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Need a way to update the PW interface parameters without service disruption Requirement Signaling the update in the control plane Synchronizing the update in the data plane (The Length field of CESoPSN PW packet is not sufficient to correctly restitute the traffic over the AC, see next slides) Proposal Control plane: new LDP mapping message with a PW Update sub-TLV To be included to the LDP Label Mapping initiated to update the PW To indicate the update behavior of the new LDP mapping Backward compatibility: otherwise the new LDP message is usually dropped since an existing label has already been assigned to this FEC Data plane: in-band detection based on the new label assignment Required to allow the egress PE to forward over the AC the received traffic with the new format CESoPSN Update Solution Overview |