Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

4510 QOS issue

I am a seeing QOS issue with our 4510 switches.  When performing a file copy using a Windows client from our NetApp SAN, I am seeing the output drop counter increment when the auto qos policy is applied to the client interface.  The copy will start out, then pause for 20 to 30 seconds at a time, and then continue along.  When the pauses happens, the drop counter is incrementing.  

 

GigabitEthernet1/25 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet Port, address is 6400.f161.2a38 (bia 6400.f161.2a38)
  Description: 5W-097  A
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is off, output flow-control is off
  Auto-MDIX on (operational: on)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:37, output never, output hang never
  Last clearing of "show interface" counters 2d20h
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 34633

I am seeing the traffic drop under the counter Dbl-Drops-Queue-8

Auto QOS policy on 4510
Building configuration...

Current configuration : 733 bytes
!
policy-map AutoQos-VoIP-Input-Cos-Policy
 class AutoQos-VoIP-Bearer-Cos
   set qos-group 46
 class AutoQos-VoIP-Control-Cos
   set qos-group 24
policy-map AutoQos-VoIP-Input-Dscp-Policy
 class AutoQos-VoIP-Bearer-Dscp
   set qos-group 46
 class AutoQos-VoIP-Control-Dscp26
   set qos-group 26
 class AutoQos-VoIP-Control-Dscp24
   set qos-group 24
policy-map AutoQos-VoIP-Output-Policy
 class AutoQos-VoIP-Bearer-QosGroup
   set dscp ef
   set cos 5
    priority
    police cir percent 33
 class AutoQos-VoIP-Control-QosGroup26
   set dscp af31
   set cos 3
    bandwidth remaining percent 5
 class AutoQos-VoIP-Control-QosGroup24
   set dscp cs3
   set cos 3
    bandwidth remaining percent 5
 class class-default
    dbl
!
end

 

Does anyone know why this would be happening?

 

Everyone's tags (1)
4 REPLIES

Hey,Can you try enabling flow

Hey,

Can you try enabling flow control in ingress direction and let us know the result.

Regards,

RS.

New Member

I enabled flow-control and it

I enabled flow-control and it made no difference.

Green

Hi,Can you share your

Hi,

Can you share your interface config too

Regards

Alex

Regards, Alex. Please rate useful posts.
New Member

interface GigabitEthernet1/25

interface GigabitEthernet1/25
 description 5W-097  A
 switchport access vlan 143
 switchport mode access
 switchport voice vlan 355
 load-interval 30
 auto qos voip trust
 qos trust device cisco-phone
 service-policy input AutoQos-VoIP-Input-Cos-Policy
 service-policy output AutoQos-VoIP-Output-Policy
end

 

NY-4510-5W-1#sh policy-map
  Policy Map AutoQos-VoIP-Input-Cos-Policy
    Class AutoQos-VoIP-Bearer-Cos
      set qos-group 46
    Class AutoQos-VoIP-Control-Cos
      set qos-group 24

  Policy Map AutoQos-VoIP-Input-Dscp-Policy
    Class AutoQos-VoIP-Bearer-Dscp
      set qos-group 46
    Class AutoQos-VoIP-Control-Dscp26
      set qos-group 26
    Class AutoQos-VoIP-Control-Dscp24
      set qos-group 24

  Policy Map AutoQos-VoIP-Output-Policy
    Class AutoQos-VoIP-Bearer-QosGroup
      set dscp ef
      set cos 5
      priority
     police cir percent 33
       conform-action transmit
       exceed-action drop
    Class AutoQos-VoIP-Control-QosGroup26
      set dscp af31
      set cos 3
      bandwidth remaining percent 5
    Class AutoQos-VoIP-Control-QosGroup24
      set dscp cs3
      set cos 3
      bandwidth remaining percent 5
    Class class-default

 

 Service-policy output: AutoQos-VoIP-Output-Policy

    queue stats for all priority classes:
      Queueing
      queue limit 400 packets
      (queue depth/total drops)  0/0
      (bytes output) 107845

    Class-map: AutoQos-VoIP-Bearer-QosGroup (match-all)
      0 packets
      Match: qos-group 46
      QoS Set
        dscp ef
        cos 5
      Priority: Strict, b/w exceed drops: 0
      
      police:
          cir 33 %
          cir 330000000 bps, bc 10312500 bytes
        conformed 0 bytes; actions:
          transmit
        exceeded 0 bytes; actions:
          drop
        conformed 0000 bps, exceed 0000 bps

    Class-map: AutoQos-VoIP-Control-QosGroup26 (match-all)
      0 packets
      Match: qos-group 26
      Queueing
      queue limit 264 packets
      (queue depth/total drops)  0/0
      (bytes output) 0
      QoS Set
        dscp af31
        cos 3
      bandwidth remaining 5%

    Class-map: AutoQos-VoIP-Control-QosGroup24 (match-all)
      3516 packets
      Match: qos-group 24
      Queueing
      queue limit 264 packets
      (queue depth/total drops)  0/0
      (bytes output) 640
      QoS Set
        dscp cs3
        cos 3
      bandwidth remaining 5%

    Class-map: class-default (match-any)
      102355016 packets
      Match: any
        102355016 packets
      
      queue limit 1160 packets
      (queue depth/total drops)  0/0
      (bytes output) 23653743876
      dbl
          Probabilistic Drops: 6 Packets
          Belligerent Flow Drops: 458 Packets

 

This is what I am seeing.  When I perform a copy from the NetApp to my Windows client, the Belligerent Flow Drop counter increments, which causes pauses and slowness during the copy.  However, if I perform the copy using a Mac, the Belligerent Flow Drops do not increment and copy speed is great.  About 800Mb/s.

 

 

356
Views
0
Helpful
4
Replies
CreatePlease login to create content