Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring Frame RelayCustomizing Frame Relay for Your NetworkFigure 30Using Subinterfaces to Provide Full Connectivity on a Partially MeshedFrame Relay NetworkBBACACEDEDNetwork A: Partially meshed Frame Relaynetwork without full connectivityNetwork B: Fully meshed Frame Relaynetwork with full connectivityBACEDNetwork C: Partially meshed Frame Relay network with full connectivity(configuring subinterfaces)62873Using subinterfaces, you can subdivide the Frame Relay network into three smaller subnetworks(network C) with separate network numbers. Nodes A, B, and C are connected to a fully meshednetwork, and nodes C and D, as well as nodes D and E, are connected via point-to-point networks. Inthis configuration, nodes C and D can access two subinterfaces and can therefore forward packetswithout violating split horizon rules. If transparent bridging is being used, each subinterface is viewedas a separate bridge port.Subinterfaces can be configured for multipoint or point-to-point communication. (There is no default.)To configure subinterfaces on a Frame Relay network, use the following commands beginning in globalconfiguration mode:33