824
Configuring IP Unicast Routing
Configuring OSPF
Routes learned through any IP routing protocol can be redistributed into another IP routing protocol. At the
intradomain level, this means that OSPF can import routes learned through EIGRP and RIP. OSPF routes can also be
exported into RIP.
Plain text and MD5 authentication among neighboring routers within an area is supported.
Configurable routing interface parameters include interface output cost, retransmission interval, interface transmit
delay, router priority, router dead and hello intervals, and authentication key.
Virtual links are supported.
Not-so-stubby-areas (NSSAs) per RFC 1587 are supported.
OSPF typically requires coordination among many internal routers, area border routers (ABRs) connected to multiple
areas, and autonomous system boundary routers (ASBRs). The minimum configuration would use all default parameter
values, no authentication, and interfaces assigned to areas. If you customize your environment, you must ensure
coordinated configuration of all routers.
This section includes the following topics:
Default OSPF Configuration, page 825
Nonstop Forwarding Awareness, page 826
Configuring OSPF Interfaces, page 827
Configuring OSPF Network Types, page 829
Configuring OSPF Area Parameters, page 832
Configuring Other OSPF Parameters, page 834
Changing LSA Group Pacing, page 836
Configuring a Loopback Interface, page 836
Monitoring OSPF, page 837