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Configuring IP Unicast Routing
Configuring Protocol-Independent Features
DETAILED STEPS
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.
To re-enable the sending of routing updates, use the no passive-interface interface-id router configuration command.
EXAMPLE
The following example sends EIGRP updates to all interfaces on network 10.108.0.0 except Ethernet interface 1:
router eigrp 109
network 10.108.0.0
passive-interface ethernet 1
The following example sets all interfaces as passive and then activates Ethernet interface 0:
router ospf 100
passive-interface default
no passive-interface ethernet0
network 10.108.0.1 0.0.0.255 area 0
Controlling Advertising and Processing in Routing Updates
You c an use the distribute-list router configuration command with access control lists to suppress routes from being
advertised in routing updates and to prevent other routers from learning one or more routes. When used in OSPF, this
feature applies to only external routes, and you cannot specify an interface name.
You c an also use a distribute-list router configuration command to avoid processing certain routes listed in incoming
updates. (This feature does not apply to OSPF.)
BEFORE YOU BEGIN
Configure an access list defining which networks are to be sent or received and which are to be suppressed in
routing updates.
Command Purpose
1. configure terminal Enter global configuration mode.
2. router {bgp | rip | ospf | eigrp} Enter router configuration mode.
3. passive-interface interface-id Suppress sending routing updates through the specified
Layer 3 interface.
4. passive-interface default (Optional) Set all interfaces as passive by default.
5. no passive-interface interface type (Optional) Activate only those interfaces that need to have
adjacencies sent.
6. network network-address (Optional) Specify the list of networks for the routing
process. The network-address is an IP address.
7. end Return to privileged EXEC mode.
8. copy running-config startup-config (Optional) Save your entries in the configuration file.
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