Cabletron Systems CyberSWITCH CSX400 Installation Manual

Also see for CyberSWITCH CSX400: Setup guide Configuration guide User guide User guide User guide

Contents

Chapter 2: About the CSX4002-12CyberSWITCH CSX400 and CSX400-DC Installation GuideInput Idle Time-out — Input Idle Time-out allows you to determine the amount of time necessaryfor data packets to be received, before the interface is automatically disconnected.Output Idle Time-out — Output Idle Time-out allows you 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.OSPF, based upon link-state technology, was developed by the Internet Engineering Task Force(IETF). The IETF developed OSPF based upon the shortest path first algorithm to serve large,heterogeneous networks.A key feature of OSPF is the speed in which it responds to topological changes, commonlyreferred to as “convergence time.” OSPF generates a minimal amount of routing protocol trafficcompared to most distance vector protocols.Cabletron’s implementation of OSPF is based on RFC 1247 — OSPF Version 2 and RFC 1253 —OSPF Version 2 Management Information Base.IP-OSPF HierarchyIP-OSPF operates within a hierarchy of entities:Autonomous SystemAn Autonomous System (AS) is a set of routers and networks under a common administration.Routers inside an AS are called “interior gateways” and the protocol is called Interior GatewayProtocol (IGP). OSPF is an IGP.An autonomous system may contain one or more networks, but each network within theautonomous system may or may not support subnetting. Each autonomous system possesses a16-bit decimal number assigned by the Network Information Center (NIC). Every routerbelonging to an autonomous system must be configured with the same autonomous systemnumber.