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Cisco Bug: CSCus87139 - AIS Sent on CESoPSN E1 even after L-bit Cleared by Remote PE

Last Modified

Feb 21, 2018

Products (1)

  • Cisco ASR 900 Series Aggregation Services Routers

Known Affected Releases

15.5(2)S

Description (partial)

Symptom:
On an ASR903 or ASR920 head-end router, E1 controller corresponding to a CESoPSN circuit may continue to transmit AIS alarm even after the alarm condition has been cleared on the remote PE.

Conditions:
The E1 is configured with CESoPSN with "forward-alarm ais".
E1 on Remote CE is shut, resulting in AIS transmission over the E1 at the local head-end.
The CESoPSN VC is flapped.
E1 on remote CE is "no shut".
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