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Cisco Bug: CSCta42753 - following reload on SIP400 OC3 POS with APS LAIS alarm is getting stuck

Last Modified

Jan 31, 2017

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases


Description (partial)

Symptoms: Following reload or reseat of Protect LC in ADM TRuepointR 6400,
SPA-2OC3-POS/SIP400/SRD2 reports "Received Alarm: L-AIS" on the PROTECT port
of a 1+1 APS group when an inline SONET analyzer attached to same wire
reports no L-AIS is present on the wire. 

Conditions: L-AIS is recovered by an STE via looking for K2 = 0x07 for 5
consecutive frames.

A Cisco POS interface with "pos ais-shut" will transmit L-AIS when
interface is shutdown. Without "pos ais-shut" the interface continues to
send valid SONET frames toward the STE/LTE.
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  • Status
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