Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

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USER’S GUIDE110 CyberSWITCHD EFAULT R OUTESCONFIGURING DEFAULT R OUTESThe default route is a form of static route that is useful when there are a large number of networksthat can be accessed through a gateway. However, care must be taken when specifying a defaultroute. All IP datagrams with a destination IP address that do have an explicit routing table entrywill be sent to the default route. If this destination IP address is unreachable, it could result in alarge amount of unnecessary network traffic.U SING CFGEDIT1. Select Static Routes from the IP menu.2. When asked if this is a default route, answer “Y” for yes (for a definition of non-default routes,refer to Configuring Static Routes).3. Enter the next hop address of the next hop gateway that provides access to the target (sub-)network or host.4. Enter the metric value (usually the number of routers between the CyberSWITCH and thedestination.5. Enter the IP RIP propagation control (determines how a static route is propagated via IP RIP).U SING M ANAGE M ODE C OMMANDSRefer to the Manage Mode commands used to configure static routes (page 106). Default routes area subset of static routes. The same Manage Mode commands are used to configure both type ofroutes.DEFAULT ROUTE CONFIGURATION ELEMENTSNEXT HOP ADDRESSIP address using dotted decimal notation (or if an unnumbered WAN interface is used, thisconfiguration element is the device name) for the next hop gateway that provides access to thetarget (sub-) network or host. The IP address (or the device name) of the Next Hop must be on the(sub-) network connected to a defined interface.METRIC VALUEThe administrative distance to the destination of the entry. The administrative distance is typicallymeasured by the number of hop counts (number of routers) between the CyberSWITCH and thedestination, but it is up to you to assign proper value to each route entry. If multiple routes exist tothe same destination, the route with the least metric value will be chosen as its primary route. Thedefault metric value is 1. The range of metric values for default routes is from 1 to 15.You may manipulate the metric value to promote a certain default route, or to impede a defaultroute from being used. For example, if there is a route that in reality has several hops, but they areall over LAN connections, you may want to assign a low metric to this route so that a route is takenthat is local, thus, no toll charges. Or, perhaps there is a route with a low number of hops, but the