What is the role of the BGP protocol in CE-to-PE communication?

The correct answer is B. It performs routing and label forwarding. When BGP runs between the CE and PE, it not only exchanges VPN routes but also carries the associated MPLS labels as part of the MP-BGP NLRI. This lets the PE learn customer routes and the labels used to forward their traffic across the MPLS backbone.

Layer 3 VPNs

Question

Options

AIt performs label exchange only.
BIt performs routing and label forwarding.
CIt performs IPv6 route exchange with label forwarding only.
DIt performs IPv4 and IPv6 route exchange.

How the community answered

(53 responses)

A
2% (1)
B
94% (50)
C
4% (2)

Explanation

When BGP runs between the CE and PE, it not only exchanges VPN routes but also carries the associated MPLS labels as part of the MP-BGP NLRI. This lets the PE learn customer routes and the labels used to forward their traffic across the MPLS backbone.

Topics

#BGP#CE-PE routing#label forwarding#VPN

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