Enterasys Networks CSX5500, CSX6000, CSX7000 manual Spanning Tree Protocol Configuration Elements

CONFIGURING ADVANCED BRIDGING

Spanning Tree Protocol

SPANNING TREE PROTOCOL CONFIGURATION ELEMENTS

Only the Ethernet-2 adapter supports the Spanning Tree Protocol in its entirety. Outlined below are the Spanning Tree configuration elements that the User can define. These elements are available when the system is running the local bridging option.

SPANNING TREE PROTOCOL OPTION STATUS

You can enable or disable the Spanning Tree protocol for CyberSWITCHes with Ethernet-2 adapters.

BRIDGE PRIORITY

The configured priority for this system. The priority can range from 0 to 65535. The default is 32768.

LAN PORT <1 OR 2> PRIORITY

The configured priority for the indicated port.The priority can range from 0 to 255. The default is 128.

LAN PORT <1 OR 2> PATH COST

The configured path cost for this port. The cost can range from 1 to 65535. The default is 100.

BRIDGE MAX AGE

The configured maximum age-time for this system. This is used when the system is the root bridge. The unit of age is in seconds, and ranges from 6 to 40. The default is 20 seconds.

BRIDGE HELLO TIME

The configured hello time interval for this system. This is used when the system is the root bridge. The unit is in seconds, and ranges from 1 to 10. The default is 2 seconds.

BRIDGE FORWARD DELAY

The configured forward delay time for this system. This is used when the system is the root bridge. The unit is in seconds and range from 4 to 30. The default is 15 seconds.

This parameter is available on systems with Ethernet-1 or Ethernet-2 adapters. If you are using bridge dial out, you may wish to increase this value to prevent the connection from aging out before the call is made.

SPANNING TREE PROTOCOL BACKGROUND INFORMATION

Spanning Tree Protocol is used to find paths among networks. The algorithm can generate all possible paths and choose one. If that path becomes unavailable because a device goes down, an alternate path is found. This algorithm is used by bridges to find the best path between devices, and to make sure that no path loops occur. For a more detailed explanation of the Spanning Tree protocol, refer to the 802.1d specification available from IEEE.

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