HP Model Vehicle 6120 Figure 2-27.Example of VLAN ID Numbers Assigned in the VLAN Names Screen

Static Virtual LANs (VLANs)

802.1Q VLAN Tagging

N o t e	Each 802.1Q-compliant VLAN must have its own unique VID number, and that
	VLAN must be given the same VID in every device in which it is configured.
	That is, if the Red VLAN has a VID of 10 in switch X, then 10 must also be used
	for the Red VID in switch Y.

VID Numbers

Figure 2-27. Example of VLAN ID Numbers Assigned in the VLAN Names Screen

VLAN tagging gives you several options:

■Since the purpose of VLAN tagging is to allow multiple VLANs on the same port, any port that has only one VLAN assigned to it can be configured as “Untagged” (the default) if the authorized inbound traffic for that port arrives untagged.

■Any port with two or more VLANs of the same type can have one such VLAN assigned as “Untagged”. All other VLANs of the same type must be configured as “Tagged”. That is:

Port-Based VLANs	Protocol VLANs
A port can be a member of one untagged,	A port can be an untagged member of one
port-based VLAN. All other port-based	protocol-based VLAN of each protocol
VLAN assignments for that port must be	type. When assigning a port to multiple,
tagged.	protocol-based VLANs sharing the same
	type, the port can be an untagged member
	of only one such VLAN.
A port can be a tagged member of any port-	A port can be a tagged member of any
based VLAN. See above.	protocol-based VLAN. See above.

Note: A given VLAN must have the same VID on all 802.1Q-compliant devices in which the VLAN occurs. Also, the ports connecting two 802.1Q devices should have identical VLAN configurations.

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