QoS Class Default

[jefbowli]

I am trying to set up QoS specifically CBWFQ.  My question is "is it correct if the traffic doesn't match any Queues traffic will be placed in Class-default?"

I guess this is like the permit ip any any at the end of an access-list.  I don't want the traffic to not match a queue and be dropped because of it.  Would the following config work?

class-map match-all sttx

  match vlan 543

policy-map policy1

  class sttx

    bandwidth 100000   <-- Hundred megabytes

int fa1/0

service-policy output policy1

[John Blakley]

Correct. You won't drop any traffic, but whatever doesn't match in any class does fall under the class-default. Your current config guarantees 100Mb of bandwidth to vlan 543, but if vlan 12 were to come in it doesn't guarantee anything for 12 and will just match on the class-default.

HTH,
John

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[Joseph W. Doherty]

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Posting

Yes, any unmatched traffic goes to the class-default class.  This class is always present, even when not explicitly defined.