Question

URGENT - QOS and HP 1800-24G

Asked by: leegclystvale

Hi,

I have no experience with switches or QOS and have had a lot of HP1800-24G switches deployed across the network. The switch guys say that the switch doesn't support QOS as the manual doesn't mention it, but I can see from the HP1800 FAQS that it states:

Q: How does the ProCurve Switch 1800 series service 802.1p priorities?
A: There is no software configuration of 802.1p for the ProCurve Switch 1800 series. The ProCurve Switch 1800 series honors priorities of the frames received.

Q: How many queues are supported by the ProCurve Switch 1800 series?
A: The ProCurve Switch 1800 series supports 4 queues per port.

Q: How are the 802.1p priorities mapped to the queues for the ProCurve Switch 1800 series?
A: The ProCurve Switch 1800 series 802.1p priorities are mapped as shown in the following table.

Port Queue and 802.1p Priority Values  |           Priority for Exiting From the Port
______________________________________________________________
Low (1 - 2)                                              |           First
Normal (0, 3)                                           |          Second
Medium (4 - 5)                                         |          Thrid
High (6 - 7)                                              |             Fourth


So what does this mean?
The switch will identify voice traffic and allocate it to the highest priority automatically?
How does this work when a VOIP handset is used as a hub with a PC on the end of it?

Really stressed and could do with a good explanation as need to see how voice will be dealt with before it all falls around me!!!

Thanks for any help

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Asked On
2009-10-27 at 00:18:01ID24846333
Tags

HP1800

,

QOS

,

802.1p

,

traffic prioritisation

Topics

Networking Protocols

,

Network Switches & Hubs

Participating Experts
2
Points
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Comments
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Answers

 

by: ikalmarPosted on 2009-10-27 at 01:29:28ID: 25670092

HI,

It means the the switches supported basic QOS but you not able to finetuning, it has for queue!
The queues matching the COS: Marked packets with 802.1p Class of Service Marking.

Please refer for more details here:
http://en.wikipedia.org/wiki/Differentiated_services

Best regards,
Istvan

 

by: leegclystvalePosted on 2009-10-27 at 07:55:47ID: 25673080

Ok thanks. So what marks the packets? Is it the phone? The switch? Can the handset mark packets or does it need to hit the switch first?

Sorry for being so dumb at this but I've never looked at this side of things and I'm very pushed......

 

by: atrevidoPosted on 2009-10-27 at 08:03:55ID: 25673189

There is a network standard called 802.1p and 802.1q.  It defines QOS and VLAN IDs at Layer 2.

http://en.wikipedia.org/wiki/IEEE_802.1p

The phone and the VoIP controller would mark the packets.  Traversing layer 3, the router would also carry that tag.  So basically, those switches you have will pass tagged packets but will not tag them.  Let me look at the manual for the 1800 and get back to you in a minute.  Are you VLANing your VoIP?  What VLAN is your phones in?  

 

by: ikalmarPosted on 2009-10-27 at 08:05:45ID: 25673207

The phones marks the packet, and the switch handling the QOS of COS

 

by: leegclystvalePosted on 2009-10-27 at 08:08:12ID: 25673231

Thanks atrevido. Yes phones are VLANed in a 10.3.9/24 subnet.

The Core Cisco 3750s have been enabled for QOS etc but it's the edge switches (HP 1800-24G) that I need to find out about. There are a number of users that will be using the handsets as a switch to their PC's.

Hope that helps. ps the manual doesn't even mention QOS or .1p

I had to look on the HP FAQs for the 1800

many thanks

 

by: leegclystvalePosted on 2009-10-27 at 08:09:19ID: 25673246

Thanks ikalmar for your help

 

by: atrevidoPosted on 2009-10-27 at 08:49:59ID: 25673797

So what you need to do on your switches is configure the VLANs.  The switch has to be told to expect the VLAN.   You didn't tell me the VLAN ID, you just gave me the IP address.  The 1800 is web managed, see http://cdn.procurve.com/training/Manuals/1800-MgmtCfg-June2007-59916275.pdf starting at page 2-25.  Obvioulsy, login in via the URL to the switch, go to the VLAN page, and set up the VLAN.   Let's say your VLAN is 9.  So, create a VLAN 9, and the way VOiP works with PCs behind the phones is that each port in the switch EXCEPT the uplink port to the router or next switch will be as follows

VLAN 9 Tag ports 1-24  (or whatever)

VLAN 1 untag ports 1-24 (or whatever the port count is)

for the uplink port, tag all vlans, so tag vlan 1 and vlan 9.

PCs NICs are traditionly not VLAN aware, so they can only understand untagged packets.  VoIP phones are VLAN aware, so they can understand tagged packets.

On page 2-29, the PVID will be 1

Hope that helps

 

by: leegclystvalePosted on 2009-10-27 at 11:57:27ID: 31646320

Thanks for your help. I should have got better QOS switches!!!

20120131-EE-VQP-002

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