Vrf-Lite with MPLS requires a PE at the customer side?
Looking at a cisco doc, which gives a sample configuration of VRF lite with MPLS (multiple customers in the same building using same MPLS cloud). My question is that how is it done in the real world. Does the provider place a PE at the customer site? cause the connection between the CE and PE has to be a link that can carry dot1Q (ethernet or fast etheret) atleast the example shows that.
Any real world experience would be highly appreciated.
Re: Vrf-Lite with MPLS requires a PE at the customer side?
the customer needs no PE router installed at his site.
You can use vrf-lite (aka multi-vrf) even on a Cisco router, which does not support MPLS at all. On the CE each dot1Q subinterface can be placed in a vrf. All you need is a routing process started within the vrf being adjacent to the PE.
ip vrf CE-VRF1
encapsualtion dot1Q 100
ip vrf forwarding CE-VRF1
ip address 10.1.1.1 255.255.255.0
router ospf 100 vrf CE-VRF1
network 10.1.1.1 0.0.0.0 area 1
The PE would have MBGP and different RD and RTs defined, whatever is needed to setup VRFs in the provider network. Infact PE and CE each do not know about each others VRF configs at all.
VRFs on the CE define a separate IP routing context (control plane). The separation on the data plane is done via dot1Q headers (frame-relay, ATM PVC etc. would do as well) on the link between CE and PE. In an MPLS network data plane separation is done via labels.
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