3560 interface config with a Cisco IP Phone

[Brendan Marmont]

Hi,

We are using Cisco 3560 switches with Cisco 79xx and 69xx series phones connected to them.

Whats the best practice for configuring an interface with a cisco phone connected to it? I'd like some consistency accross the board, are there any commands that can be ommited or should be added.

Current config

interface FastEthernet0/1

switchport access vlan 2

switchport mode access

switchport voice vlan 12

srr-queue bandwidth share 10 10 60 20

srr-queue bandwidth shape 10 0 0 0

priority-queue out

mls qos trust device cisco-phone

mls qos trust dscp

auto qos voip cisco-phone

macro description cisco-phone

spanning-tree portfast

service-policy input AutoQoS-Police-CiscoPhone

Config from another site

interface FastEthernet0/12

switchport access vlan 11

switchport mode access

switchport voice vlan 101

mls qos trust dscp

auto qos voip cisco-phone

macro description cisco-phone

spanning-tree portfast

spanning-tree bpduguard enable

[Marwan ALshawi · Accepted solution]

both can work with out any issue if the voice and data vlans are right

the only difference is the first one is better because it has the priority queue enabled and traffic shaping for queue 1 (PQ) is set to avoid over utilize other queues by voice traffic in conjunction with the inbound policing

i would say first one looks better but second one works as well

HTH

[Brendan Marmont]

Cheers for that, I will add srr-queue bandwidth share 10 10 60 20 and srr-queue bandwidth shape 10 0 0 0

What do the following commands do exactly?

priority-queue out

queue-set

[Marwan ALshawi · Accepted solution]

Hi Brendan,

the priority-queue enable the HW priority queue in the switchport ( traffic in that queeu will be serviced first )

queue-set is the inbound queuing config, you can change some of the ingress queues maping to cos/dscp for example

3560 egress priority queue has queue-id 1

HTH