PowerConnect B-Series FCX Configuration Guide xxvii53-1002266-01Optional configuration tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1004Changing the Keep Alive Time and Hold Time . . . . . . . . . . . 1004Changing the BGP4 next-hop update timer . . . . . . . . . . . . . 1005Enabling fast external fallover. . . . . . . . . . . . . . . . . . . . . . . . 1005Changing the maximum number of paths forBGP4 load sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1006Customizing BGP4 load sharing . . . . . . . . . . . . . . . . . . . . . . .1007Specifying a list of networks to advertise. . . . . . . . . . . . . . . 1008Changing the default local preference . . . . . . . . . . . . . . . . . 1009Using the IP default route as a valid next hop fora BGP4 route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1010Advertising the default route. . . . . . . . . . . . . . . . . . . . . . . . . .1010Changing the default MED (Metric) used forroute redistribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1010Enabling next-hop recursion . . . . . . . . . . . . . . . . . . . . . . . . . .1011Changing administrative distances . . . . . . . . . . . . . . . . . . . .1014Requiring the first AS to be the neighbor AS . . . . . . . . . . . . .1015Disabling or re-enabling comparison of the AS-Path length .1015Enabling or disabling comparison of the router IDs . . . . . . .1016Configuring the Layer 3 Switch to always compareMulti-Exit Discriminators (MEDs) . . . . . . . . . . . . . . . . . . . . . .1016Treating missing MEDs as the worst MEDs . . . . . . . . . . . . . .1017Configuring route reflection parameters . . . . . . . . . . . . . . . .1017Configuration notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1021Aggregating routes advertised to BGP4 neighbors . . . . . . . .1024Configuring BGP4 graceful restart . . . . . . . . . . . . . . . . . . . . . . . . 1025Configuring BGP4 graceful restart . . . . . . . . . . . . . . . . . . . . 1025Configuring timers for BGP4 graceful restart (optional) . . . 1025BGP null0 routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1026Configuration steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1027Configuration examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1028Show commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1029Modifying redistribution parameters . . . . . . . . . . . . . . . . . . . . . . 1030Redistributing connected routes. . . . . . . . . . . . . . . . . . . . . . .1031Redistributing RIP routes. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1031Redistributing OSPF external routes. . . . . . . . . . . . . . . . . . . .1031Redistributing static routes . . . . . . . . . . . . . . . . . . . . . . . . . . 1032Disabling or re-enabling re-advertisement of all learnedBGP4 routes to all BGP4 neighbors . . . . . . . . . . . . . . . . . . . 1032Redistributing IBGP routes into RIP and OSPF. . . . . . . . . . . 1033Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1033Filtering specific IP addresses . . . . . . . . . . . . . . . . . . . . . . . 1033Filtering AS-paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1035Filtering communities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1038Defining IP prefix lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1041Defining neighbor distribute lists . . . . . . . . . . . . . . . . . . . . . 1042Defining route maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1042Using a table map to set the rag value. . . . . . . . . . . . . . . . . 1050Configuring cooperative BGP4 route filtering. . . . . . . . . . . . .1051
