Configuring Spanning Tree Protocol (Stp) And Advanced Stp Features; Configuring Standard Stp Parameters - HP ProCurve 9304M Installation And Configuration Manual

The Spanning Tree Protocol (STP) eliminates Layer 2 loops in networks, by selectively blocking some ports and
allowing other ports to forward traffic, based on global (bridge) and local (port) parameters you can configure.
This chapter describes how to configure Spanning Tree Protocol (STP) parameters on HP ProCurve Routing
Switches.
This chapter also describes advanced Layer 2 features that enable you to overcome limitations in the standard
802.1d Spanning Tree Protocol (STP). These are the advanced features:
• Fast Port Span
• Fast Uplink Span
• Single-instance STP
• SuperSpan
• STP per VLAN group
• Per VLAN Spanning Tree (PVST) and PVST+ Compatibility
Configuration procedures are provided for the standard STP bridge and port parameters as well as advanced STP
parameters.
• To configure standard STP parameters, see "Configuring Standard STP Parameters".
• To configure advanced parameters, see "Configuring Advanced STP Features" on page 8-19.

Configuring Standard STP Parameters

HP Routing Switches support standard STP as described in the IEEE 802.1D specification. STP is disabled by
default on Routing Switches.
By default, each port-based VLAN on an HP device runs a separate spanning tree (a separate instance of STP).
An HP device has one port-based VLAN (VLAN 1) by default that contains all the device's ports. Thus, by default
each HP device has one spanning tree. However, if you configure additional port-based VLANs on an HP device,
then each of those VLANs on which STP is enabled and VLAN 1 all run separate spanning trees.
If you configure a port-based VLAN on the device, the VLAN has the same STP state as the default STP state on
the device. On Routing Switches, new VLANs have STP disabled by default. You can enable or disable STP in
each VLAN separately. In addition, you can enable or disable STP on individual ports.
Configuring Spanning Tree Protocol (STP)
and Advanced STP Features
Chapter 8
8 - 1