Multicast and Routing Guide K/KA/KB.15.15

Enabling route redistribution
This step enables ASBR operation on a routing switch, and must be executed on each routing
switch connected to external routes you want to redistribute in your OSPF domain.
The basic form of the redistribute command redistributes all routes of the selected type. For
finer control over route selection and modification of route properties, you can specify the
route-map parameter and the name of a route map. (For general information on route policy
and route maps, see “Route Policy” (page 205). For examples of using route maps in route
redistribution, see “Using route policy in route redistribution” (page 214).)
NOTE: Do not enable redistribution until you have configured the redistribution "restrict" filters.
Otherwise, the network might become overloaded with routes that you did not intend to redistribute.
Syntax:
[no] router ospf redistribute [ connected | static | rip ]
route-mapname
Executed on an ASBR to globally enable redistribution of the specified route type
to the OSPF domain through the area in which the ASBR resides.
static Redistribute from manually configured routes.
connected Redistribute from locally connected networks.
rip Redistribute from RIP routes.
route-map name Optionally specify the name of a route-map to apply during
redistribution.
The no form of the command disables redistribution for the specified route type.
Example
To enable redistribution of all supported external route types through a given ASBR,
execute the following commands.
HP Switch(config)# router ospf redistribution connected
HP Switch(config)# router ospf redistribution static
HP Switch(config)# router ospf redistribution rip
Modifying the default metric for redistribution
Optional: The default metric is a global parameter that specifies the cost applied to all OSPF routes
by default.
Syntax:
router ospf default-metric 0-16777215
Globally assigns the cost metric to apply to all external routes redistributed by the
ASBR. By using different cost metrics for different ASBRs, you can prioritize the
ASBRs in your AS.
Default: 10
Example:
To assign a default metric of 4 to all routes imported into OSPF on an ASBR, enter
the following commands:
HP Switch()#
HP Switch(config)# router ospf default-metric 4
Configuring external route redistribution in an OSPF domain (optional) 149