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QOS operation on 2800/2650 switches

roger_108
Occasional Contributor

QOS operation on 2800/2650 switches

Does anyone know of any way of verifying operation of QOS configuration ie monitoring queuing levels on the egress ports of these switches? I have a VoIP/Data network with a typical vlan config of
vlan 140
name "Data"
untagged 1-48
ip address 10.1.40.251 255.255.255.0
tagged Trk2
exit
vlan 145
name "Voice"
untagged 23
ip address 10.1.45.251 255.255.255.0
qos priority 5
tagged 1-48,Trk2
exit

All voice ingress traffic is tagged from the phones [it is also has dscp set in the IP header]. We are getting some unexplained VoIP degredation which should not be LAN dependent but I would like to be absolutely sure. The port stats are showing no errors but the qos diagnostics seem non-existant. I would like to be able to stress test an egress port to the level where I can see data rates and/or discard of the non priority traffic to convince myself.
2 REPLIES
Matt Hobbs
Honored Contributor

Re: QOS operation on 2800/2650 switches

There is no way to view the queues on these switches. The only way I've been able to test QoS in the past is with a video stream and a traffic generator (TFGen) to simulate a saturated link.

You can also do a packet capture to view the 802.1p / DSCP values, but that's about it.

In my experience QoS works well on ProCurve switches.

That's not much help to you, hopefully you'll find the cause soon.
cenk sasmaztin
Honored Contributor

Re: QOS operation on 2800/2650 switches

hi Roger
you want create QoS network and in all network see this operation

for you necessary wireshark program this program free and with true config you see all network packet

firs you make config one port on switch monitor port and wireshark install one pc
and this pc connect monitor port on switch and run wireshark
and see all network flow packet movement
and all QoS packet.
example:----------------------------------------------------------

Frame 53 (70 bytes on wire, 70 bytes captured)
Ethernet II, Src: 00:40:05:40:ef:24, Dst: 00:60:08:9f:b1:f3
802.1q Virtual LAN
000. .... .... .... = Priority: 6
...0 .... .... .... = CFI: 0
.... 0000 0010 0000 = ID: 32
Type: IP (0x0800)
Internet Protocol, Src Addr: 131.151.32.129 (131.151.32.129), Dst Addr: 131.151.32.21 (131.151.32.21)
Transmission Control Protocol, Src Port: 1173 (1173), Dst Port: 6000 (6000), Seq: 0, Ack: 128, Len: 0
-------------------------------------------------------------------

two method QoS config on your network L2 and L3 prioritization standart

1. IEEE 802.1p, a Layer 2 technology that uses a three-bit field in the 802.1Q
VLAN tag to indicate prioritization

2. IP Type of Service (ToS) and DiffServ, which are Layer 3 technologies that
use the IP ToS field to indicate prioritization. Because they function at Layer3, these technologies can be used to enforce prioritization across WAN
interfaces.

I hope you want L2 prioritization on lan
please you see carefully below my opinion

for L2 priority :
you make frist assign vlan or interface on your switch and assing 0-7 priority


and you make end device assign same priority ip phone and voip server

this priority switches see only tagging port.

for more info wireshark:http://wiki.wireshark.org/VLAN

good luck.
cenk