HP ProCurve Series 4100GL Management And Configuration Manual page 277

N o t e
The VLANs assigned to ports X3, X4, Y2, Y3, and Y4 can all be untagged
because there is only one VLAN assigned per port. Port X1 has multiple VLANs
assigned, which means that one VLAN assigned to this port can be untagged
and any others must be tagged. The same applies to ports X2, Y1, and Y5.
Switch X
Port Red VLAN Green VLAN
X1 Untagged Tagged
X2 Untagged Tagged
X3 No* Untagged
X4 Untagged No*
*"No" means the port is not a member of that VLAN. For example, port X3 is not
a member of the Red VLAN and does not carry Red VLAN traffic. Also, if GVRP
were enabled, "Auto" would appear instead of "No".
VLAN configurations on ports connected by the same link must match.
Because ports X2 and Y5 are opposite ends of the same point-to-point connec­
tion, both ports must have the same VLAN configuration; that is, both ports
configure the Red VLAN as "Untagged" and the Green VLAN as "Tagged".
To summarize:
VLANs Per Tagging Scheme
Port
1 Untagged or Tagged. If the device connected to the port is 802.1Q-compliant,
then the recommended choice is "Tagged".
2 or More 1 VLAN Untagged; all others Tagged
or
All VLANs Tagged
A given VLAN must have the same VID on any 802.1Q-compliant device in which the VLAN is
configured.
The ports connecting two 802.1Q devices should have identical VLAN configurations, as
shown for ports X2 and Y5, above.
Port-Based Virtual LANs (VLANs) and GVRP
Port-Based Virtual LANs (Static VLANs)
Switch Y
Port Red VLAN Green VLAN
Y1 Untagged Tagged
Y2 No* Untagged
Y3 No* Untagged
Y4 Untagged No*
Y5 Untagged Tagged
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