We have an Avaya PBX Medpro board plugged into a 3750 port with the following configuration:
interface FastEthernet1/0/4
description PBX Medpro-1
switchport access vlan 10
switchport mode access
duplex full
speed 100
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
mls qos trust dscp
auto qos voip trust
Everything was working fine until the PBX call level went above 110 calls (G-711) which pushed the interface to more than 10mbps. When this happened random calls out of that medpro became garbled and after lots of troubleshooting we came to the conclusion that the default auto qos settings where the problem.
Default auto qos puts these statements on an interface:
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
...which means that queue 1 will allow for 10mbps of traffic and then shaping will kick in.
Adding the line 'priority-queue out' to the interface disables the 10mbps limitation of queue 1 and instead forces the interface to process every packet that goes into the priority queue before anything else.
My question is - is there a 'show' command that we can use to see shaping at work? On router ports with a service policy that has shaping or policing on it you can see the shaping/policing in real time with 'show policy....'
What about on the 3750 switch ports?
