[c-nsp] Catalyst 6524 rate limit per port/vlan

[John Gill]

Hi Pavel,
Every hardware-enabled platform needs features designed into the 
capabilities of the ASICs, so it's not necessarily a question of 
difficulty, but just that the ability wasn't built into PFC QoS.

If you look at the ES20 modules for example, you will see that 
functionality is available on those cards (average rate traffic 
shaping).  Interestingly, the ability to rate-limit egress is also 
fairly flexible on 3560/3750.  Not to the extent that you could do 
dual-bucket policers or anything, but you can provide a % of line rate 
to transmit, and the rest of the time slots the mac is idle.

I would say this type of feature would be more useful in the SP arena 
Most 6500's are used in the enterprise, so the ability to perform egress 
shaping would have been determined to be less desirable in favor of some 
other feature set.  I didn't design the box, just food for thought.

Regards,
John Gill

On 5/29/11 5:34 PM, Pavel Dimow wrote:
> Hi Mark,
>
> thank you for your suggestion. I still can't figure out whats so
> specific and difficult about egress rate limit?
> Everyone seams to offer ingress rate limit but egress is very rare and
> results vary.
>
>
> Maybe someone from Cisco can shed a little light on this? :)
>
>
> On Wed, May 25, 2011 at 3:48 AM, Mark Tinka<mtinka at globaltransit.net>  wrote:
>> On Saturday, May 21, 2011 05:32:24 AM Pavel Dimow wrote:
>>
>>> I'am thinking of using CAT6524 as access switches for our
>>> pure l2vpn customers. I have started reading about rate
>>> limiting capabilities of those switches but it I can't
>>> find a way to do a per port or per vlan rate limit. With
>>> MQC I can limit the speed in inbound but not in outbound
>>> direction. Is there any better way to do it? I don't
>>> understand what is the problem with
>>> outbound rate limit for Cisco (and Juniper) switches? Is
>>> it architecture or something else and how come that
>>> there is no problem for rate limit on routers (even the
>>> smallest one).
>>
>> I would look at Cisco's ME3600X/3800X for this deployment. I
>> wouldn't waste my time on an ME6524, given the capabilities
>> and price of the ME3600X/3800X.
>>
>> Note that egress policing in this platform is not yet
>> available in the software (but the hardware is built to
>> support it). This should be out towards the end of 2011.
>>
>> Cheers,
>>
>> Mark.
>>
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