Multilink interfaces with the same IP address

From: Modular (modulartx@gmail.com)
Date: Sun Mar 08 2009 - 05:18:10 ARST


While working some practice labs Ive run into some scenarios where the
proctor guides provide solutions where two MFR interfaces or two regular
multilink interfaces are set up on a router with the same IP address. How is
this possible??

R6

interface MFR1

 no ip address

 no keepalive

!

interface MFR1.69 point-to-point

 ip address 150.100.69.6 255.255.255.0

 frame-relay interface-dlci 690

!

interface MFR1.96 point-to-point

 ip address 150.100.96.6 255.255.255.0

 frame-relay interface-dlci 960

!

interface Serial0/2/0

 no ip address

 encapsulation frame-relay MFR1

 clock rate 2000000

 no arp frame-relay

!

interface Serial0/2/1

 no ip address

 encapsulation frame-relay MFR1

 clock rate 2000000

 no arp frame-relay

R9

interface MFR1

 no ip address

 no keepalive

!

interface MFR1.69 point-to-point

 ip address 150.100.69.9 255.255.255.0

 frame-relay interface-dlci 690

!

interface MFR1.96 point-to-point

 ip address 150.100.96.9 255.255.255.0

 frame-relay interface-dlci 960

!

interface Serial0/2/0

 no ip address

 encapsulation frame-relay MFR1

 no arp frame-relay

!

interface Serial0/2/1

 no ip address

 encapsulation frame-relay MFR1

 no arp frame-relay

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