You have multiple Layer 3 VPNs supporting your various customers. Some of the customers use overlapping IP address space. What is used to ensure each customer's prefixes are unique?

The correct answer is D. route distinguisher. A route distinguisher (RD) distinguishes one set of routes (one VRF) from another. It is a unique number prepended to each route within a VRF to identify it as belonging to that particular VRF or customer. An RD is carried along with a route via MP-BGP when exchanging VPN…

Layer 3 VPNs

Question

Options

Aroute target
BMP-BGP
CBGP communities
Droute distinguisher

How the community answered

(37 responses)

A
5% (2)
B
3% (1)
C
14% (5)
D
78% (29)

Explanation

A route distinguisher (RD) distinguishes one set of routes (one VRF) from another. It is a unique number prepended to each route within a VRF to identify it as belonging to that particular VRF or customer. An RD is carried along with a route via MP-BGP when exchanging VPN routes with other PE routers. Incorrect Answers: A: Route targets can be used to share routes.

Topics

#route distinguisher#L3 VPN#overlapping IP#VRF

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