[c-nsp] Cat 6500 and QoS for lower bandwidth

[Mikael Abrahamsson]

On Tue, 18 Jun 2013, Grischa Stegemann wrote:

> Thus there is no way to achieve something like a shaping down to 5MBit/s 
> AND considering the dscp/cos-classes at the same time.

You should look into "wrr-queue shape", but it's not on the cards you 
mentioned.

<http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_538840.html>

6.5.4. Shaped Round Robin
SRR is a recent addition to the scheduling capabilities of the Catalyst 
6500 family. SRR is currently available only on egress and only on the 
WS-X6708, the WS-X6716, the uplink ports of the Supervisor 32 and 
Sup720-10GE. SRR is different to WRR in that the SRR algorithm provides a 
way to shape outbound traffic to a stated rate. In some respects, it is 
similar to a policer except that traffic in excess of the rate will be 
buffered rather than dropped as with a policer.
SRR is configured by adding the keyword shape to the queue configuration 
and can only be configured if the priority queue is not used (no COS is 
associated with the priority queue)
This is the CLI used to configured SRR on the uplink of the Sup720-10GE
Cat6500(config-if)#int ten 5/4
Cat6500(config-if)#wrr-queue shape 100 150 200

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se