I need some help in configuring MPLS over GRE tunnels. I did not find any proper configuration example to help me. I need to do this for encrypt the traffic between two PE routers. I have 7609 routers.
The same configurations of regular IP over GRE should be applied over physical interfaces, once the tunnel get ip, establish your routing protocol and LDP over the tunnel interface, based on the MPLS application you gone use decied the maximum number of labels will be included in one packet (4 bytes per label) then add the 24 GRE header and adjust your MTU.
I understand. But, I really don't know how can I configure. I tray something but it isn't working.
I cannot establish the MP-BGP session over my GRE tunnel. I made the GRE tunnel and I put the GRE interface into one VRF.
I'm a little bit lost and I need a configuration example to have a starting point.
one thing is to have a GRE tunnel as a VRF access link, another different matter is to use the GRE tunnel as your backbone link between PE routers.
in a few words to support MPLS forwarding and signaling you enable MPLS into the tunnel interface with mpls ip command.
interface tunnel 12
tunnel source <local PE pub ip address>
tunnel destination < remote PE pub ip address >
ip address 10.x.y.1 255.255.255.252
! some mtu fixing may be necessary
ip address 172.16.12.1 255.255.255.255
an IGP running over 10.x.y.0/30 + mpls ldp router-id loop5 or change mpls source on the tunnel
router ospf 12
network 10.x.y.0 0.0.0.3 area 0
network 172.16.12.1 0.0.0.0 area 0
router bgp 12
neighbor 172.16.12.2 activate
neighbor 172.16.12.2 update-source loop5
neigh 172.16.12.2 send-community both
the public ip addresses are different from 10.x.y.0/30 and 172.16.12.x and must be known / advertised
public ip addresses mustn't be advertised over IGP running over GRE tunnel (try and see what happens ...)
hope to help
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