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Cisco Bug: CSCsz52950 - ME3400 - inconsistent rate for hw shaper when queue-limit is changed

Last Modified

Feb 22, 2014

Products (61)

  • Cisco ME 3400 Series Ethernet Access Switches
  • Cisco Catalyst 2960-24TC-L Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3560E-48PD-E Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco ME 3400-24TS-A Switch
  • Cisco Catalyst 3750G-12S Switch
  • Cisco Catalyst 3750 Metro 24-AC Switch
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Known Affected Releases

12.2(40)SE 12.2(44)SE 12.2(50)SE

Description (partial)

Symptom:
If the queue-limit is configured on a policy-map with a shaper attached the suggested configurabale rate gets changed.

policy-map test-shaper
 class class-default
    shape average 35000000

lan-me3400-1(config-pmap-c)#int g0/11
lan-me3400-1(config-if)#service-policy output test-shaper
QoS: Configuration failed.  The configured rate 35000000 bps is not achievable in hw within 1% of configuration.
        Closest value(s) are: 36000000 bps, 33333344 bps

Error using the default 160 packet queue  [EXPECTED MESSAGE DUE TO GRANULARITY - THIS IS NOT THE BUG]

========================================

Queue limit is changed to any value (therefore not to default any more)

policy-map test-shaper
 class class-default
    shape average 35000000
    queue-limit 200

lan-me3400-1(config-pmap-c)#int g0/11
lan-me3400-1(config-if)#
lan-me3400-1(config-if)#service-policy output test-shaper
QoS: Configuration failed.  The configured rate 35000000 bps is not achievable in hw within 1% of configuration.
        Closest value(s) are: 33333333 bps, 25000000 bps

Conditions:
Queue-limit is expressely defined.
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