Provisioning Models and Endpoint Identifiers in L2VPN Signaling

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Last updated 2003-05-06
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[PWE3-CONTROL] specifies a 'signaling protocol' which uses extensions of LDP [RFC 3036] to set up and maintain pseudowires [PWE3-FR, PWE3- ARCH]. Like any protocol which sets up connections, the signaling protocol provides a method by which each endpoint can identify the other. [L2VPN-FW] describes a number of different ways in which sets of pseudowires may be combined together into 'Provider Provisioned Layer 2 VPNs' (L2 PPVPNs, or L2VPNs), resulting in a number of different kinds of L2VPN. Different kinds of L2VPN may have different 'provisioning models', i.e., different models for what information needs to be configured in what entities. Once configured, the provisioning information is distributed by a 'discovery process', and once the information is discovered, the signaling protocol is automatically invoked to set up the required pseudowires. The semantics of the endpoint identifiers which the signaling protocol uses for a particular type of L2VPN are determined by the provisioning model. This document specifies a number of PPVPN provisioning models, and specifies the semantic structure of the endpoint identifiers required. It further specifies how the endpoint identifiers are carried in the 'Generalized Identifier FEC' of [PWE3-CONTROL]. It is believed that the specified identifiers can also be carried within the L2TP signaling protocol, though this is currently not specified.


Eric Rosen (
Vasile Radoaca (

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