Administration of the Avaya G350 Media Gateway - Avaya Support

Configuring the routing tableVia-interface static routePPP and frame relay allow for a Layer 3 interface to be established without knowing in advancethe next-hop on the other side of a serial link. In this case you can specify a Serial Layer 2interface or a GRE tunnel as a next-hop instead of providing a specific next-hop IP address.This is equivalent to specifying the node on the other side of the serial link as the next-hop whenits IP address is unknown. The via interface option is configured by specifying the type and thenumber of the serial interface using the ip route command.Note:Note: The interface used in the via route must have an IP address attached to it.For example, the command ip route 193.168.10.0 24 serial 2/1:1 creates a staticroute to the network 193.168.10.0 24 via the Serial 2/1:1 interface.A static route can have both via interface and IP addressed next-hops, with a maximum of threenext-hops. If such a combination is required, separate ip route commands should be usedfor the via interface static route and the IP addressed next-hop routes. Also, if more than one viainterface next-hops are required, each must be configured by separate ip route commands.Permanent static routeThe Avaya G350 Media Gateway enables you to configure a static route as a permanent route.Configuring this option prevents the static route from becoming inactive when the underlyingLayer 2 interface is down. This prevents routing table updates from being sent each time aninterface goes up or down when there is a fluctuating Layer 2 interface on the static route.Configure the permanent option using the ip route command.For example, the command ip route 193.168.10.0 24 serial 2/1:1 permanentcreates a permanent static route to the network 193.168.10.0 24 via the Serial 2/1:1 interface.Permanent static routes should not be configured over Serial Layer 2 interfaces that participatein a Primary-Backup pair. For more information on Backup interfaces, see Backup interfaces onpage 97.Discard routeDiscard route enables you to prevent forwarding traffic to specific networks. You can configure astatic route that drops all packets destined to the route. This is called a discard route, indicatedby the null0 parameter, and is configured using the ip route null0command.For example, the command ip route 134.66.0.0 16 Null0 configures the network134.66.0.0 16 as a discard route.Issue 3 January 2005 165