The following table lists the CES pseudowire alarm conditions detected and generated in the E4G node with the suggested remedies.
CES Pseudowire Alarms and Remedies
| Alarm | Description | Remedy |
|---|---|---|
|
Local L-bit (Local attachment circuit Rx fault) |
This condition occurs when the TDM port in attachment circuit of the CES pseudowire is in failure state or is administratively disabled. When the TDM port is in LOS, AIS or LOF condition, the local end of the CES pseudowire carries the L-bit in the control word as an indication of the local attachment circuit alarm to the remote end of the pseudowire. This condition can be induced by disabling the TDM port administratively. This condition applies for both SAToP and CESoP pseudowires. |
The alarms associated with the TDM port in the attachment circuit of the CES pseudowire can be referred. The L-bit condition is cleared when the associated TDM port is restored from the failure state. |
|
Local R-bit (Local pseudo-wire LOSY state) |
This condition occurs when the local end of the CES pseudowire enters the LOSY state. The CES pseudowire enters LOSY state when the packets from the remote end of the CES pseudowire are lost in the transit. The local end of the CES pseudowire carries the R-bit in the control word as an indication of the remote pseudowire fault. The CES pseudo-wire stream from the remote end, carrying L-bit would result in LOSY state in the local end of the CES pseudowire. Administratively disabling the CES pseudo-wire in the local end would result in the LOSY state in the remote end of the CES pseudo-wire. This condition applies for both SAToP and CESoP pseudowires. |
If this condition occurs and the CES pseudowire is not disabled, the reachability of the CES pseudowire peer needs to be checked. If the peer is reachable, occurrence of remote end attachment circuit fault (remote L-bit condition) could be referred to. The R-bit condition is cleared when the remote CES pseudowire packets are received. |
|
Local M-bit (Local attachment circuit Tx fault) |
This condition occurs when the TDM port in the attachment circuit of the CES pseudowire receives remote alarm indication (Rx RAI). The local end of the CES pseudowire carries M-bit in the control word to indicate the remote end of the CES pseudowire, of the reception of RAI in the local attachment circuit. This condition applies for CESoP pseudo-wires only. |
If this condition occurs, the alarms associated with the TDM port in the attachment circuit of the CES pseudowire can be referred. The M-bit condition is cleared when the associated TDM port stops receiving RAI indication. |
|
Remote L-bit (Remote attachment circuit Rx fault) |
This condition occurs when the TDM port in attachment circuit of the remote CES pseudowire is in failure state or is administratively disabled. The remote end of the CES pseudowire carries the L-bit in the control word to the local end of the CES pseudowire as an indication of the attachment circuit alarm in the remote end of the CES pseudo-wire. This condition can be induced by disabling the TDM port in the remote end of the CES pseudowire administratively. This condition applies for both SAToP and CESoP pseudowires. This condition causes AIS or trunk conditioning pattern to be transmitted on the local attachment circuit. |
If this condition occurs, the TDM port/attachment circuit alarms in the remote end of the CES pseudowire can be referred. The L-bit condition is cleared when the TDM port in the remote end of CES pseudowire is restored of the failure state. |
|
Remote R-bit (Remote attachment circuit LOSY state) |
This condition occurs when the remote end of the CES pseudowire enters the LOSY state. When the packets from the local end of the CES pseudowire are lost in transit the remote end of the CES pseudowire enters LOSY state. This condition also occurs when the local end of the CES pseudowire carries L-bit to indicate the remote end of the CES pseudo-wire, of the fault in the local attachment circuit. When the local end of the CES pseudo-wire is administratively disabled, the remote end of the CES pseudo-wire enters LOSY state. This condition applies for both SAToP and CESoP pseudo-wires. |
If this condition occurs and the remote end of CES pseudowire is not disabled, occurrence of the local end attachment circuit fault (local L-bit condition) could be referred to. If local end of CES pseudowire does not carry L-bit, the reachability of the local peer from the remote end of the CES pseudo-wire needs to be checked. The R-bit condition is cleared when the local CES pseudo-wire packets are received in the remote end. |
|
Remote M-bit (Remote attachment circuit Tx fault) |
This condition occurs when the TDM port in the attachment circuit of the remote CES pseudowire receives remote alarm indication (Rx RAI). The remote end of the CES pseudowire carries M-bit in the control word to the local end as an indication of the RAI reception by the attachment circuit. This condition applies for CESoP pseudo-wires only. This condition causes RAI to be transmitted on the local attachment circuit. |
If this condition occurs, the alarms associated with the TDM port in the attachment circuit of the remote CES pseudo-wire can be referred. The M-bit condition is cleared when the associated TDM port stops receiving RAI indication |
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