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BGP Connector Attribute

This document discusses various tunneling applications proposed within the Border Gateway Protocol (BGP) framework, particularly focusing on the MDT and Tunnel SAFIs for multicast VPNs. It describes how the MDT SAFI facilitates auto-discovery of MDTs and tunnel endpoints, while also detailing the VPNv4 updates that carry specific NLRI formats. The BGP Connector attribute is emphasized for linking tunnel endpoint addresses and enabling efficient route discovery in complex networks. The text outlines essential practices, potential applications, and the importance of the Connector attribute in modern VPN scenarios.

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BGP Connector Attribute

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  1. BGP Connector Attribute IETF 64 Nov 2005

  2. Tunneling applications in BGP • Various Tunneling applications exist or are being proposed in BGP • Some examples are : • The MDT SAFI used for Auto-discovery of MDTs for PIM LAN procedures in Multicast VPNs • The Tunnel SAFI for Tunnel discovery

  3. MDT discovery in PIM-LAN procedures for MVPNs • The MDT SAFI carries • the Tunnel endpoint address in the NLRI of the form RD:Tunnel-address, MDT-group address • Needs an RPF check on the Tunnel-endpoint-address • The VPNv4 update carries • the VPNv4 NLRI of the form RD: IP-address • a BGP Connector attribute of the form Tunnel-address • The BGP Connector attribute for the VPNv4 NLRI links the NLRI carried by the MDT SAFI

  4. Tunnel Endpoint discovery • The Tunnel SAFI carries • the Tunnel endpoint address in the NLRI of the form Tunnel-ID:Tunnel-address • a BGP Tunnel Encapsulation attribute which contains encapsulations and preferences. • The VPNv4 update carries • the VPNv4 NLRI of the form RD: IP-address • a BGP Connector attribute of the form Tunnel-ID:Tunnel-address • The BGP Connector attribute for the VPNv4 NLRI links the Tunnel SAFI NLRI

  5. CE-2 CE-1 CE-2 Host = 1.1.1.1 Host = 2.2.2.2 Tunnel Discovery VPNv4 update RD2:1.1.1 NHOP = PE1 Connector = TunID2:PE1 PE-2 VPNv4 update RD1:1.1.1.1 NHOP = PE1 Connector = TunID1:PE1 PE-1 PE-3 VPNv4 update RD1:1.1.1 NHOP = PE1 Connector = TunID2:PE1 VPNv4 update RD1:1.1.1.1 NHOP = PE1 Connector = TunID1:PE1 CE-3

  6. CE-1 Host = 1.1.1.1 Tunnel Discovery (contd.) VPNv4 update RD1:1.1.1.1 NHOP = PE1 Connector = TunID1:PE1 VPNv4 update RD1:1.1.1.1 NHOP = ASBR-1 Connector = TunID1:PE1 PE-1 PE-2 ASBR-1 ASBR-2 VPNv4 update RD1:1.1.1.1 NHOP = ASBR-1 Connector = TunID1:PE1 CE-3

  7. Summary • The Connector attribute is used for carrying the address of a Tunnel endpoint or an originator in a given network. • Already has 3 applications. • Could have more.

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