C
HAPTER
45
| IP Routing Commands
Open Shortest Path First (OSPFv2)
– 1044 –
EXAMPLE
Console(config)#router ospf
Console(config-router)#
RELATED COMMANDS
network area (1059)
compatible rfc1583 This command calculates summary route costs using RFC 1583 (early
OSPFv2). Use the no form to calculate costs using RFC 2328 (OSPFv2).
SYNTAX
[no] compatible rfc1583
COMMAND MODE
Router Configuration
DEFAULT SETTING
RFC 1583 compatible
COMMAND USAGE
â—† When RFC 1583 compatibility is enabled, only cost is used when
choosing among multiple AS-external LSAs advertising the same
destination. When disabled, preference is based on type of path (where
type 1 external paths are preferred over type 2 external paths, using
cost only to break ties (RFC 2328).
â—† All routers in an OSPF routing domain should use the same RFC for
calculating summary routes.
â—† If there are any OSPF routers in an area exchanging summary
information (specifically, ABRs) which have not been upgraded to
OSPFv2, this command should be used on the newly upgraded OSPFv2
routers to ensure compatibility with routers still running older OSPFv2
code. Once all systems have been upgraded to newer OSPFv2 code, use
the no form of this command to restore compatibility for all systems
with RFC 2328.
EXAMPLE
Console(config-router)#compatible rfc1583
Console(config-router)#
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