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тАО01-24-2006 02:54 AM
тАО01-24-2006 02:54 AM
I have 2524s at network edges and 9308s at core.
I'd like to implement some form of QoS for VoIP services.
I noticed that 2524s support only port-based 802.1p. Is it true?
Is ToS supported in some form?
What is the best way to implement VoIP with this scenario?
Thanks
Solved! Go to Solution.
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тАО01-24-2006 12:53 PM
тАО01-24-2006 12:53 PM
Re: QoS with 2524+9300
Check out the ProCurve VOIP cookbook - http://www.hp.com/rnd/pdfs/VoIP_Cookbook.pdf
With the 2524 if you're going to have PC's connected to the phones in a different VLAN, then you should be okay as long as the phones insert an 802.1p flag for the voice traffic.
Otherwise if you have phones only, then you can force the port's priority only as you have suggested.
Matt
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тАО01-24-2006 07:11 PM
тАО01-24-2006 07:11 PM
Re: QoS with 2524+9300
At the core (9304), do I need to map 802.1p (level 2) priorities to DSCP (level 3), if server and phones are on different subnets?
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тАО01-24-2006 08:11 PM
тАО01-24-2006 08:11 PM
Re: QoS with 2524+9300
When a 9300 routes from one VLAN to another, it will retain the 802.1p priority within the tag and just change the VLAN ID.
So for all your VLANs that are involved with voice, as long as you keep them tagged between all your switches, you should be okay.
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тАО01-27-2006 03:48 AM
тАО01-27-2006 03:48 AM
Re: QoS with 2524+9300
Then not 802.1Q-tagged devices will be able to reach it?
Thanks again.
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тАО01-27-2006 02:37 PM
тАО01-27-2006 02:37 PM
SolutionIt depends on what switch you'll be connecting it to. If connecting to a 2500, you'll want to set the port priority, or if the VOIP server is capable of tagging and inserting a priority tag, then that's also fine.
Alternatively if connecting to the 9300 you can configure the qos priority on the VLAN (which you'll want to do in the core anyway), and keep the port untagged. You could even prioritise based on the IP address.
Matt
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тАО01-31-2006 01:54 AM
тАО01-31-2006 01:54 AM
Re: QoS with 2524+9300
How can I check if priority is working on the full path?
Can I dump packets of interest on 2524s and 9304s and look at vlan tag?
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тАО01-31-2006 12:59 PM
тАО01-31-2006 12:59 PM
Re: QoS with 2524+9300
The only way I know to check if the priority tags are being inserted, is to perform a packet capture with ethereal.
One way is to put a hub in between two switches, and connect your ethereal machine into the hub. You can also set a mirror-port on your switch. That port will need to be a tagged member of the VLAN you are interested in. I would then monitor the uplink port. Sometimes the hub is just easier...
Next, depending on your NIC you may not be able to see the VLAN tag if using Windows. If you have an Intel or Broadcom NIC though you're in luck - http://wiki.ethereal.com/CaptureSetup/VLAN
Otherwise I've found if you run Ethereal on Linux you can always see the tag.
Matt
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тАО01-31-2006 08:55 PM
тАО01-31-2006 08:55 PM
Re: QoS with 2524+9300
You are really a guru.
Thanks again