PPP Mulilink problem

[FRasuli01]

Need Help!

Got problem with ppp multilink. Set up it, but the interface show down, like that in both side:

Serial4:0                  unassigned      YES manual down                  down
Serial5:0                  unassigned      YES manual down                  down

check lthe phisical line, phisical line is ok.

here are configs of both sides

R1:

controller E1 0/0/0
 framing NO-CRC4
 clock source internal
 channel-group 0 timeslots 1-31

!
controller E1 0/0/1
 framing NO-CRC4
 clock source internal
 channel-group 0 timeslots 1-31
 
!
 

interface Multilink3
 ip address 192.10.10.1 255.255.255.252
 ppp multilink
 ppp multilink interleave
 ppp multilink group 3

interface Serial0/0/0:0
 no ip address
  encapsulation ppp
 ppp multilink
 ppp multilink group 3
!
interface Serial0/0/1:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 3
!

R2:

controller E1 4
 framing NO-CRC4
 clock source line secondary 4
 channel-group 0 timeslots 1-31
 !
controller E1 5
 framing NO-CRC4
 clock source line secondary 5
 channel-group 0 timeslots 1-31
 

interface Multilink3
 ip address 172.28.235.37 255.255.255.252
 shutdown
 ppp multilink
 ppp multilink interleave
 ppp multilink group 3

interface Serial4:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 3
!
interface Serial5:0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 3

What to do?

[James Neilson · Accepted solution]

I would assume the multilink interface on R2 been shut down is the issue

interface Multilink3
 ip address 172.28.235.37 255.255.255.252
 shutdown <------------------- do a no shut on this interface
 ppp multilink
 ppp multilink interleave
 ppp multilink group 3