Tuesday, October 28, 2008

Done with QoS (minus 3560) (notes)

Done with QoS except for QoS on the 3560s since I don't have access to one of these.

Most of the MQC stuff is basic, one gotcha that I should use more often is the match not class-map ABC in another class-map. Comes in handy when having to apply attributes to "everything else".

Priority Queueing and Custom Queueing are setup like access-list (priority-list and queue-list) respectively. and then applied to an interface. Just like an access-list you should have the most specefic match in the beginning and the more general match at the end.
PQ - has 4 queues, high, medium, normal and low
CQ - has 16, of which 15 are usable

WFQ is enabled on the interface fair-queue, hold-queue. WFQ comes in when traffis is set with IP Precedence levels.

If packets are 1500 bytes and the IP Prec is set to 0, then
[32384/(ip prec +1)] x 1500 = size of the packets.
So for IP Prec 0 compared to 1, 1 is half the size of 0 and will receive twice as much bandwidth.

CAR- use acls to specify traffic, you can also use acls with a mask to match only certain IP Prec values Access-list rate-limit 10 mask 7

Policing - if burst is not configured, burst will default to 1/4 the access-rate value.

RSVP- need to review this in doc cd- found under QoS/Signaling.




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