PPP Multilink

username R2 password 0 cisco

! Configure a user account with the hostname of the peer and a matching password

! 

interface Multilink1

 ip address 1.1.1.1 255.255.255.252

 ppp multilink

 ppp multilink group 1

!

interface Serial0/1

 no ip address

 encapsulation ppp

 clock rate 2000000

 ppp authentication chap

 ppp multilink

 ppp multilink group 1

!

interface Serial0/2

 no ip address

 encapsulation ppp

 clock rate 2000000

 ppp authentication chap

 ppp multilink

 ppp multilink group 1

=====================

username R1 password 0 cisco

!

interface Multilink1

 ip address 1.1.1.2 255.255.255.252

 ppp multilink

 ppp multilink group 1

!

interface Serial0/1

 no ip address

 encapsulation ppp

 clock rate 2000000

 ppp authentication chap

 ppp multilink

 ppp multilink group 1

!

interface Serial0/2

 no ip address

 encapsulation ppp

 clock rate 2000000

 ppp authentication chap

 ppp multilink

 ppp multilink group 1

=====================

R1#show ppp multilink

Multilink1, bundle name is R2

  Username is R2

  Endpoint discriminator is R2

  Bundle up for 00:01:29, total bandwidth 4632, load 1/255

  Receive buffer limit 36000 bytes, frag timeout 1000 ms

    0/0 fragments/bytes in reassembly list

    0 lost fragments, 0 reordered

    0/0 discarded fragments/bytes, 0 lost received

    0x4 received sequence, 0x9 sent sequence

  Member links: 2 active, 0 inactive (max not set, min not set)

    Se0/1, since 00:01:29

    Se0/2, since 00:01:29

No inactive multilink interfaces

R2#show interface multilink1
Multilink1 is up, line protocol is up
  Hardware is multilink group interface
  Internet address is 1.1.1.2/30
  MTU 1500 bytes, BW 3088 Kbit/sec, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Open, multilink Open
  Open: IPCP, CDPCP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 2 seconds on reset
  Last input 00:00:52, output never, output hang never
  Last clearing of "show interface" counters 00:36:36
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     1071 packets input, 117686 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     1078 packets output, 132324 bytes, 0 underruns
     0 output errors, 0 collisions, 5 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out

#debug ppp authentication