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Cisco Bug: CSCvu04665 - CUBE keeps sending REINVITES to peer legs leading to high CPU and eventually crashes.

Last Modified

Aug 29, 2020

Products (44)

  • Cisco IOS
  • Cisco Catalyst 9400 Supervisor Engine-1XL-Y
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Embedded Wireless Controller on Catalyst 9120AX Access Points
  • Cisco Catalyst 9130AXE Access Point
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Known Affected Releases

16.12.3 16.9.5

Description (partial)

Symptom:
1. Multiple REINVITES triggered by CUBE in a loop towards both peer legs. Each 200OK response from peer-leg leads to the generation of a REINVITE on the other leg.

Sample call-flow: IP phone -- sip -- CUCM -- sip -- CUBE -- sip -- server-group -- ITSP SBC 1 and ITSP SBC2

2. High CPU in CCSIP_SPI_CONTOL process:

qwerty#show processes cpu sorted | ex 0.0
CPU utilization for five seconds: 94%/0%; one minute: 33%; five minutes: 13%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process 
 732      162116       48235       3360 66.10% 22.00%  5.29%   0 CCSIP_SPI_CONTRO           
 734       14420       38068        378  1.68%  0.59%  0.13%   0 CCSIP_UDP_SOCKET 

Will also see an abnormal values for message rate but CPS will not increase paralelly. Outputs to check:

show sip-ua history stats message-rate table
show call history stats cps table


Router can just crash as well depending on the original call volume.

Conditions:
This scenario is hit only when the following conditions are true:

1. Server groups are configured on outgoing dial-peer.
2. Element 1 (chosen by server-group) sends a 18X w/sdp followed by 4xx/5xx msg.

Without a 18x msg with SDP received from element 1, CUBE will not trigger REINVITES post call-connect.
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Bug Details Include

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