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Cisco LAN Switching Fundamentals by Basir Sakandar - CCIE No. 6040, David Barnes - CCIE No. 6563

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QoS Caveats

Caveats regarding QoS and the Catalyst 6500 switch include the following:

  • Etherchannel— Etherchannel ports require identical QoS configurations on the individual ports.

  • IGMP snooping— QoS does not support IGMP traffic, if IGMP snooping is enabled on the switch.

  • MSFC— Any traffic sourced from MSFC to the egress port has a CoS value of 0.

  • Flexwan— Traffic incoming from a Flexwan module has its CoS value always set to 0.

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