The maximum-path command is simply use to change the number of parallel paths that can be installed in the RIB from a given protocol. For instance, the default for OSPF, ISIS, EIGRP and RIP is 4 and for BGP is 1. The maximum number of path is 6 or 8 depending on the IOS version you are running.
Hope this helps,
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México