Cabletron Systems WPIM-DDS Installationsanleitung PDF herunterladen (Seite 26)

Chapter 2: About the HSIM-W6

2-12 HSIM-W6 Installation Guide

ISDN Back-up

The ISDN back-up feature provides a back-up link for a remote site or branch ofﬁce when one or

more primary WAN interfaces for a frame relay circuit or a nailed-up PPP connection fails. The

WPIM-S/T serves as the backup medium for this primary connection. The WPIM-S/T uses the

ISDN 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-out

and Output Idle Time-out, are the six back-up parameters used to manage the ISDN Back-up

feature on the HSIM-W6, and are described as follows:

Time to Connect — Time to Connect allows the user to conﬁgure the amount of seconds the

primary 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 seconds

the restored primary interface must remain connected, before attempting to switch over from the

back-up interface.

Connect Retries — Connect Retries allows the user to conﬁgure the number of tries to bring up

the back-up interface, before giving up.

Backup Override — Backup Override forces the back-up interface to remain connected, and

does not allow the back-up interface to switch back to the primary interface, even if the primary

interface is restored.

Input Idle Time-out — Input Idle Time-out allows the user to determine the amount of time

necessary 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 time

necessary for data packets to be transmitted, before the interface is automatically disconnected.

The IP-OSPF Routing Protocol

Open 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 single

autonomous system. In an autonomous system, routers exchange routing information through a

common routing protocol.

OSPF was designed primarily for the Internet environment and supports variable length subnet

masks, Type of Service (TOS) based routing, packet authentication, and the tagging of externally

derived routing information.

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Cabletron Systems WPIM-DDS Installationsanleitung Seite 26