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<[email protected]> 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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