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C
3: C
HAPTER
ONFIGURING AND
Configuring a VLAN
M
P
ANAGING
ORTS AND
802.1Q Tagging
The tagging capabilities of the WX switch are very flexible. You can
assign 802.1Q tag values on a per-VLAN, per-port basis. The same VLAN
can have different tag values on different ports. In addition, the same tag
value can be used by different VLANs but on different network ports.
If you use a tag value, 3Com recommends that you use the same value as
the VLAN number. MSS does not require the VLAN number and tag value
to be the same, but some other devices do.
Do not assign the same VLAN multiple times using different tag values to
the same network port. Although MSS does not prohibit you from doing
so, the configuration is not supported.
Tunnel Affinity
WX switches configured as a Mobility Domain allow users to roam
seamlessly across MAP access points and even across WX switches.
Although a switch that is not a member of a user's VLAN cannot directly
forward traffic for the user, the switch can tunnel the traffic to another
WX switch that is a member of the user's VLAN.
If the WX switch that is not in the user's VLAN has a choice of more than
one other WX switch through which to tunnel the user's traffic, the
switch selects the other switch based on an affinity value. This is a
numeric value that each WX switch within a Mobility Domain advertises,
for each of its VLANs, to all other switches in the Mobility Domain. A
switch outside the user's VLAN selects the other operational switch that
has the highest affinity value for the user's VLAN to forward traffic for the
user.
If more than one WX switch has the highest affinity value, MSS randomly
selects one of the switches for the tunnel.
You can configure the following VLAN parameters:
VLAN number
VLAN name
Port list (the ports in the VLAN)
Per-port tag value (an 802.1Q value representing a virtual port in the
VLAN)
VLAN
S
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