Configuring Spanning Tree Protocol (STP)
6 - 19
You also can display the STP states of all ports by entering a command such as the following, which uses the brief
parameter:
In this example, only one port, 3/11, is forwarding traffic toward the root bridge.
USING THE WEB MANAGEMENT INTERFACE
To display STP information for a specific port, use the same method as the one described in “Displaying STP
Information for an Entire Device” on page 6-7:
1. Log on to the device using a valid user name and password for read-only or read-write access. The System
configuration panel is displayed.
2. Click on the plus sign next to Monitor in the tree view to display the monitoring options.
3. Select the STP
link to display the STP bridge and port parameters.
Configuring Advanced Features
This section describes how to configure the following features:
• Fast Port Span
• Fast Uplink Span
• Single-instance STP
• SuperSpan
• STP per VLAN group
• Per VLAN Spanning Tree+ (PVST+) Compatibility
Fast Port Span
When STP is running on a device, message forwarding is delayed during the spanning tree recalculation period
following a topology change. The STP forward delay parameter specifies the period of time a bridge waits before
forwarding data packets. The forward delay controls the listening and learning periods of STP reconvergence.
You can configure the forward delay to a value from 4 – 30 seconds. The default is 15 seconds. Thus, using the
standard forward delay, convergence requires 30 seconds (15 seconds for listening and an additional 15 seconds
for learning) when the default value is used.
This slow convergence is undesirable and unnecessary in some circumstances. The Fast Port Span feature
allows certain ports to enter the forwarding state in four seconds. Specifically, Fast Port Span allows faster
HP9300(config)# show interface brief
Port Link State Dupl Speed Trunk Tag Priori MAC Name
1/1 Down None None None None No level0 00e0.52a9.bb00
1/2 Down None None None None No level0 00e0.52a9.bb01
1/3 Down None None None None No level0 00e0.52a9.bb02
1/4 Down None None None None No level0 00e0.52a9.bb03
1/5 Down None None None None No level0 00e0.52a9.bb04
1/6 Down None None None None No level0 00e0.52a9.bb05
1/7 Down None None None None No level0 00e0.52a9.bb06
1/8 Down None None None None No level0 00e0.52a9.bb07
.
.
some rows omitted for brevity
.
3/10 Down None None None None No level0 00e0.52a9.bb4a
3/11 Up Forward Full 100M None No level0 00e0.52a9.bb49
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