Filter
Top Products
Managing the Hub 2-63
The SmartSwitch 2000 Chassis View
portÕs 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 switchÕs aging time, the transmitting
stationÕs source address and VLAN will be aged out for that port; no unknown
destination frames belonging to the stationÕs 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 portÕs 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 conÞgured 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 conÞgured 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 trafÞc through the port. 1d Trunk ports are conÞgured 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).