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Community Member

VG248 Quality Issues

I have a VG248 connected to a 3550 switch using the auto qos features. I have have other IP phones connected to this switch and the voice quality of the IP phones is fine, but the analog devices connected to the the VG248 I am seeing packet loss.

Any suggestions?


Re: VG248 Quality Issues

Can you send the config from the 3550 and what port the VG248 is connected to?

What are the values for:

"Set DSCP QoS Value" function in VG248

Media traffic <46>

Control traffic <26>

Remember that the VG248 does not mark any L2 CoS.

Community Member

Re: VG248 Quality Issues

I have the control set to 24...

The VG248s are connected to F0/1 and F0/2


Re: VG248 Quality Issues

Please set the VG248 port to trust DSCP.

And try config below It works fine in my 3550 for my lab VG248.

interface FastEthernet0/1

description VG248

no ip address

switchport access vlan 20 <- Your VLAN

switchport mode access

mls qos trust dscp

auto qos voip trust

wrr-queue bandwidth 20 1 80 1

wrr-queue min-reserve 1 5

wrr-queue min-reserve 2 6

wrr-queue min-reserve 3 7

wrr-queue min-reserve 4 8

wrr-queue cos-map 1 0 1 2 4

wrr-queue cos-map 3 3 6 7

wrr-queue cos-map 4 5

priority-queue out

spanning-tree portfast

The VG248 doesnt support aux vlans or trunking of any kind. The VG248 knows nothing about 802.1q/p.


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