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Do Layer-3 MPLS VPNs need to have BGP-4 support?

In this Ask the Expert response, VPN expert Rainer Enders explains why BGP-4 support is necessary when configuring a router for a Layer-3 MPLS VPN.

Before configuring a router for a Layer-3 MPLS VPN, does it need to have BGP-4 support?

L3 multiprotocol label switching (MPLS) VPNs are based on routing tables . They use standard routing protocols, such as BGP, to create route maps and use various add-ons and extensions for the purpose of the L3 VPN, such as route distinguishers and route targets to differentiate and properly handle routes and destinations.

The multiprotocol extensions of BGP used for MPLS VPN services are only defined for BGP-4 as far as I know. So BGP-4 support would be required.

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This was last published in February 2012

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