I've got two cisco switches (3750 & 3560) and I'm about to install (move) an ASG 7.4 in between them. I have lots of VoIP traffic going through the switches with the QoS bit set. The Cisco switches are configured with
and I need to be sure that the QoS bit for VoIP isn't removed by the ASG 7.4.

I'm not looking to shape the traffic, just to pass it through and have the QoS also go through. The traffic ends up in a WAN router which then will prioritize the traffic between locations.

If you are putting the Astaro inline, and have enabled bridging, you should not have a problem; I have a customer that is bridging two segments like his carrying VOIP traffic on a WAN, and the QoS tags remain intact.

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Convergent Information Security Solutions, LLC
Astaro Preferred Solution Partner

I'm not bridging. Look at the 3750 as my core switches where internet, wan etc are connected on different VLANs. The FW will protect the servers on the 3560 servers, so it will sit between and switches. Some of the servers connected to vlans on 3560 will send/receive voip traffic to and from the wan connection (going to another location of ours). But I need to be sure that the QoS bit (tos) will stay intact (0xb8).

I don't have time at the moment (nor the hardware) to just do the test myself, so thats the reason I'm asking

It's at least positive that it works in bridging... anyone knows about it working in normal FW mode?

As an update to the first post - I've dropped using qos queues - no need on gigabit switch, it's the wan that's the bottleneck (and where qos will be in place). I'm just trusting the ports on the switches now (meaning cisco won't strip the QoS bit (0xb8)):