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Cisco Bug: CSCtc01377 - ISG rate limiting is imprecise above 1.5 Mbps

Last Modified

Feb 22, 2014

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


QoS policing is reported applied to the session OK, but when the average limit is set to 4 Mbps the subscriber is able to pass traffic at up to 6 Mbps:

     Traffic class session ID: 53
      ACL Name: BW_METER, Packets = 0, Bytes = 0
After 15 seconds
     Traffic class session ID: 53
      ACL Name: BW_METER, Packets = 7031, Bytes = 9466099

the average rate being ca. 5.05 Mbps therefore.

The problem appears to affect equally the upstream and the downstream directions.


The policing still works correctly for data rates up to ca. 1.5 Mbps.
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