Enterasys Networks 700 manual Configuring Your 802.1Q Vlans, 802.1Q Port Types, 1Q Trunk, 1d Trunk

The MultiSwitch 700 Device View

If a port receives a tagged frame that specifies a VLAN other than the one assigned to the port, the switch will dynamically associate that frame’s source address and VLAN with the port (i.e., add that frame’s VLAN to the receiving port’s egress list). Dynamically learned VLANs are subject to the same aging rules as source addresses (e.g., if a tagged frame belonging to a dynamically learned VLAN is not received by the port within the switch’s aging time, the transmitting station’s source address and VLAN will be aged out for that port; no unknown destination frames belonging to the station’s VLAN will be transmitted through the port until the VLAN is dynamically learned once again). Only tagged frames can cause the switch to dynamically change a port’s egress list.

802.1Q Port Types

Each 802.1Q switch port is assigned a mode of operation. Port types include:

1Q Trunk

If VLAN membership is to apply to users across several switches, ports used to connect 802.1Q-aware devices are configured to use 1Q Trunk mode. In this mode, all frames (except BPDUs) are transmitted with a tag header included in the frame, allowing VLAN frames to maintain their VLAN ID across multiple switches. Any untagged frames received by the port are dropped. 1Q Trunk ports are configured to be members of all VLANs.

1d Trunk

This mode allows a port to transmit to a traditional (802.1d) switch fabric. These ports transmit only untagged frames, and the switch expects to receive only untagged traffic through the port. 1d Trunk ports are configured to be members of all VLANs. This mode can be used to share a connection among multiple VLANs (e.g., sharing a server between two or more separate VLANs).

Hybrid

Hybrid mode (enabled by default) allows a port to receive and transmit both tagged and untagged frames. In this mode, the port will be a member of its statically assigned VLAN, as well as any dynamically learned VLANs (remember, dynamically learned VLANs are subject to the same aging rules as source addresses).

Configuring Your 802.1Q VLANS

Before you can define and configure 802.1Q port-based VLANs on your device, you must activate the device’s 802.1Q operational mode; this operation can be performed using Local Management or the Mib Tools application. Using Mib Tools, 802.1Q mode can be activated through the Container Mib’s Logical Entry Table (contLogicalEntryTable). When the 802.1Q component is activated, the device will automatically reset, and begin operating in 802.1Q mode.

Managing the Module 2-63