QoS Monitoring on Cat 3550

[zengxing]

I would like to use NMS to poll the MIBs via SNMP to collect the statistics of the QoS performance on the switch Cat 3550. Some of the items I am interested to monitor are:

1. Packets dropped due to non-conformance;

2. Bandwidth of each class of traffic (e.g. VoIP ? EF, DSCP 46) at the juncture of being polled;

3. Tail drop / WRED occurred for which particular queue in the cat3550 egress interface.

Is this information available on Cat 3550

when QoS feature is enabled? Any software recommended to do the monitoring?

[David Stanford]

Have a look at the CISCO-PORT-QOS-MIB

There are numerous objects in this MIB to monitor aspects of QoS

ftp://ftp-sj.cisco.com/pub/mibs/supportlists/cat3550/cat3550-supportlist.html

[sbhadrav@cisco.com]

QoS Monitoring on Cat 3550

Case Solution:
when you say "limit bandwidth utilization" you will need a policer or shaper. The command "bandwidth 64" does not do it.

You would need

policy-map test

class MaxRate

police 64000

as a minimum configuration. Have a look at

"Understanding QoS Policing and Marking on the Catalyst 3550"

http://www.cisco.com/en/US/products/hw/switches/ps646/products_tech_note09186a00800feff5.shtml