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C-3
Compaq SW3322/SW3323 Dual-Speed Switch User Guide
Writer: Fran Spragens Project: Virtual Lans (VLANs) Comments:
File Name:3324_c.doc Last Saved On:3/16/99 11:47 AM
VLAN Hybrid Ports
A VLAN hybrid port is used to connect one or more VLAN-aware or VLAN-
unaware devices attached to it. Both tagged and untagged frames can be
transmitted on hybrid ports.
In example 1 in Figure C-3A, two different VLANs are configured as X and Y.
A packet arrives (1) with a tag for VLAN Z, goes straight through the switch
(2) and back out (3), destined for VLAN Z, a VLAN Z-aware end-user
workstation. If the packet already has the tag attached, then the switch uses that
information, transparent to the VLAN configuration of the incoming port used
for that packet’s arrival. The switch forwards the packet so that it reaches its
ultimate destination.
In Example 2 in Figure C-3A, a similar scenario to Example 1 occurs, except
that the incoming packet (1) is tagged with a VLAN Y tag. The packet is being
sent (2) to a port that belongs to VLAN Y. Since VLAN Y exists on the port,
the tag is stripped off (3).
Figure C-3A VLAN Hybrid Ports (Examples 1 and 2)