ip

Hope this helps,

[efairbanks]

Hritter,

Do all routers in the path need to run some kind of IGP to pass label information? I am still having problems with nonadjacent BGP peers not sending MPLS tags. Also, when I type "sho ip bgp label" nothing is returned.

[Harold Ritter]

The routers between the tunnel endpoints need to be able to resolv tunnel endpoints only (no ldp required).

Try "show ip bgp v a labels" to see the labels for VRF prefixes.

Hope this helps,

[q-coelho]

hi,

You will need an IGP that knows how to find the remote tunnel end points as well as IGP running over the tunnels to find the BGP neighbours.