QoS LAN

Answered Question
Apr 15th, 2008
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Hi there !


I'm trying to configure LAN QoS in a 3560G, but it seems that the config is now working.. (probably I'm doing something wrong...)


I tryied to make it as clean as possible


--- CONFIG ---

mls qos

mls qos map cos-dscp 0 8 16 26 34 46 48 56

class-map match-all CIPC

match access-group name CIPC

policy-map CIPC

class CIPC

set dscp ef

interface GigabitEthernet0/1

service-policy input CIPC

ip access-list extended CIPC

permit udp any any range 16384 32767

permit tcp any any range 2000 2002

permit icmp any any


--- show policy-map ---


#show policy-map interface gi 0/1

GigabitEthernet0/1

Service-policy input: CIPC

Class-map: CIPC (match-all)

0 packets, 0 bytes

offered rate 0 bps, drop rate 0 bps

Match: access-group name CIPC

Class-map: class-default (match-any)

0 packets, 0 bytes

offered rate 0 bps, drop rate 0 bps

Match: any

0 packets, 0 bytes

rate 0 bps


---


As you can see there are 0 packages in Class-map CIPC..


I'm trying to set all voice traffic and call signalling as EF.


Can you help me ?

Andrei.





Correct Answer by andrew.butterworth about 9 years 3 months ago

The counters don't work. This is a know and well documented limitation with the majority of Catalyst IOS switches. You need at least a Catalyst 4500 SupIV with NetFlow hardware for the counters to work. There are some other statistics available though:


show mls qos interface X/X statistics

show platform port-asic stats enqueue FastEthernet X/X

show platform port-asic stats drop FastEthernet X/X



The statistics on the older Catalyst 3550 were much better in my opinion as these would show you packet counts for classified, policed and dropped packets per interface. The 3560/3750 (& 2960) only have counters for 'in profile' & 'out of profile' when a policer is attached, however these don't distinguish between marked down or dropped, nor do they tell you what DSCP value they were.


Andy

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Correct Answer
andrew.butterworth Tue, 04/15/2008 - 08:05
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The counters don't work. This is a know and well documented limitation with the majority of Catalyst IOS switches. You need at least a Catalyst 4500 SupIV with NetFlow hardware for the counters to work. There are some other statistics available though:


show mls qos interface X/X statistics

show platform port-asic stats enqueue FastEthernet X/X

show platform port-asic stats drop FastEthernet X/X



The statistics on the older Catalyst 3550 were much better in my opinion as these would show you packet counts for classified, policed and dropped packets per interface. The 3560/3750 (& 2960) only have counters for 'in profile' & 'out of profile' when a policer is attached, however these don't distinguish between marked down or dropped, nor do they tell you what DSCP value they were.


Andy

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