HP Manager Software manual Configuring WX System and Administrative Parameters

196CHAPTER 5: CONFIGURING WX SYSTEM AND ADMINISTRATIVE PARAMETERS

„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 configure STP:

1In the Create VLAN wizard, click Spanning Tree Setup. The Spanning Tree Setup page appears.

This page does not contain options for enabling fast convergence features.

2To enable STP, click Enabled.

3In the Bridge Priority box, specify this STP bridge’s priority (0 to 65,535). The default is 32,768 for the WX4400 and 49,152 for the WX1200 and WXR100.

The bridge with the lowest priority value becomes the root bridge for the spanning tree.

4In the Max Age box, specify the maximum age value (6 to 40 seconds), which controls how long information from other bridges is kept. The default is 20 seconds.

5In the Hello Time box, specify the interval (1 to 10 seconds) between each configuration message from the root bridge. The default is 2 seconds.

6In the Forward Delay box, specify the amount of time (4 to 30 seconds) a bridge waits after a topology change to begin forwarding data packets. The default is 15 seconds.