From: Brian Landers (brian@bluecoat93.org)
Date: Fri Sep 26 2008 - 12:01:51 ART
Thanks for the quick reply, Petr! So does that mean if I have the following
config:
mls qos
int fa0/4
speed 100
srr-queue bandwidth limit 10
priority-queue out
!
... my queue 1 traffic will be guaranteed 2.5mb of bandwidth (25%, the
default)?
On Fri, Sep 26, 2008 at 10:52 AM, Petr Lapukhov <petr@internetworkexpert.com
> wrote:
> Hi,
>
> On the 3560 platfor, you can use the command "srr-queue bandwidth limit" to
> enforce interface-wide shaping (it actually is shaping, since it delays
> packets). Combined with speed manipulation (10/100/1000) you can "shape"
> interface to as little as 1Mbps (with some granularity for speed values, of
> course).
>
> At the same time, you can configure the use of SRR queues (either in shaped
> or shared modes) with this feature. In effect, this allows implementing
> hierarchical shaping, with per-interface shaped rate combined with per-queue
> shaping.
>
> Of course, there are just four-queues and therefore four aggregate traffic
> classes. But this is the price you have to pay for the high switching
> performance! :)
>
> HTH
>
>
> 2008/9/26, Brian Landers <brian@bluecoat93.org>:
>>
>> Hi all,
>>
>> I have two 3560's connected by Metro Ethernet. The MetroE is policed to
>> 10mb by the service provider, but delivered as 100/full on copper. Thus,
>> as
>> far as my switches know, they're connected by a 100mb link.
>>
>> Here's the tricky part: I need to do some fun QoS stuff like priority
>> queuing, WRD, and class-based fair-queuing across this link, based on the
>> 10mb CIR. Currently, since the hardware queues never fill up, the queuing
>> and WRD never kick in. Is there a way to force the 3560 to use a
>> different
>> value for its "start queueing now" water mark?
>>
>> Yes, this is technically off-topic for the CCIE list, but it seems like
>> this
>> is just the kind of scenario someone evil like Scott would come up with
>> for
>> a question: "R1 and R2 are connected by 100mb ethernet. Pretend it's
>> only
>> 10mb and implement WRD"
>>
>> Thanks,
>> Brian
>>
>>
>>
>>
>>
>>
>
>
>
>
-- Lock the last open door; the ghosts are gaining on me.Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Sat Oct 04 2008 - 09:26:19 ART