Cabletron Systems HSIM-W6 Installation Manual

Also see for CyberSWITCH HSIM-W6: Setup guide Configuration guide User guide User guide

Contents

Chapter 2: About the HSIM-W62-12HSIM-W6 Installation GuideISDN Back-upThe ISDN back-up feature provides a back-up link for a remote site or branch office when one ormore primary WAN interfaces for a frame relay circuit or a nailed-up PPP connection fails. TheWPIM-S/T serves as the backup medium for this primary connection. The WPIM-S/T uses theISDN interfaces to back-up any primary interfaces which have been configured for ISDN back-up.Time to Connect, Time to Disconnect, Connect Retries, Back-up Override, Input Idle Time-outand Output Idle Time-out, are the six back-up parameters used to manage the ISDN Back-upfeature on the HSIM-W6, and are described as follows:Time to Connect — Time to Connect allows the user to configure the amount of seconds theprimary interface can be in a failed state, before attempting to switch over to the back-up interface.Time to Disconnect — Time to Disconnect allows the user to configure the amount of secondsthe restored primary interface must remain connected, before attempting to switch over from theback-up interface.Connect Retries — Connect Retries allows the user to configure the number of tries to bring upthe back-up interface, before giving up.Backup Override — Backup Override forces the back-up interface to remain connected, anddoes not allow the back-up interface to switch back to the primary interface, even if the primaryinterface is restored.Input Idle Time-out — Input Idle Time-out allows the user to determine the amount of timenecessary for data packets to be received, before the interface is automatically disconnected.Output Idle Time-out — Output Idle Time-out allows the user to determine the amount of timenecessary for data packets to be transmitted, before the interface is automatically disconnected.The IP-OSPF Routing ProtocolOpen Shortest Path First (OSPF) is a link state routing protocol developed for Internet Protocol(IP) networks. OSPF distributes routing information between routers belonging to a singleautonomous system. In an autonomous system, routers exchange routing information through acommon routing protocol.OSPF was designed primarily for the Internet environment and supports variable length subnetmasks, Type of Service (TOS) based routing, packet authentication, and the tagging of externallyderived routing information.