Mohammad,
The ES ports on the ME3750 are different than the other ports. Which
kind are yo using?
For ES ports you can use average rate shaping (class-based):
http://www.cisco.com/en/US/docs/switches/metro/catalyst3750m/software/release/12.2_50_se/configuration/guide/swqos.html#wp1282429
For non-ES ports, you can use "srr-queue bandwidth limit" to shape an
entire interface to a rate, configurable at integer percentages - this
is a great command but lacks in granularity. For example, you can set
a gigabit port to 80% bandwidth, and you may see "show mls qos interface
gi1/0/1" will say the bandwidth limit is 81.75. If you set the
bandwidth to 81%, you may see the limit has not actually changed, or
perhaps it's now 82.03. Just making up some examples, but basically you
will see the actual hardware implementation of that command when you
check it. The downside is that this command affects the whole port and
is not a true CIR, so it works well for handing off to a provider that
charges you overage but not great if you are using it for a customer
that you guarantee a certain burst. When using bandwidth limit, you are
relying on the egress buffers to handle the burst, so as you allocate
more buffer for a given queue, you will see better performance in
congestion.
Regards,
John Gill
cisco
On 5/30/11 9:19 PM, Mohammad Khalil wrote:
Hi
i am facing the same issue with Cisco ME3750
and the traffic i want to limit is the outbound traffic
Date: Sun, 29 May 2011 23:34:20 +0200
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [c-nsp] Catalyst 6524 rate limit per port/vlan
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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