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6.5

QoS VOIP Cisco switches 3550

Asked by jackstark in Voice Over IP, Network Switches & Hubs

Dear All,

We would appreciate some expert opinions on our little QoS and VOIP situation.

We have a wireless bridge linking the main office to a remote office some 60 metres away. At the remote office there are 10 users each with a laptop and Inter-tel VOIP phone. At either end of the wireless link is a Cisco 3550 uplinking directly into the WAP. The user laptops will use a wireless connection to an additional WAP which is then in turn connected into the 3550. Each of the phones has a dedicated Cat5 cable running to them, we wont be connecting the laptops into the back of the phones. The PBX is located at the main office, also plugged into the 3550.

The plan is to have separate voice and data VLANs and rely on the trunks connecting the 3550s into WAP bridges to provide the necessary QoS to ensure good voice quality.

QoS appears a bit of a prickly subject and even after reading all the CCNP and some of the CCIE material on it, I still have more questions than answers. Auto QoS seems an ingenious idea but all the cisco resources assume you are installing a cisco phone system, which we arent, so i dont know if we can use it or not. There is also a Voice VLAN mentioned in quite a few places but again not sure if it is applicable to non-cisco phones.

So here is a tentative configuration weve put together:

In Global:
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos min-reserve 5 170
mls qos min-reserve 6 85
mls qos min-reserve 7 51
mls qos min-reserve 8 34
mls qos

Interfaces:
interface FastEthernet0/1
Desciption VOIP PHONE1
switchport mode access
switchport access vlan 10
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out

interface FastEthernet0/24
description UPLINK TO WAP BRIDGE
switchport trunk encapsulation dot1q
switchport mode trunk
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out

Can anyone see any issues with this config, especially considering we wont be using cisco phones?

Can anyone explain what the functional difference is between entering:

auto qos voip trust
and
auto qos voip cisco-phone

One last thing, is there a way to verify that the QoS is actually functioning and be able to see packets going in and out of the priority queue?

Any help, assistance and guidance provided is very much appreciated.

Get your answer NOW

QoS VOIP Cisco switches 3550

Asked by jackstark in Voice Over IP, Network Switches & Hubs

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