IPX RIP Filters

Routers on an IPX network exchange routing information through RIP packets. By limiting the propagation of this information, RIP filters provide limited security to IPX networks, reduce the bandwidth required for RIP updates, and reduce the memory requirements for routing tables.

There are two types of IPX RIP filters:

• Outgoing RIP filters

  Outgoing RIP filters restrict the propagation of routing information by the router. An outgoing RIP filter specifies the network to be filtered and the interface or interface group to which the filter should be applied. The filter is applied to all servers, users, and routers that receive the RIP information through that interface or interface group.

• Incoming RIP filters

  Incoming RIP filters let the router discard information about a particular network. The filtered network is not recorded in the local forwarding table and cannot be propagated to other routers, servers, or users. The filter includes the network and the source of the route. The source identifies the interface or interface group from which the routing information was received. This is the most effective route filter for improving security.

  WARNING:  RIP filters work only on routers running the RIP protocol. They do not work for routers running the NLSP protocol. Use RIP filters with care because they can partition a physical network into two or more segments.