Segue abaixo uma situação na qual passei recentemente,:
R4 e R5 estão conectados via serial cable. Em ambos lados eu irei criar uma interface Lo para que eu possa colocar as configurações IPs, (não posso utilizar IPs nas seriais pois isso implicaria nas range interna do cliente, forma de economizar distribuição de IP ) . A os IPs usados para endereçar as Lo: será a 192.168.45.4/24 no roteador R4, e 192.168.45.5/24 no roteador R5.
IP Unnumbered
R4:interface lo0
ip add 192.168.45.4 255.255.255.0
!
interface Serial1/1
ip unnumbered Loopback0
encapsulation ppp
clock rate 64000
R5:interface lo0 ip add 192.168.45.5 255.255.255.0 ! interface Serial 1/1
ip unnumbered Loopback0
encapsulation ppp
==== ==== R4#sh ip route Gateway of last resort is not set
192.168.45.0/24is variably subnetted, 2 subnets, 2 masks C
192.168.45.5/32is directly connected, Serial0/0 C
192.168.45.0/24is directly connected, Loopback0
=-=-=-=-=-=-=-=-=-=-R5#sh ip route Gateway of last resort is not set
192.168.45.0/24is variably subnetted, 2 subnets, 2 masks C
192.168.45.4/32is directly connected, Serial0/0 C
192.168.45.0/24is directly connected, Loopback0
==== ====
R4#ping 192.168.45.5 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.45.5, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 12/22/36 ms R4#
==== ====
R5#ping 192.168.45.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.45.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/17/40 ms R5#
Para outras formas de se fazer essa configuração a fonte de pesquisa encontrada foi:
http://ardenpackeer.com/ios-features-management/troubleshooting-ip-addressing-tricks-tips-using-ppp/
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Josinfo Networks - To be CCIE R&S
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