VOIP QoS policies for both Comware and Procurve

[MB99]

I have 3 switches and a bunch of SIP Phones, configured as:

          +-------+  +-------+  +-----+

Internet--|E2910al|--|A5830AF|--|E2650|--[SIP-Phones]

          +-------+  +-------+  +-----+

There is an externally hosted PBX service, and the SIP phones connect to it via the internet.

All SIP phones connect to the ProCurve E2650 (PoE) on a dedicated VLAN.

VOIP traffic (SIP & RTP) simply passes through the other two switches on that VLAN via LACP trunks.

As we are implementing more phones, it's becoming obvious that we need to implement a QoS policy to prioritise VOIP traffic.

How do I configure the E2650 to establish a QoS policy, and configure the A5830 and E2910 to trust & use that QoS policy ??

[Ian Vaughan]

Hi,

The question I always ask is - do you really need to carve out your own QoS policies or can you just get away with trusting The markings that are already there?

Most of the time setting up the appropriate vlan with the "voice" keyword under Provision OS does the trick.

On the comware OS - you'll be setting up auto-voice-vlan with "qos trust dscp"  on the interfaces and a bit of wrr (weighted round robin) with sp (special processing = priority queue) and a bit of bandwidth gurantee on queue 5. 

The phones should be marking up their own voice packets so you shouldn't really need to go looking for interesting traffic to remark unless you need to do something a bit funky

Aside from the configuration guides for the specific platforms and the 3 way Interop guide on the HP Press site, there's a couple of good blogs with fairly detailed write-ups  - have a google for "snackarelli" and / or "wantegrity"

Hope that helps

Ian

[spgsitsupport]

Could I please ask why queue 5?

If (like most) IP phone has DSCP value of 46 = CF then it would have 802.1p tag 7 (101110) which would place it in CF queue = Q6

[device1] display qos queue int ten 1/0/49
Interface: Ten-GigabitEthernet1/0/49
 Output queue: Weighted Round Robin queuing
 Queue ID        Group           Byte-count
 -----------------------------------------
 be              1               1
 af1             1               2
 af2             1               3
 af3             1               4
 af4             1               5
 ef              1               9
 cs6             1               13
 cs7             1               15

Or am I missing soimething obvious?

Seb

[spgsitsupport]

Would that be because:

Isn't DSCP 46 = EF = legacy IP precedence 5 - comware queue 5?