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15 messages in net.nether.puck.cisco-nsp[c-nsp] 3550 QoS not working as expected| From | Sent On | Attachments |
|---|---|---|
| Tim Devries | Jan 6, 2005 12:14 pm | |
| Nick Shah | Jan 6, 2005 5:39 pm | |
| Tim Devries | Jan 6, 2005 6:21 pm | |
| Nick Shah | Jan 6, 2005 6:58 pm | |
| Tim Devries | Jan 6, 2005 7:27 pm | |
| Nick Shah | Jan 6, 2005 7:51 pm | |
| Tim Devries | Jan 6, 2005 8:24 pm | |
| Sam Stickland | Jan 6, 2005 8:49 pm | |
| Tim Devries | Jan 6, 2005 9:28 pm | |
| McCallum, Robert | Jan 7, 2005 3:49 am | |
| Dmitry Valdov | Jan 7, 2005 4:03 am | |
| McCallum, Robert | Jan 7, 2005 4:05 am | |
| WILDE, David | Jan 7, 2005 4:25 am | |
| Nick Shah | Jan 9, 2005 4:10 am | |
| Tim Devries | Jan 10, 2005 11:02 am |
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| Subject: | [c-nsp] 3550 QoS not working as expected | Actions... |
|---|---|---|
| From: | Tim Devries (tdev...@northrock.bm) | |
| Date: | Jan 6, 2005 6:21:07 pm | |
| List: | net.nether.puck.cisco-nsp | |
Well, this is my current config:
Mls qos ! class-map match-all customerA match access-group 102 ! ! policy-map customerA class customerA police 3000000 8000 exceed-action drop ! ! ! interface FastEthernet0/1 description CustomerA - 3MB/s switchport access vlan 4 switchport mode access switchport protected bandwidth 3000 mls qos monitor packets service-policy history service-policy input customerA no cdp enable spanning-tree portfast ! access-list 102 permit ip x.x.x.x 0.0.0.15 any
I made some changes through the day like applying it ingress w/ access-list etc., however, it still spikes up to 5-6Mb. In all of the documentation I've read, I didn't see anything regarding the aggregate as being a necessary configuration step. I guess I'm wondering if it should work without an aggregate policer, because at least with this IOS version and my current configuration it doesn't.
When I do a
Colo-3550#sh mls qos int fa0/1 stat FastEthernet0/1 Ingress dscp: incoming no_change classified policed dropped (in pkts) Others: 38469779 38379716 90063 0 190138 Egress dscp: incoming no_change classified policed dropped (in pkts) Others: 33285081 n/a n/a 0 0
Colo-3550#
I see packets being dropped, but in my monitoring software I still see it spiking up to 5-6Mb.
Thanks,
Tim
-----Original Message----- From: Nick Shah To: Tim Devries; cisc...@puck.nether.net Sent: 1/6/05 6:39 PM Subject: RE: [c-nsp] 3550 QoS not working as expected
Tim
There are a couple of things wrong with the config. Here's what 3550 can & cant do in terms of QOS:
- Only ingress & egress policing is supported, SHAPING is NOT supported - It supports 2 types of policers Aggregate & individual - An aggregate policer acts, in a combined manner, on all classes within the policy map, essentially policing it to the rate prescribed in the aggregate policer - Individual policer polices each class to the rate - 1 x match statement per class map is supported - Ingress matching can only be done on match access-group, match ip dscp & match ip precedence - Egress matching can only be done on match ip dscp
In your case you can only match on ip dscp (on egress), and you can use an individual policer. If you want the inbound rate to also be 3MB than you may need to match on access list, dscp & precedence and then use an aggregate policer.
Check : http://www.cisco.com/warp/public/473/153.html
That url explains what you can & cant do & how to do it.
Rgds
Nick
-----Original Message----- From: cisc...@puck.nether.net [mailto:cisc...@puck.nether.net] On Behalf Of Tim Devries Sent: Friday, 7 January 2005 4:14 AM To: cisc...@puck.nether.net Subject: [c-nsp] 3550 QoS not working as expected
Hello,
We are currently attempting to do QoS with our 3550 for customers in our collocation. However, when monitoring the real-time usage of the interface using our monitoring software, it does not appear to work. For example we have a customer limited to 3Mb, but they frequently jump as high as 6Mb.
We are running Version 12.1(22)EA1a. Relevant portions of the config follow:
! Mls qos ! class-map match-all customerA match any match input-interface FastEthernet0/1 match access-group 101 match access-group 102 ! policy-map customerA class customerA bandwidth 3000 police 3000000 8000 exceed-action drop ! interface FastEthernet0/1 description CustomerA - 3MB/s switchport access vlan 4 switchport mode access switchport protected mls qos monitor packets flowcontrol send off service-policy history service-policy output customerA no cdp enable spanning-tree portfast ! access-list 101 permit ip host X.X.X.X any access-list 101 permit ip host X.X.X.X any access-list 102 permit ip any host X.X.X.X access-list 102 permit ip any host X.X.X.X
As an aside, Cisco literature mentions 3550's can do rate-limiting, but I have been unable to find any literature on how, as the usual commands don't seem to work. Is there a better way to do what I am trying to do?
Thanks for any help,
Tim
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