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The 3120 has 4 switch ports which can each be programmed to access an individual VLAN or it can be programmed as a 802.1q trunk port.
That trunked switch port can be programmed to have a native VLAN of your choice. Any untagged traffic leaving that switch port will be tagged with the native VLAN ID.
The Ethernet 0/1 interface can also handle VLAN tagging if you needed it to do so by configuring encapsulation with sub-interfaces.
In this case, any packets not tagged would be tagged by the interface with VLAN 1.
Interface Ethernet 0/1
Interface Ethernet 0/1.1
ip address 192.168.1.1 255.255.255.0
vlan-id 1 native
Interface Ethernet 0/1.2
ip address 192.168.2.1 255.255.255.0
I hope this helps.
I would like to add one minor correction. The NetVanta 3100 Series units do not support 802.1q trunking on the Ethernet WAN port. Please, see the following post for additional information: https://supportforums.adtran.com/message/1765#1765.
Oops! I made an assumption there. Most NetVanta products with Ethernet ports do all encapsulation. That makes sense as the CPU is puny on the 3120 model. I am looking forward to the 3140 whenever it comes out.
2) Yes but keep in mind the CPU limitations of a 3120. It's not really designed for that sort of thing even though it can be programmed to do it. You're dealing with a box rated at 10Mbps of throughput
4) With that number of VOIP endpoints and the fact that you want to use VQM, I don't think I would recommend the 3120 for that. Without more information on bandwidth, simultaneous call volumes, etc, I would err on the side of caution and recommend you go with a 3448 (with EFP for the VQM part) instead.
Adtran Applications Engineering