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Question 557 - 300-410 discussion

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How are CE advertised routes segmented from other CE routers on an MPLS PE router?

A.

with a combination of VRF-Lite and MP-BGP

Answers
A.

with a combination of VRF-Lite and MP-BGP

B.

by pushing MPLS labels advertised by LDP on customer routes

Answers
B.

by pushing MPLS labels advertised by LDP on customer routes

C.

by enabling multiple instances of BGP. one for each CE router

Answers
C.

by enabling multiple instances of BGP. one for each CE router

D.

by assigning CE-facing interfaces to different VRFs

Answers
D.

by assigning CE-facing interfaces to different VRFs

Suggested answer: D

Explanation:

In an MPLS PE router, CE advertised routes are segmented from other CE routers by assigning CE-facing interfaces to different Virtual Routing and Forwarding (VRF) instances12. A VRF is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. By associating a network interface with a VRF, the network layer (Layer 3) has a different view of the network topology. This allows the segmentation of routing paths for traffic from different customers or different types of traffic.In the context of MPLS, VRFs are used to create separate routing instances for each customer on a PE router3.

Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) training videos

CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide

Implementing Cisco Enterprise Advanced Routing and Services source documents or study guide

MPLS routes to advertise from CE to PE - Cisco Community

Configuring Route Exchange Between PE and CE Devices - CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - VPN - Huawei

Customer edge router - Wikipedia

asked 07/10/2024
Chuck Crouse
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