Multi-Segment Pseudowire Setup and Maintenance using LDP

Document Type Expired Internet-Draft (individual)
Author Florin Balus 
Last updated 2005-07-18
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


[MS PWE3 Requirements] describes the requirements to allow a service provider to extend the reach of pseudo-wires across multiple domains. A Multi-Segment PW is defined as a set of two or more contiguous PW segments that behave and function as a single point- to-point PW. The current specification of the PW Architecture [PW ARCH] defines the PW as a single Segment entity, connecting the Attachment Circuits between two Ultimate PEs (U-PE). The current procedures for establishing a single segment PW (SS-PW) is described in [PW Control], where typically an LDP session is established between the ultimate PEs handling the Pseudowire End Service (PWES). No intermediate nodes, between the PEs, are aware of the PW. The purpose of this draft is to specify new LDP extensions, end to end signaling procedures to address the related requirements specified in [MS-PWE3 Requirements]. The proposed procedures follow the guidelines defined in [RFC3036bis] and enable the usage of addressing schemes (L2FECs) and other TLVs already defined for PWs in [PW Control]. The solution described in the draft provides a MS-PW Operational Model, Signaling Procedures consistent with the regular (SS-)PWs, in order to enable seamless implementation, deployment. The resulting MS-PW building blocks accommodate and enhance LDP-VPLS, VPWS solutions with minimal changes in the Information Models and Software Modules related to the L2VPN functionality.


Florin Balus (

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