SmartSwitch Router User Reference Manual 133Chapter 7: Routing Policy Configuration GuideExamples of Export PoliciesExample 1: Exporting to RIPExporting to RIP is controlled by any of protocol, interface or gateway. If more than one isspecified, they are processed from most general (protocol) to most specific (gateway).It is not possible to set metrics for exporting RIP routes into RIP. Attempts to do this aresilently ignored.If no export policy is specified, RIP and interface routes are exported into RIP. If any policyis specified, the defaults are overridden; it is necessary to explicitly specify everything thatshould be exported.RIP version 1 assumes that all subnets of the shared network have the same subnet maskso it is only able to propagate subnets of that network. RIP version 2 removes thatrestriction, and is capable of propagating all routes when not sending version 1compatible updates.To announce routes which specify a next hop of the loopback interface (i.e. static andinternally generated default routes) via RIP, it is necessary to specify the metric at somelevel in the export policy. Just setting a default metric for RIP is not sufficient. This is asafeguard to verify that the announcement is intended.For all examples in this section, refer to the configuration shown in Figure 11 on page 127.The following configuration commands for router R1:• Determine the IP address for each interface• Specify the static routes configured on the router• Determine its RIP configuration!++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++! Create the various IP interfaces.!++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++interface create ip to-r2 address-netmask 120.190.1.1/16 port et.1.2interface create ip to-r3 address-netmask 130.1.1.1/16 port et.1.3interface create ip to-r41 address-netmask 140.1.1.1/24 port et.1.4interface create ip to-r42 address-netmask 140.1.2.1/24 port et.1.5interface create ip to-r6 address-netmask 160.1.1.1/16 port et.1.6interface create ip to-r7 address-netmask 170.1.1.1/16 port et.1.7!++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++! Configure a default route through 170.1.1.7!++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ip add route default gateway 170.1.1.7!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++! Configure default routes to the 135.3.0.0 subnets reachable through! R3.
