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Introduction
1.3.5 Switch Mode
The unit operates in either an 802.1D or 802.1Q mode. The mode must be
selected by the user and applies to all ports. The unit will not operate in a mixed
mode. The default is to operate in 802.1D mode.
For further information, refer to Switch Command in Chapter 2, Enhancements to
LCM Commands.
1.3.6 Assigning Ports to a VLAN
A port becomes a member of a VLAN, by using the VLAN command.
For further information, refer to the Port Command in Chapter 2, Enhancements
to LCM Commands.
1.3.7 Default Port VLAN ID
If the unit is operating in 802.1Q mode, then each port will be configured with a
default port VLAN ID (PVID). The default value for each port will be the default
VLAN ID of 0x001. You are allowed to modify this on a per port basis.
When 802.1Q was developed, it was decided to configure a default VLAN ID for
a port. If a packet is received on a port that does not have a VLAN ID or does not
have a VLAN ID of zero, the default VLAN ID will be inserted. Once this tag is
in place the packet is sent to the forwarding engine. Once the forwarding engine
receives it, it will use this tag to determine which VLAN to restrict this packet to.
The sub-command of the port command known as the VLAN sub-command is
used to set the default VLAN ID for the port.
For further information, refer to Port Command in Chapter 2, Enhancements to
LCM Commands.
NOTE
There is a sub-command of the port command known as the
VLAN sub-command. This is not used to make a port a member
of the VLAN, and is not directly used in the forwarding and
filtering decision.