HP ProCurve 9304M Installation And Configuration Manual page 257

The hello-time <value> parameter specifies the interval between two hello packets. This parameter can have a
value from 1 – 10 seconds. The default is 2 seconds; however, set this value to at least 4 seconds to provide
enough time for BPDUs to reach the root bridge before the timeout period expires on a non-root bridge port.
The max-age <value> parameter specifies the amount of time the device waits to receive a hello packet before it
initiates a topology change. You can specify a value from 6 – 40 seconds. The default is 20 seconds.
Beginning with software release 07.6.04, the value of max-age must be greater than the value of forward-delay
to ensure that the downstream bridges do not age out faster than the upstream bridges (those bridges that are
closer to the root bridge).
The force-version <value> parameter forces the bridge to send BPDUs in a specific format. You can specify one
of the following values:
• 0 – The STP compatibility mode. Only STP (or legacy) BPDUs will be sent.
• 2 – The default. RST BPDUs will be sent unless a legacy bridge is detected. If a legacy bridge is detected,
STP BPDUs will be sent instead.
The default is 2.
The priority <value> parameter specifies the priority of the bridge. You can enter a value from 0 – 65535. A
lower numerical value means a the bridge has a higher priority. Thus, the highest priority is 0. The default is
32768.
You can specify some or all of these parameters on the same command line. If you specify more than one
parameter, you must specify them in the order shown above, from left to right.
USING THE WEB MANAGEMENT INTERFACE
You cannot modify 802.1W bridge parameters using the Web management interface.
Changing Port Parameters
The 802.1W port commands can be enabled on individual ports or on multiple ports, such as all ports that belong
to a VLAN.
The 802.1W port parameters are preconfigured with default values. If the default parameters meet your network
requirements, no other action is required.
You can change the following 802.1W port parameters using the following methods.
USING CLI
HP9300(config)# vlan 10
HP9300(config-vlan-10)# spanning-tree 802-1w ethernet 1/5 path-cost 15 priority 64
Syntax: spanning-tree 802-1w ethernet <portnum> path-cost <value> | priority <value> | [admin-edge-port] |
[admin-pt2pt-mac] | [force-migration-check]
The ethernet <portnum> parameter specifies the interface used.
The path-cost <value> parameter specifies the cost of the port's path to the root bridge. 802.1W prefers the path
with the lowest cost. You can specify a value from 1 – 20,000,000. Table 1 shows the recommended path cost
values from the IEEE standards.
Link Speed
Less than 100 kilobits per
second
Configuring Spanning Tree Protocol (STP) and Advanced STP Features
Table 1: Recommended Path Cost Values of 802.1W
Recommended
(Default) 802.1W Path
Cost Values
200,000,000
Recommended 802.1W Path
Cost Range
20,000,000 – 200,000,000
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