Changing Vlan Spanning Tree Settings - 3Com WX4400 Reference Manual

Wireless lan mobility system wireless switch manager
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4 To add a port or port group to the VLAN and remove previous VLAN
5 To add a port or port group to the VLAN and retain previous VLAN
6 To tag a port or port group, select the Tag checkbox.
7 To change a tag value, change the number in the Tag Value field.
8 Click OK.
Changing VLAN
Spanning Tree
Settings
membership, select the port or port group and click Move.
To select multiple contiguous objects, press Shift while selecting.
To select multiple noncontiguous objects, press Control while
clicking.
Only ports configured as network ports are listed. You cannot add MAPs,
Distributed MAPs, or wired authentication ports to a VLAN.
membership, select the port or port group and click Add.
If you specify a tag value, 3Com recommends that you use the same value
as the VLAN number. 3Com switches do not require the VLAN number and
tag value to be the same, but some other vendors' devices do.
By default, the tag value of a port or port group the same as the VLAN ID.
The purpose of the Spanning Tree Protocol (STP) is to maintain a loop-free
network. A loop-free path is accomplished when a device recognizes a loop
in the topology and blocks one or more redundant paths.
Mobility System Software (MSS) supports 802.1D and Per-VLAN
Spanning Tree protocol (PVST+).
MSS uses 802.1D bridge protocol data units (BPDUs) on VLAN ports
that are untagged. However, each VLAN still runs its own instance of
STP, even if two or more VLANs contain untagged ports. To run a
single instance of STP in 802.1D mode on the entire switch, configure
all network ports as untagged members of the same VLAN.
MSS uses PVST+ BPDUs on VLAN ports that are tagged. PVST+ BPDUs
include tag information in the 802.1Q field of the BPDUs. MSS runs a
separate instance of PVST+ on each tagged VLAN.
When you create a VLAN, STP is disabled on the new VLAN by default,
regardless of the STP state of other VLANs on the WX switch.
Viewing and Configuring VLANs
219

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