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Cisco Bug: CSCuq01572 - ASR1K:SPA-4XT-SERIAL System hang due to zero clock on DTE

Last Modified

Sep 17, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S

Description (partial)

Symptom:
System hangs when QFP memory is exhausted due to buffer build up at interface level and SIp level.

Conditions:
When any ports on the serial spa present on the chassis are connected to a remote equipment that is not transmitting any clock (This can be verified by the command "show controller serial <slot/subslot/port>" then this may result in buffer fill up at interface level and SIP level.

When the output of teh above command displays 0 rx clock and the interface is admin up state(protocol down) then there is a risk of buffer build up.

This is applicable only for the SPA SPA-4XT-SERIAL. and no other SPAs.
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