07-15-2008 06:25 AM - edited 03-03-2019 10:43 PM
Hi,
Our implmentation uses cbwfq in WAN links.
i did not find the information about queue length when i use fair-queue in class-default.
Any idea?
ps.
the queue limit is used by tail drop.
07-15-2008 06:32 AM
Hi,
The WFQ method can support up to 4096 flows....
A flow is any source ip/dest ip/source protocol/source port/dest port combo.
On VIP and DFC systems you can also specify the queue depth of the individual flows, as per;
http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_d1.html
HTH
LR
07-15-2008 06:37 AM
hi,
We have 7200 platform
we know what flow means.
Are there any limitation for queue length per flow ?
Regards,
07-15-2008 06:46 AM
Hi,
You can increase this using the fair-queue VALUR and you can use the queue-limit command also, to specify when to use tail drop.
Ie fair-queue 100
queue-limit 50
would mean that you could have 100 dynamic WFQ queues and 50 packets limit within each, after this, then the rest get tail dropped.
You could increase this value to max 4096 for dynamic queues, or not use the queue-limit command which would suggest no limit of packets per flow.
HTH
LR
07-15-2008 06:55 AM
hi,
very thanks.
i unterstood the queue-limit command in wfg.
you wrote
which would suggest no limit of packets per flow
is it sure ????
07-15-2008 07:04 AM
Hi,
I dont have access to a box to verify but, looking at the command ref, the congestion discard threshold can be to specify when to drop packets, when configured on the physical interface.
But when using cbwfq then you cant do this.
The best way to check is to issue show service-policy interface x/x when you have applied it, and see what it says.
HTH
LR
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