We're doing some Catalyst testing to roll out QoS on our Ethernet
network and have come up against a hurdle. On most of our backbone
links in a MAN, the actual bandwidth between one C/O to another C/O is
not always 100Mbps. There are times when the link is only capable of
hitting say 80Mbps (we're a wireless isp) or less.
Since we have to use a FE port for this type of connection, do the
switches believe that they have 100Mbps of bandwidth to play with when
putting packets into the appropriate queues?
I'm a bit confused as to how the switches work in this fashion. If I
were using CAT5 cables or fiber this would be simple to understand as
the bandwidth would be fixed. :)
This is an example of a configuration on a 3550-24 that I'm using:
interface FastEthernet0/x
mls qos trust dscp
wrr-queue bandwidth 40 35 25 1
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2
wrr-queue cos-map 3 3 4 6 7
wrr-queue cos-map 4 5
priority-queue out
!
The switches that we use are 2950, 3550, 3750 and 6524s.
With MQC and "layer 3" QoS, I would know how to fix this by simply using
the "bandwidth" command on the physical interface and basing my output
policy-map to use "bandwidth percent" for each class. Layer 2 QoS
doesn't seem to work this way though.
Any help would be appreciated.
Thanks.
Jose
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