You can reduce the overhead due to OSPF LSA flooding by applying the interface-level command ip ospf flood-reduction:
Router9#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router9(config)#interface Serial0/0
Router9(config-if)#ip address 192.168.10.9 255.255.255.0
Router9(config-if)#ip ospf flood-reduction
Router9(config-if)#exit
Router9(config)#end
Router9#
By default, OSPF will flood the area with all known LSAs every 3,600 seconds (1 hour). This is done as a sort [...]

In this example, Router4 will dial into Router1 by using an ISDN circuit:
Router4#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router4(config)#username Router1 password 0 cisco
Router4(config)#interface BRI0
Router4(config-if)#ip address 192.168.15.4 255.255.255.0
Router4(config-if)#encapsulation ppp
Router4(config-if)#ip ospf demand-circuit
Router4(config-if)#dialer map ip 192.168.15.1 broadcast 4165550000
Router4(config-if)#dialer-group 1
Router4(config-if)#isdn switch-type basic-ni
Router4(config-if)#isdn spid1 416555001000 4165550010
Router4(config-if)#isdn spid2 416555001100 4165550011
Router4(config-if)#ppp authentication chap
Router4(config-if)#ppp multilink
Router4(config-if)#exit
Router4(config)#dialer-list 1 protocol ip permit
Router4(config)#router [...]

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The CCIE Security certification program provides a person with specialization in routing, voice, switching, and security. Since these exams are very rigorous, there are solely a limited quantity of people who cross and get certified.
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The first line in this configuration example defines the OSPF process:
Router5(config)#router ospf 87
The OSPF process number (87) doesn't propagate outside of the router. So you can use a different value for every router in an AS. Note that this is different from EIGRP, where every router in the AS must have the same process number. [...]

You can filter the routes that EIGRP receives on a particular interface (or subinterface) using the distribute-list in command as follows:
Router2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#access-list 34 deny 192.168.30.0
Router2(config)#access-list 34 permit any
Router2(config)#router eigrp 55
Router2(config-router)#distribute-list 34 in Serial0.1
Router2(config-router)#exit
Router2(config)#end
Router2#
EIGRP also provides a distribute-list out command that allows you to filter the routes [...]

You can disable the sending of RIP updates on all interfaces with the passive-interface default command:
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#router rip
Router1(config-router)#passive-interface default
Router1(config-router)#no passive-interface FastEthernet0/0.1
Router1(config-router)#network 172.22.0.0
Router1(config-router)#network 172.25.0.0
Router1(config-router)#network 192.168.1.0
Router1(config-router)#exit
Router1(config)#end
Router1#
The RIP network command has two functions. The first function tells RIP which routing prefixes to distribute. The second turns on RIP updates [...]

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