Control Word Reserved bit for use in E-Tree

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Last updated 2012-10-18 (latest revision 2012-04-16)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The extension described in this document allows a pair of PEs connected via an Ethernet Pseudowire (PW) to signal via the use of the Control Word (CW) whether the Ethernet frame encapsulated is coming from a Root AC or a Leaf AC. This allows a PE receiving this frame to decide whether it can be forwarded to a Leaf AC or not. Such forward or drop decision is an additional filtering action after the MAC-based forwarding decision. This applies to both P2P PW and P2MP PW.


Simon DeLord (
Raymond Key (
Frederic JOUNAY (
Wim Henderickx (
Lucy Yong (
Lizhong Jin (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)