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Cisco Bug: CSCur20842 - multiple match criteria should not be allowed on EC member ports

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)

4500 SUP8-E accepts unsupported configuration of QoS on Etherchannel physical member ports
which causes unbundling of members due to incompatibility and thus loss of connectivity.

1. configure class-maps matching on one of these types of fields (DSCP/Precedence/COS/non-marking fields)
2. configure policy-map that references these class-map
3. apply service-policy to Etherchannel physical member ports
4. modify class-map referenced in policy-map applied to Etherchannel physical member ports to match
   on combination of one MORE fields (DSCP/Precedence/COS/non-marking fields) rather than 1.
(at that time, two types of fields configured at the class-map)
5. cause Etherchannel physical member ports to go down and then up (shutdown -> no shutdown on either end or cable disconnect)
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