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QoS for VoIP on 2524 switches

Dylan Roehrig
Occasional Contributor

QoS for VoIP on 2524 switches

In looking at how to implement QoS on the 2524s, I'm not finding anything about how to enable it on anything other than the interface level. How will this work if a computer is connected to a phone then the phone into the switch? Data from both the phone and the computer will have the same priority, correct? I would like to have the phone and computer on different VLANs on the same port. Is this possible on the 2524 switches?

Thanks,
Dylan
4 REPLIES
knite
Occasional Advisor

Re: QoS for VoIP on 2524 switches

yes its possible, configure the ports as untagged for the Data VLAN and tagged for the voice vlan
Dylan Roehrig
Occasional Contributor

Re: QoS for VoIP on 2524 switches

Right, sorry I should have been more clear in my question. I would like for the phone and computer to be on the same port in different VLANs, AND I would like to enable QoS for the phone traffic. However, it appears that QoS can only be enabled by port, which I think would mean that QoS would be set for all traffic (the phone and the computer). Is that possible?
RobB_8
Advisor

Re: QoS for VoIP on 2524 switches

Dylan
I am running voip with a mix of HP switches(mostly 4100,5300 cores in big sites with 2600 for edge, and 2600 for core in small sites with 2600/2524 for edge). In some cases I have had to put a phone or 2 on a 2524. I have favored the 2600 switches as edge switches for voip when possible. They can set QOS for a specific IP and vlan. They can also handle dhcp relay and routing quite well in a small to mid sized site.
Your phones should be setting the priority bit from the DHCP and the 2524 will keep the priority and pass it along (as long as all your uplinks are tagged and not untagged), but if you get caught in a broadcast storm or high utilization, you will not have a separate queue for your voip to go into and you will start to hear echo etc.
If you need to put the phones on 2524's I would limit them where possible, enable IGMP on all the vlans to protect against broadcast storms and imaging, and have a decent core switch to plug the voip controller into that can take IP and vlan QOS rules.
Xavi.e.r
Frequent Advisor

Re: QoS for VoIP on 2524 switches

Rob,
I have a similar scenario. I have a 2610-24PWR with 2 VLANs (100-data & 104-voice). PCs are connected to IP phone and IP phone to 2610.
I am trying to enable QoS for the voice traffic (SIP protocol). See below my configuration. Does it seem OK?

ProCurve-2610-24-PWR# sh run

Running configuration:

; J9087A Configuration Editor; Created on release #R.11.30

hostname "ProCurve-2610-24-PWR"
qos dscp-map 100110 priority 7
no qos dscp-map 101110
trunk 25-26 Trk1 Trunk
snmp-server community "public" Operator
vlan 1
name "DEFAULT_VLAN"
ip address dhcp-bootp
no untagged 1-24,27-28,Trk1
exit
vlan 100
name "data"
untagged 1-24,27-28
ip address 192.111.31.245 255.255.255.0
tagged Trk1
exit
vlan 104
name "voice"
tagged 1-8,Trk1
exit
qos udp-port 5060 dscp 100110
qos udp-port 5080 dscp 100110
qos type-of-service diff-services
qos type-of-service diff-services 100110 dscp 100110
spanning-tree
spanning-tree Trk1 priority 4
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