Hello,

P router doesn’t have Customer network routes where in PE router is having customer network routes. Another reason is P router doesn’t require MP-iBGP but for PE it is must.

Thanks

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MPLS VPN Overview part 1

Created: Jul 22, 2019 08:09:02Latest reply: Jun 12, 2021 22:06:31  1729  0  9  10  0  3View the author #1

Authorized reprint by author zhushigeng (Vinsoney)

I. MPLS VPN architecture

1. Provider edge (PE) device

A PE is a carrier border device that is connected to a customer edge device. PEs must support MPLS. On the PEs, VPN instances are used to isolate different VPN clients. A PE runs a routing protocol with a CE to obtain customer routes, generates a VPNv4 prefix for each route, and sends the VPNv4 prefixes to the peer PE through the MPLS VPN backbone network.

2. Provider (P) device

A P is a carrier device that is indirectly connected to a customer device. The P supports MPLS. The P is unaware of VPN customer networks or customer routes. The P is only responsible for carrying labeled data within the backbone network.

3. Customer edge (CE) device

On a customer network, a CE is directly connected to a PE. The CE advertises routes of VPN clients to the PE and learn routes of the other sites in the same VPN instance from the PE.