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: [email protected]
[mailto:[email protected]] 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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_______________________________________________
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