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an 802.1Q-compliant switch, tagging should be enabled so the
other switch can take VLAN data into account when making
forwarding decisions. If an egress connection is to a non-compliant
switch or end-station, tags should be stripped so the (now normal
Ethernet) packet can be read by the receiving device.
VLANs Over 802.1Q-compliant Switches
When switches maintaining the same VLANs are 802.1Q-compliant,
it is possible to use tagging. Tagging puts 802.1Q VLAN information
into each packet header, enabling other 802.1Q-compliant switches
that receive the packet to know how to treat it. Upon receiving a
tagged packet, an 802.1Q-compliant switch can use the information
in the packet header to maintain the integrity of VLANs, carry out
priority forwarding, etc.
Data transmissions between 802.1Q-compliant switches take place as
shown below.
Switch Management Concepts
Stackable NWay Ethernet Switch User's Guide
47
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