Bridge Spanning Tree configuration

Bridge Spanning Tree configuration

Spanning tree bridge parameters can be configured for each Spanning Tree Group. STP bridge parameters include:

•Bridge priority

•Bridge hello time

•Bridge maximum age

•Forwarding delay

•Current bridge configuration

The following table describes the Bridge Spanning Tree Configuration commands.

Table 84 Bridge Spanning Tree Configuration commands

Command	Description
spanning-tree stp {<1-32>}	Configures the bridge priority. The bridge priority parameter controls
bridge priority {<0-65535>}	which bridge on the network is the STP root bridge.
	To make this switch the root bridge, configure the bridge priority lower
	than all other switches and bridges on your network. The lower the value,
	the higher the bridge priority. The range is 0 to 65535, and the default is
	32768.
	RSTP/MSTP: The range is 0 to 61440, in steps of 4096 (0, 4096,
	8192...), and the default is 32768.
	This command does not apply to MSTP. See the “Common Internal
	Spanning Tree configuration” section for more information.
	Command mode: Global configuration

spanning-tree stp {<1-32>} bridge hello-time {<1-10>}

Configures the bridge hello time. The hello time specifies how often the root bridge transmits a configuration bridge protocol data unit (BPDU).

Any bridge that is not the root bridge uses the root bridge hello value. The range is 1 to 10 seconds, and the default is 2 seconds.

This command does not apply to MSTP. See the “Common Internal Spanning Tree configuration” section for more information. Command mode: Global configuration

spanning-tree stp {<1-32>} bridge maximum-age {<6-40>}

Configures the bridge maximum age. The maximum age parameter specifies the maximum time the bridge waits without receiving a configuration bridge protocol data unit before it reconfigures the STP network. The range is 6 to 40 seconds, and the default is 20 seconds.

This command does not apply to MSTP. See the “Common Internal Spanning Tree configuration” section for more information. Command mode: Global configuration

spanning-tree stp {<1-32>} bridge forward-delay {<4-30>}

Configures the bridge forward delay parameter. The forward delay parameter specifies the amount of time that a bridge port has to wait before it changes from the listening state to the learning state and from the learning state to the forwarding state. The range is 4 to 30 seconds, and the default is 15 seconds.

This command does not apply to MSTP. See the “Common Internal Spanning Tree configuration” section for more information. Command mode: Global configuration

show spanning-tree stp {<1-32>}	Displays the current bridge STP parameters.
bridge	Command mode: All

When configuring STP bridge parameters, the following formulas must be used:

•2*(fwd-1)> mxage

•2*(hello+1) < mxage

Configuration Commands 79

N8406-022 specifications

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