3Com 3CRWXR10095A, 3CRWX120695A WXR100 manual To tag a port or port group, select the Tag checkbox

210CHAPTER 6: CONFIGURING WX SYSTEM PARAMETERS

6To tag a port or port group, select the Tag checkbox.

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.

7To change a tag value, change the number in the Tag Value field.

By default, a port or port group’s tag value is the same as the VLAN ID.

8Click OK.

Changing VLAN The purpose of the Spanning Tree Protocol (STP) is to maintain a loop-free Spanning Tree network. A loop-free path is accomplished when a device recognizes a loop

Settings 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.

The IEEE 802.1D spanning tree specifications refer to networking devices that forward Layer 2 traffic as bridges. In this context, a WX switch is a bridge. Where this manual or the product interface uses the term bridge, you can assume the term is applicable to the WX switch.

To change a VLAN’s STP settings:

1Access the VLAN table:

a Select the Configuration tool bar option.

b In the Organizer panel, click the plus sign next to the WX switch. c Click the plus sign next to System.

d Select VLANs.