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Question 49 - JN0-664 discussion

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You are configuring a BGP signaled Layer 2 VPN across your MPLS enabled core network. In this scenario, which statement is correct?

A.
You must assign a unique site number to each attached site's configuration.
Answers
A.
You must assign a unique site number to each attached site's configuration.
B.
This type of VPN only supports Ethernet interfaces when connecting to CE devices.
Answers
B.
This type of VPN only supports Ethernet interfaces when connecting to CE devices.
C.
This type of VPN requires the support of the inet-vpn NLRI on all core BGP devices
Answers
C.
This type of VPN requires the support of the inet-vpn NLRI on all core BGP devices
D.
You must use the same route-distinguiaher value on both PE devices.
Answers
D.
You must use the same route-distinguiaher value on both PE devices.
Suggested answer: C

Explanation:

BGP signaled Layer 2 VPN is a type of VPN that uses BGP to distribute VPN labels and information for Layer 2 connectivity between sites over an MPLS network.BGP signaled Layer 2 VPN requires the support of the l2vpn NLRI on all core BGP devices1. The l2vpn NLRI is a new address family that carries Layer 2 VPN information such as the VPN identifier, the attachment circuit identifier, and the route distinguisher.The l2vpn NLRI is used for both auto-discovery and signaling of Layer 2 VPNs2. In this scenario, we are configuring a BGP signaled Layer 2 VPN across an MPLS enabled core network. Therefore, we need to ensure that all core BGP devices support the l2vpn NLRI.

asked 18/09/2024
Giuseppina Mancinelli
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