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Managing the Module 2-63
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.