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110 CHAPTER 8: CONFIGURING BRIDGING AND ROUTINGThe IPX router ignores any dynamic updates or backup routes on thenetwork when a static route is configured for a specific network. Staticroutes are recommended only where the network topology remainsconstant.Define a static route using:ADD ! -IPX ROUte {& | Default} [] address> [Override] [hdrfmt]Defining a Default RouteYou can configure a static default route, which is subsequently addedto the routing table and propagated by NRIP or NLSP. Once a defaultroute is specified, packets destined to unknown networks (networksnot explicitly known or listed in the routing table) are routed to thedefault router for subsequent routing. You can configure only onedefault route per port.Use this procedure to configure a default route so that unknowndestination packets can be properly forwarded. Define a static defaultroute using:ADD ! -IPX ROUte Default Override OptionIf a destination network is reachable with both a static route and alearned route, the router uses the static route unless you specify theoptional Override value in the ADD ROUte command. In that case, if alearned route is available, regardless of precedence, it overrides the staticroute. You should specify Override for a path you want to use for routeredundancy. The Override value is entered at the end of the command.Configuring RouteRedundancy Using aStatic RouteIf your primary line fails, you can use a back-up line to route traffic byconfiguring route redundancy.To configure a back-up line for routeredundancy, configure the line according to Chapter 7.If you use a static route on the back-up line, but use a dynamic routingprotocol like NLSP on the primary line, use the Override option asdescribed in “Override Option” on page 110.If you are using static routes for both lines, set the hops for the back-upline to a higher number using the syntax in “Configuring Static Routes”on page 109.
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