MPLS - Frame Relay

[maryodriscoll]

Hi

I am trying to understand the build we have on our CE routers from the Service Provider. Frame-relay encapsulation is build on the Wan interface with LMI configured/dlci enabled on sub-interface. At the PE end, there is also Frame-relay configuration on the PE end...How does that work? Does Cisco have any docs that I could read?

[Giuseppe Larosa]

Hello Mary,

on the PE router there is a Frame-relay interface and sub-interfaces.

the PE-CE link is the VRF access link what is different on the PE side is the presence of the command ip vrf forwarding VRF-name in the correct FR subif.

Then the MPLS cloud includes the backbone links of the PE routers.

see the following link for an introduction to MPLS VPN

http://www.cisco.com/en/US/docs/net_mgmt/vpn_solutions_center/1.2/provisioning/user/guide/VPN_UG1.html

Hope to help

Giuseppe