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Cisco Bug: CSCte43884 - SBC large number of ping enabled tcp adj w/o peer causes buffer congest

Last Modified

Jan 28, 2017

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)


SBC enters into congestion and periodically displays "Buffer congestion" log. SBC drops some incoming calls in this state.

Also, a lot of outbound buffers are being consumed and held and thus
occasionally leading to various levels of SIP buffer congestion. 


When a large number of options ping enabled TCP adjacencies exist and these point to no real peer, the TCP connection never comes up. SBC attempts to setup TCP connection (to the non-existent peer) and send an options ping message.  The connection does not come up and options ping fail.
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