Defining the Maximum Parallel Routes Supported by the Routing Protocol

You can add routing table entries manually (as static routes), or they are formed as routers discover their neighbors and exchange routing tables (via OSPF, BGP, and other routing protocols).

To control the maximum number of parallel routes that the routing protocol (BGP, IS-IS, OSPF, or RIP) can support:

• Issue the maximum paths command in Router Configuration mode.
  host1(config-router)#maximum-paths 2

  The maximum number of routes can be in the range 1–16 for BGP, IS-IS, OSPF, or RIP. Use the no version to restore the default value, 1 for BGP or 4 for IS-IS, OSPF, or RIP.