Let's me just start by saying QOS is new to me. I've never had to deal with it before. I've been slowly upgrading the company's network, making a lot of changes. My predecessors had made some forays into CoS to prioritize voice traffic on the old switches, and I need to get it straigtened out as we seem to be encountering some quality issues.
The company has two different voice products that it uses. VLAN 6, labeled SIP, utilizes SIP based hosted stations. The host they connect to is outside the network. VLAN 8, labeled VOIP, is internal to the company, connecting to an Avaya PBX with VIOP capabilities. Each VLAN has a different private subnet, and both route through a 3750G stack set up to be the core. I have ASAs at the edge. In addition to the corporate office, we have a secondary site interconnected by a pair of fiber runs (etherchannel, different routes for redundancy). These two sites are on a flat network. That is to say, they both share the same vlans, subnets, etc. Traffic is not routed between them. We also have a half-dozen remote sites, also connected via fiber links, but those have their own subnets/vlans and are routed through a single subnet with OSPF.
To further complicate things, most of the access switches in use are HP ProCurve switches. One or two of them have qos priority settings on the VLAN interfaces. I'm also told that the SIP phones are set to transmit with DSCP values (I'm currently trying to find out from the SIP team what value that is).
I've been doing a lot of reading, and I will admit a lot of it goes over my head. I'm looking for help to get the network properly prioritizing the voice traffic througout. I've attached a logical network diagram - please note that it does not show the HP ProCurve access switches. Most of the HP switches at the HQ are hanging off a single 5308 connected to the 3750 core switch stack. At the secondary location, most of them are on the 3750 stack directly.
I look forward to your input.
