Two different ISP uplinks (P2P wireless & DSL for failover) -> RB433 (eth1 & eth2 respectively) -> Eth3 10.0.0.0/24 Office LAN -> Port 1 Netgear GS724T switch (supports 802.1Q vlans) for server room/backend (out port 24) -> port 1 Netgear GS748T (also 802.1Q capable) switch (office computers/VoIP phones)
The goal is to create a vlan on eth3 (tag vlan2) with DHCP (10.0.10.0/24) and assign that vlan2 tag to the voip phones so that they can be hot-plugged into the network, regardless of ports, get an IP on a separate subnet, then do QoS on the vlan subnet for call quality. I can get the phones to pull addresses from eth3 if I plug them directly in, but as that is my main uplink for the network, I need the 100.0.0/24 and the 10.0.10.0/24 subnets to share port 1 on the Netgear 24-port. However, from the Netgear manual example for 802.1Q vlans:
This seems to say that vlans always have to be on separate ports? So isn't this just port-based vlans, and not 802.1Q? Can I have port 1 assign vlan tag 1 for untagged packets, but pass vlan2 tagged packets along with their tag intact so the phones/vlan2 on the router can talk?Example
This example demonstrates several scenarios of VLAN use and how the switch will handle Tagged
and Untagged traffic.
1. Setup the following VLANs: VLAN 10, 20.
2. Configure the VLAN membership. Be sure to set all of them as follows.
• Setting up first VLAN group, VLAN ID = 10:
• Setting up second VLAN group, VLAN ID = 20:
3. Modify PVID Setting to apply previous two VLAN groups: Modify Default VLAN group
(VLAN ID = 1) to apply two new VLAN groups:
The specific ports above have the following Port VLAN ID settings:
Smart Switch Series Software Manual
IEEE 802.1Q Virtual Local Area Network (VLAN) B-3
July 2005
• Default VLAN: Port 7 – Port 26 (all U), VID = 1
• VLAN 1: Port 1 (U), Port 2 (U), Port 3 (T), VID = 10
• VLAN 2: Port 4 (U), Port 5 (T), Port 6 (U), VID = 20.
4. The following scenarios will produce results as described below:
(1). If an untagged packet enters Port 1, the switch will tag it with a VLAN tag value 10. The
packet will have access to Port 2 and Port 3. The outgoing packet will be stripped away its tag
becoming an untagged packet as it leaves Port 2. For Port 3, the outgoing packet will leave as
a tagged packet with a VLAN tag value 10.
(2). If a tagged packet with a VLAN tag value 10 enters Port 3, the packet will have access to
Port 1 and Port 2. If the packet leaves Port 1 and/or Port 2, it will be stripped away its tag
becoming an untagged packet as it leaves switch.
(3). If an untagged packet enters Port 4, switch will tag it with a VLAN tag value 20. The
packet will have access to Port 5 and Port 6. The outgoing packet will be stripped away its tag
becoming an untagged packet as it leaves Port 6. For Port 5, the outgoing packet will leave as
a tagged packet with a VLAN tag value 20.
I realize this is quite possibly a better question for Netgear's support forums, but I'm new enough to vlan setup that I think I might be configuring it wrong on the MT, and anyway, the readers of this forum are way smarter than the average person on the Netgear support forums.
