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Help needed with QOS on 3750 stack

Posted on 2010-01-11
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Last Modified: 2012-05-08
I need some help setting up QOS on a 3750 switch stacks with two members - both  ws-c3750-48ts.

The QOS is needed for a network DVR that was just installed and that isn't functioning as expected. The general consensus is that it's a network issue (aren't they all) and that QOS is needed. However, after looking at the interface it appears that it isn't utilizing more than 20 megs of a 100 meg link..... but anyway, here is the config I have so far, and believe me when I tell you I have no clue what I'm doing when it comes to QOS. Honesty counts for something, right???  :)


mls qos

class-map match-all DVR
 match access-group name DVR

policy-map DVR
 class DVR
  set ip precedence 5

Extended IP access list DVR
    10 permit tcp any host <DVR IP>
    20 permit tcp host <DVR IP> any

interface FastEthernet2/0/6
 description DVR
 switchport access vlan 2
 switchport mode access
 mls qos trust dscp
 spanning-tree portfast
 service-policy input DVR
end


Any ideas on what I might be doing wrong here?
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Question by:dharrell74
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6 Comments
 
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Expert Comment

by:Vito_Corleone
ID: 26289748
What exactly isn't working? Is the traffic not being marked? You will probably need to apply this to your L3 interface on the switch (VLAN 2, in this case?). Or on your upstream router/L3 switch.

Is the goal of your config just to mark, or are you actually trying to manipulate the traffic?
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Author Comment

by:dharrell74
ID: 26292542
Vito, it appears that it isn't being marked. What we are wanting to do is give any traffic to this IP a higher preference than other traffic. We don't have VOIP employed at this time, so we have no other QOS on the switch.

Here's what I get when trying to apply the service policy to the vlan:

switch(config)#int vlan 2
switch(config-if)#service-policy input DVR
Master SVI send all failed for interface Vlan2, cmd = 38

Service Policy attachment failed


And here's the output of a sh qos stats for the current interface the service-policy is applied to:

switch#sh mls qos inter fastEthernet 2/0/6 stat
FastEthernet2/0/6 (All statistics are in packets)

  dscp: incoming
-------------------------------

  0 -  4 :     7773991            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0            0
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0            0            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  dscp: outgoing
-------------------------------

  0 -  4 :     3805990            0            0            0            0
  5 -  9 :           0            0            0            0            0
 10 - 14 :           0            0            0            0            0
 15 - 19 :           0            0            0            0            0
 20 - 24 :           0            0            0            0            0
 25 - 29 :           0            0            0            0            0
 30 - 34 :           0            0            0            0            0
 35 - 39 :           0            0            0            0            0
 40 - 44 :           0            0            0            0            0
 45 - 49 :           0            0            0            0            0
 50 - 54 :           0            0            0            0            0
 55 - 59 :           0            0            0            0            0
 60 - 64 :           0            0            0            0
  cos: incoming
-------------------------------

  0 -  4 :     7773994            0            0            0            0
  5 -  7 :           0            0            0
  cos: outgoing
-------------------------------

  0 -  4 :     3923213            0            0            0            0
  5 -  7 :           0            0            0
Policer: Inprofile:            0 OutofProfile:            0
switch#
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Expert Comment

by:Vito_Corleone
ID: 26292579
Please post the output of "sh policy-map int fa2/0/6". Also, is that VLAN 2 interface the gateway for hosts in that VLAN? My concern is that you are trying to mark packets on an L2 port.
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Author Comment

by:dharrell74
ID: 26292738
Vito, here's the output you requested:

switch#sh policy-map int fa2/0/6
 FastEthernet2/0/6

  Service-policy input: DVR

    Class-map: DVR (match-all)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: access-group name DVR

    Class-map: class-default (match-any)
      0 packets, 0 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: any
        0 packets, 0 bytes
        5 minute rate 0 bps

Regarding the gateway question, no. This stack is an access-layer switch and is completely L2. The gateway for this vlan is upstream on another 3750 stack directly connected via 1gig fiber.

So, yes I am trying to mark packets on a L2 port. The reason is, all the users that will be using this DVR are on this switch stack, so I was hoping to apply the QOS settings only on this switch.

Also, I adjusted my monitoring solution to pull snmp from this interface every 1 minutes and it's still showing a max of only 200k being utilized on the interface in a 12 hour period. Do you think QOS will provide any improvement when such a small amount of traffic is being passed?
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Accepted Solution

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Vito_Corleone earned 2000 total points
ID: 26292780
No, I don't think QoS is an issue for you here. If everyone using that DVR is local to the switch, QoS isn't going to accomplish anything for you here.  I figured I'd do my best to get it working though, lol.

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Author Comment

by:dharrell74
ID: 26292912
LOL.... well thanks for the assistance, but I don't want to waste anyone's time on qos if it won't provide a solution.
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