Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

Note Each bridge in a spanning tree adopts the interval between hello BPDUs, the forward delay interval, and the maximum idle interval parameters of the root bridge, regardless of what its individual configuration might be.

Adjusting the Interval between Hello BPDUs

You can specify the interval between hello BPDUs. To adjust this interval, use the following command in global configuration mode:

Command

Purpose

 

 

bridge bridge-group hello-timeseconds

Specifies the interval between hello BPDUs.

 

 

Defining the Forward Delay Interval

The forward delay interval is the amount of time spent listening for topology change information after an interface has been activated for bridging and before forwarding actually begins. To change the default interval setting, use the following command in global configuration mode:

Command

Purpose

 

 

bridge bridge-groupforward-time seconds

Sets the default of the forward delay interval.

 

 

Defining the Maximum Idle Interval

If a bridge does not hear BPDUs from the root bridge within a specified interval, it assumes that the network has changed and recomputes the spanning-tree topology. To change the default interval setting, using the following command in global configuration mode:

Command

Purpose

 

 

bridge bridge-group max-ageseconds

Changes the amount of time a bridge will wait to hear BPDUs from

 

the root bridge.

 

 

Disabling the Spanning Tree on an Interface

When a loop-freepath exists between any two bridged subnetworks, you can prevent BPDUs generated in one transparent bridging subnetwork from impacting nodes in the other transparent bridging subnetwork, yet still permit bridging throughout the bridged network as a whole. For example, when transparently bridged LAN subnetworks are separated by a WAN, BPDUs can be prevented from traveling across the WAN link.

To disable the spanning tree on an interface, use the following command in interface configuration mode:

Command

Purpose

 

 

bridge-group bridge-groupspanning-disabled

Disables the spanning tree on an interface.

 

 

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-54

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Cisco Systems BC-23 manual Disabling the Spanning Tree on an Interface, Adjusting the Interval between Hello BPDUs, BC-54

BC-23 specifications

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