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Cisco Bug: CSCvh57121 - When number of egress policers exceeds the limit, TCAM region utilization still shows free entries

Last Modified

Sep 11, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I6(1)

Description (partial)

Symptom:
When using the single-wide TCAM region (e-qos-lite) and the number of egress QoS policers exceeds the limit, this TCAM region utilization still shows free entries available.

For example, if the e-qos-lite is carved to have 256 entries, the limit is 128 policers (see CSCvg87403).
If we'll install more policers and will exceed the limit, the "show system internal access-list resource utilization" and  "show system internal access-list globals" outputs will not reflect this.

In addition, we should throw some meaningful log message when the customer tries to install more policers than supported by his TCAM region size, notifying about the limit and the fact that excessive policers are not in effect.

Conditions:
- Nexus 9300, BCM based (other BCM based N9Ks and N3Ks also may be affected)
- single-wide TCAM region is used for Egress QoS (e-qos-lite, configured via "hardware access-list tcam region e-qos-lite #")
- The number of egress QoS policies applied exceeds e-qos-lite size / 2
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