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24-port NWay Ethernet Switch User’s Guide

Switch Management 45

In the above example, step 4 is the key element. Because the packet

has 802.1Q VLAN data encoded in it’s header, the ingress port can

make VLAN-based decisions about its delivery --- whether server #2

is attached to a port that is a member of VLAN 2 and thus should

the packet be delivered, the queuing priority to give to the packet,

etc. It can also perform these functions for VLAN 1 packets as well,

and in fact, for any tagged packet it receives regardless of the

VLAN number.

If the ingress port in step 4 were connected to a non-802.1Q-

compliant device and was thus receiving untagged packets, it

would tag its own PVID onto the packet and use this information to

make forwarding decisions. Thus, the packets coming from the non-

compliant device would automatically be placed on the ingress

ports VLAN and could only communicate with other ports that are

members of this VLAN.

Удалено: Using the Console

Interface