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QoS on 3550 - Unexpected drops

I have applied a policy (ingress) on some of my access layer switches in order to classify and mark traffic out at the access edge.  I am also using a policier to mark down traffic in the default class; marking down to CS1 anything that exceeds 3mbps.  The policy has generally been working fine but I received a complaint from one of our security personnel who views surveillance video on his PC via a client that remotes a Video DVR system.  I tracked down the port and noticed that there were drops on the qos statistics and they were incrememting.  I removed the policy and the problem cleared up immediately.  My thinking was the policier would only mark down traffic, not drop anything.  I cleared the mls counters and put the policy back and right away the drops started happening again.  Any suggestions would be appreciated.

!
class-map match-all EDUMET-CM
match access-group name edumet
class-map match-all POWER-SCHOOL-CM
match access-group name power-school
class-map match-all VOICE-SIGNAL-CM
match access-group name voice-signal
class-map match-all VOICE-BEARER-CM
match access-group name voice-realtime
class-map match-all EX2K7-CM
match access-group name exchange-2007
class-map match-all LWAPP-CM
match access-group name lwapp
!
policy-map COLOR-PM
class VOICE-BEARER-CM
  set dscp ef
    police 128000 8000 exceed-action drop
class VOICE-SIGNAL-CM
  set dscp cs3
    police 32000 8000 exceed-action drop
class POWER-SCHOOL-CM
  set dscp af31
class EDUMET-CM
  set dscp af21
class LWAPP-CM
  set dscp af21
class EX2K7-CM
  set dscp af11
class class-default
    police 3000000 46875 exceed-action policed-dscp-transmit
!
int range f0/1-48
service-policy input COLOR-PM
!

84-IDF2-3550-1#sh mls qos interface f0/46 statistics
FastEthernet0/46
Ingress
  dscp: incoming   no_change  classified policed    dropped (in bytes)
Others: 27435275   26630923   804352     0          231872   
Egress
  dscp: incoming   no_change  classified policed    dropped (in bytes)
Others: 137755124     n/a       n/a      0          0       

84-IDF2-3550-1#sh mls qos interface f0/46 statistics
FastEthernet0/46
Ingress
  dscp: incoming   no_change  classified policed    dropped (in bytes)
Others: 27487141   26664613   822528     0          237824   
Egress
  dscp: incoming   no_change  classified policed    dropped (in bytes)
Others: 138316355     n/a       n/a      0          0       

2 REPLIES

Re: QoS on 3550 - Unexpected drops

which class would the survelience video traffic fall under ?

Cisco Employee

Re: QoS on 3550 - Unexpected drops

You have two classes " VOICE-BEARER-CM &  VOICE-SIGNAL-CM" have drop action.  You did not post your ACL or the video survialence traffic. I suspect that the video suvelaince traffci is matched by one of these classes before it hit the class-default.

Thanks

Hatim Badr

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