The company I currently work for has Centurylink L2 Metro E at all of our locations. Our setup is quite a few years old and we are looking at upgrading capacity which will force us to their latest hardware platform. It is sounding like they no longer offer the same QOS secondary VLAN that we currently utilize in their new infrastructure. Currently they have a 100mbps line going into their on site switch and one of the ports on the switch is a dedicated voice VLAN that is limited to between 10-15mbps (depending on what we are paying for) which leaves the other 85-90 for data on another port, 3 total ports in use.
With this voice network, which their marketing dept calls "Ethernet Quality of Svc Gold" we have had absolutely 0 voice issues over the last 6 years I have been here and it has moderately heavy use, 80+ calls at peak. If we upgrade our connections and are unable to utilize this service any more, I am assuming we could achieve mostly the same quality with our own configurations. (and save $1k/mo in QOS Gold fees)
We run our voice network completely separate with dedicated voice VLANs at each site that are all routed separate from data across the Metro E network. Our routers at each location are a mix of older Cisco tech, namely 3845 routers, 3750 and 6500 L3 switches depending on the location.
My thoughs on setup:
- Combine the voice and data on to a single gigabit port from CL to these routers/switches
- Use separate Voice/Data VLANs on the WAN/LAN (4 total)
- VRF for splitting the routing
Since the 3750 switches don't support subinterfaces on L3 ports, will throttling on the WAN VLAN interfaces work?
Should I be able to duplicate the current QOS by limiting the data VLAN to the speed of the pipe minus the speed we want to dedicated to voice? Would the routers/L3 switches we have be able to accomplish this?
How would you approach this requirement?
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