Filtering Routing Information - Cisco Catalyst 9500 series Configuration Manual

Configuring IP Unicast Routing
Step 12
Step 13
Step 14
Step 15

Filtering Routing Information

You can filter routing protocol information by performing the tasks described in this section.
When routes are redistributed between OSPF processes, no OSPF metrics are preserved.
Note
Setting Passive Interfaces
To prevent other routers on a local network from dynamically learning about routes, you can use the
passive-interface router configuration command to keep routing update messages from being sent through
a router interface. When you use this command in the OSPF protocol, the interface address you specify as
passive appears as a stub network in the OSPF domain. OSPF routing information is neither sent nor received
through the specified router interface.
In networks with many interfaces, to avoid having to manually set them as passive, you can set all interfaces
to be passive by default by using the passive-interface default router configuration command and manually
setting interfaces where adjacencies are desired.
Use a network monitoring privileged EXEC command such as show ip ospf interface to verify the interfaces
that you enabled as passive, or use the show ip interface privileged EXEC command to verify the interfaces
that you enabled as active.
Command or Action
end
Example:
Device(config)# end
show route-map [map-name]
Example:
Device# show route-map
show ip policy
Example:
Device# show ip policy
show ip local policy
Example:
Device# show ip local policy
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
Filtering Routing Information
Purpose
Returns to privileged EXEC mode.
(Optional) Displays all the route maps configured or only
the one specified to verify configuration.
(Optional) Displays policy route maps attached to the
interface.
(Optional) Displays whether or not local policy routing
is enabled and, if so, the route map being used.
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