Cisco Systems 3750E manual Filtering Routing Information, Setting Passive Interfaces, 38-87

Chapter 38 Configuring IP Unicast Routing

Configuring Protocol-Independent Features

	Command	Purpose
Step 11
	end	Return to privileged EXEC mode.
Step 12
	show route-map [map-name]	(Optional) Display all route maps configured or only the one
		specified to verify configuration.
Step 13
	show ip policy	(Optional) Display policy route maps attached to interfaces.
Step 14
	show ip local policy	(Optional) Display whether or not local policy routing is
		enabled and, if so, the route map being used.
Step 15
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Use the no route-mapmap-tagglobal configuration command or the no match or no set route-map configuration commands to delete an entry. Use the no ip policy route-mapmap-taginterface configuration command to disable PBR on an interface. Use the no ip route-cache policy interface configuration command to disable fast-switching PBR. Use the no ip local policy route-mapmap-tagglobal configuration command to disable policy-based routing on packets originating on the switch.

Filtering Routing Information

You can filter routing protocol information by performing the tasks described in this section.

Note When routes are redistributed between OSPF processes, no OSPF metrics are preserved.

Setting Passive Interfaces

To prevent other routers on a local network from dynamically learning about routes, you can use the passive-interfacerouter 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.

Beginning in privileged EXEC mode, follow these steps to configure passive interfaces:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	router {bgp rip ospf eigrp}	Enter router configuration mode.
Step 3
	passive-interface interface-id	Suppress sending routing updates through the specified Layer 3
		interface.
Step 4
	passive-interface default	(Optional) Set all interfaces as passive by default.
Step 5
	no passive-interface interface type	(Optional) Activate only those interfaces that need to have
		adjacencies sent.
Step 6
	network network-address	(Optional) Specify the list of networks for the routing process. The
		network-addressis an IP address.
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02			38-87