[c-nsp] 3750 with IP-BASE, QoS

[Mack McBride]

Errr not to be contrary but you use input policing to mark(classify) CoS on conform and exceed.
I don't think the OP wants to use drop though.

Mack

-----Original Message-----
From: John Gill [mailto:johgill at cisco.com] 
Sent: Thursday, December 08, 2011 2:20 PM
To: Mack McBride
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 3750 with IP-BASE, QoS

Well, you wouldn't want to police unless there was congestion.  The 3750 can use shared SRR queues as well as priority queuing to guarantee strict priority.

You will need to familiarize yourself with the QoS operations in the
plagform:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml

You can use the access lists to classify this traffic into different DSCP or COS values, and then map those values to the desired queue and threshold.

 From there, you can then configure your srr queuing to guarantee a % of the time to a given queue.  Note you cannot set a bandwidth in Mb/s, but rather a ratio of weights will be used.

For example:
srr-queue bandwidth share 10 20 30 40
priority-queue out

This means if there is traffic in the priority queue, it is serivced. 
While there is no traffic in the priority queue, you will see queue 1 get 10/100 or 10% of the interface time to transmit, guaranteed (again, assuming no priority traffic).  If that is a 1Gb/s interface, that's 100Mb.  If it was a 100Mb/s interface, you would be guaranteeing 10Mb/s. 
  You can adjust the shared values accordingly to get acceptable numbers, the range is 1-255 last time I checked.

Regards,
John Gill
cisco


On 12/8/11 2:24 PM, Mack McBride wrote:
> On the 3750 you would use a police statement with rate, burst, exceeds and violates.
> The rate would be your various bandwidths.
> The burst would be calculated from the rate.
> It sounds like you only want to push these into queues, so you mark 
> your CoS on input using the police statements.  Then the queue sizes would be set on the various ports.
>
> LR Mack McBride
> Network Architect
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joe Freeman
> Sent: Thursday, December 08, 2011 12:02 PM
> To: Cisco-nsp
> Subject: [c-nsp] 3750 with IP-BASE, QoS
>
> I've inherited a site that's a mix of a 3750 stack and Force 10 gear.
> the 3750 stack is where the layer 3 is happening between vlans in that site. I have a need to implement QoS for some voice traffic.
>
> Since the 3750 doesn't do QoS the way the routers do, I'm sort of at a standstill..
>
> ip access-list extended AgentVoice1
> permit tcp 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 eq 80 permit tcp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 eq 443 permit tcp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 eq 8081 permit tcp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 eq 8843 permit tcp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 eq 8880 permit tcp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 range 2200 2300 permit udp 
> 10.52.200.0 0.0.1.255 XX.XX.XX.0 0.0.0.255 range 1024 65535 permit udp 
> XX.XX.XX.0 0.0.0.255 10.52.200.0 0.0.1.255 range 5060 5063 permit udp 
> XX.XX.XX.0 0.0.0.255 10.52.200.0 0.0.1.255 range 8000 8007
>
> ip access-list ext AgentAppsList
> permit ip 10.52.200.0 0.0.1.255 host 10.4.77.48 permit ip 10.52.200.0 
> 0.0.1.255 XX.XX.XX.230 0.0.0.1 permit ip host 10.4.77.48 10.52.200.0 
> 0.0.1.255 permit ip XX.XX.XX.230 0.0.0.1 10.52.200.0 0.0.1.255
>
> ip access-list ext AgentVoice2
> permit ip 10.52.133.0 0.0.1.255 10.100.5.0 0.0.0.255 permit ip 
> 10.52.133.0 0.0.1.255 10.59.5.0 0.0.0.255 permit ip 10.100.5.0 
> 0.0.0.255 10.52.133.0 0.0.1.255 permit ip 10.59.5.0 0.0.0.255 
> 10.52.133.0 0.0.1.255
>
> class-map match-all Voice1
> descr All voice traffic for agent group 1 match access-group name 
> AgentVoice1
>
> class-map match-all AgentApps
> descr Agent application traffic to/from Agent Applications match 
> access-group name AgentAppsList
>
> class-map match-all Agent_Voice_other
> descr Agent group2 voice traffic
> match access-group name Agent_Voice2
>
> policy-map Basic_QoS
> class Voice1
> ! should be set to guarantee 32Mbps, low latency, priority queuing 
> class AgentApps ! should be set to guarantee 8M, normal queuing 
> (mostly http and rdp traffic) class Agent_Voice_other ! should be set 
> to guarantee 12M, low latency, priority queuing class class-default ! 
> gets whatever is leftover/available
>
>
> So, the question is... how do I map that into a qos config that works
> (well) on the 3750?
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