This document explains about pseudowire status messages: 0x00000001 and  0x00000000

L2circuit is down.

root@Router1> show l2circuit connections



Neighbor: 10.219.0.0

Interface Type St Time last up # Up trans

ps15999.0(vc 99) rmt NP

local PW status code: 0x00000001, Neighbor PW status code: 0x00000000

According to RFC4447, there are below PW Defect Notification Mechanisms

For MPLS and MPLS/IP PSNs, a PE that establishes a PW using the Label Distribution Protocol, and that has negotiated use of the LDP status TLV per Section 5.4.3 of [RFC4447], MUST use the PW status

LDP Status TLV:

[RFC4446] defines the following PW status code points:

0x00000000 - Pseudowire forwarding (clear all failures)

0x00000001 - Pseudowire Not Forwarding

0x00000002 - Local Attachment Circuit (ingress) Receive Fault

0x00000004 - Local Attachment Circuit (egress) Transmit Fault

0x00000008 - Local PSN-facing PW (ingress) Receive Fault

0x00000010 - Local PSN-facing PW (egress) Transmit Fault

[RFC4447] specifies that the "Pseudowire forwarding" code point is used to indicate that all faults are to be cleared. It also specifies that the "Pseudowire Not Forwarding" code point means that a defect has been detected that is not represented by the defined code points.

The code points used in the LDP status TLV in a PW status notification message report defects from the viewpoint of the originating PE. The originating PE conveys this state in the form of a forward defect or a reverse defect indication.