Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

Contents

Small Office Remote Access Switch 103CONFIGURING B ASIC IP ROUTINGIP Network InterfacesIP H OST O PERATING M ODE AND THE IP N ETWORK INTERFACESOnly one network interface can be configured when the IP operating mode is host. The networkinterface configuration is not much different from the others available in router mode except thatthe following configuration items will not be asked:• Network Interface Type• Network Interface Name• IP RIP Send ControlU SING M ULTIPLE IP A DDRESSESYou may use multiple IP addressing for system backup and/or network flatteningimplementations. A discussion of both follows.Redundant Configurations for BackupTo implement a backup system, you will need two CyberSWITCHs with redundant configurationsand a VRA manager.LAN interfaces on the CyberSWITCH will have primary LAN and IP addresses and may optionallyhave one or more secondary MAC and IP addresses. You can dynamically add secondary MAC andIP addresses under the control of the VRA workstation.Typically, you would use primary MAC and IP addresses when transmitting datagrams directly toa particular CyberSWITCH node, and secondary MAC and IP addresses when transmittingdatagrams through the CyberSWITCH to other nodes. You would then use the VRA manager tomonitor identically configured CyberSWITCH nodes on the same LAN. Should the VRA managernotice some condition which prevents one of the CyberSWITCH nodes from properly performingits function (for example, “link down”), it will order the other CyberSWITCH node to take over thefaulty node’s duties. The other CyberSWITCH node does so by taking on the identity (the MACand IP addresses) of the faulty node.Network FlatteningWith IP networks, the total number of available IP addresses is a finite number, and that number israpidly diminishing. Hosts are typically assigned static addresses; they generally require extensivelocal configuration in order to operate properly within their defined networks. To allow the IPnetworks to become more easily and efficiently manageable, we suggest a network flatteningapproach. Network flattening is a concept which can:• remove the address hierarchy from the network, and• remove the requirements that all end nodes need to know the topology of the network (or theaddress of the default router) to which they attach.With network flattening, you may draw IP addresses for new nodes from remaining address spacefrom attached subnets. This more efficiently uses the network’s address space, since multiplesubnets may coexist on the same physical network. The following features help implement theconcept of network flattening:• Proxy ARPHosts on flattened networks believe that any host they wish to reach is on a network directlyattached to them. When a local device on a flattened network is attempting to communicate