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BGP Connector Attribute
IETF 64 Nov 2005
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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
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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
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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
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Tunnel Discovery PE-2 CE-2 CE-2 PE-1 CE-1 PE-3 CE-3 VPNv4 update
RD2:1.1.1 NHOP = PE1 Connector = TunID2:PE1 PE-2 VPNv4 update RD1: NHOP = PE1 Connector = TunID1:PE1 CE-2 Host = CE-2 PE-1 CE-1 Host = PE-3 VPNv4 update RD1:1.1.1 NHOP = PE1 Connector = TunID2:PE1 VPNv4 update RD1: NHOP = PE1 Connector = TunID1:PE1 CE-3
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Tunnel Discovery (contd.)
VPNv4 update RD1: NHOP = PE1 Connector = TunID1:PE1 VPNv4 update RD1: NHOP = ASBR-1 Connector = TunID1:PE1 PE-1 PE-2 ASBR-1 ASBR-2 VPNv4 update RD1: NHOP = ASBR-1 Connector = TunID1:PE1 CE-1 Host = CE-3
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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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