Cabletron Systems Cabletron CyberSWITCH CSX5500 User Manual

Also see for CyberSWITCH 5500: Quick start Manual

Contents

Central Site Remote Access Switch 267CONFIGURING ADVANCED BRIDGINGSpanning Tree ProtocolSPANNING T REE PROTOCOL CONFIGURATION E LEMENTSOnly the Ethernet-2 adapter supports the Spanning Tree Protocol in its entirety. Outlined below arethe Spanning Tree configuration elements that the User can define. These elements are availablewhen the system is running the local bridging option.S PANNING TREE P ROTOCOL O PTION S TATUSYou can enable or disable the Spanning Tree protocol for CyberSWITCHes with Ethernet-2adapters.BRIDGE PRIORITYThe configured priority for this system. The priority can range from 0 to 65535. The default is 32768.LAN PORT <1 OR 2> PRIORITYThe configured priority for the indicated port.The priority can range from 0 to 255. The default is128.LAN PORT <1 OR 2> PATH COSTThe configured path cost for this port. The cost can range from 1 to 65535. The default is 100.BRIDGE MAX AGEThe 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 TIMEThe 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 DELAYThe 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 usingbridge dial out, you may wish to increase this value to prevent the connection from aging out beforethe call is made.SPANNING T REE PROTOCOL BACKGROUND I NFORMATIONSpanning Tree Protocol is used to find paths among networks. The algorithm can generate allpossible paths and choose one. If that path becomes unavailable because a device goes down, analternate path is found. This algorithm is used by bridges to find the best path between devices, andto make sure that no path loops occur. For a more detailed explanation of the Spanning Treeprotocol, refer to the 802.1d specification available from IEEE.