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Cisco Bug: CSCvj10951 - RF management traffic overutilization

Last Modified

Aug 10, 2018

Products (1)

  • Cisco cBR Series Converged Broadband Routers

Known Affected Releases

15.6(2)SP

Description (partial)

Symptom:
Current management traffic rate can be found out by subtracting User traffic rate (Mbps) from total MPEG traffic rate (Mbps) from 'show controller integrated-Cable <  > counter rf-channel' .   It appears CBR8 is sending 4 to 10Mbps more management traffic than it requires.

For instance, from following example, only four upstream channels are configured for 6/0/0 and management traffic rates for RF channel 1 and 15 are 14.47 Mbps (32.21 - 17.74==14.47) and  14.13Mbps (37.91 - 23.78 == 14.13) respectively. 

In compared with other interfaces that are having four upstream channels  and showing around 4 to 5 Mbps of normal management traffic rate, around 10Mbps of more management traffic is being sent on 6/0/0.

CBR8#show controllers integrated-Cable 6/0/0  counter rf-channel
 
Controller  RF    MPEG       MPEG        MPEG   Sync       MAP/UCD    User
            Chan  Packets    bps         Mbps   Packets    Packets    Mbps
                  Tx                            Tx         Tx
6/0/0       1     336355185113 32218817   32.21   2609065148 78001856960 17.74
6/0/0     15    220927364727 37917945   37.91   1296173526 51843147291 23.78

Conditions:
Many UGS-AD service flows. And the upstream channel is busy. Swtich UGS-AD service between UGS-AD poll and UGS-AD grant frequently.
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