PPP Multilink

R1(config)#int s1/0
R1(config-if)#encapsulation ppp
R1(config-if)#ppp multilink group 1
R1(config-if)#no shut

R1(config-if)#do sh run int s1/0
Building configuration...
Current configuration : 108 bytes!

interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink group 1
end

R1(config-if)#int s1/1
R1(config-if)#encapsulation ppp
R1(config-if)#ppp multilink group 1
R1(config-if)#no shut

R1(config-if)#do sh run int s1/1
Building configuration...
Current configuration : 118 bytes!

interface Serial1/1
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink group 1
end

R1(config-if)#int multilink 1

After created the multilink interface, some commands are automatically added in serial interfaces and multilink interface

R1(config-if)#do sh run int s1/0
Building configuration...
Current configuration : 123 bytes!

interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
end

R1(config-if)#do sh run int s1/1
Building configuration...
Current configuration : 123 bytes!

interface Serial1/1
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
end

R1(config-if)#do sh run int mul1
Building configuration...
Current configuration : 81 bytes!

interface Multilink1
no ip address
ppp multilink
ppp multilink group 1
end