[c-nsp] PPP Multilink failed on multihop

[Jefri Abdullah]

I've two router (7609 and 7606) running on two different site, this
site connected using 2 E1 link. I tried to bundled this link as 1 PPP
Multilink, but the router failed to forward packet if destination has
more than 1 hop.

edge01-jkt#sh ppp multilink

Multilink1, bundle name is edge02-mdn
  Bundle up for 00:19:32
  0 lost fragments, 23 reordered, 0 unassigned
  0 discarded, 0 lost received, 1/255 load
  0xAA6 received sequence, 0x2CD sent sequence
  Member links: 2 active, 0 inactive (max not set, min not set)
    Se4/1/2, since 00:27:01, last rcvd seq 000AA4
    Se4/1/3, since 00:27:01, last rcvd seq 000AA5

Tried to ping remote multilink interface and it was successed

edge01-jkt#ping a.b.c.39

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to a.b.c.39, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms

Then failed, when i try to trace from edge02-mdn (7606 series) to
remote site that has more than 2 hop

edge02-mdn>traceroute 152.118.24.1

Type escape sequence to abort.
Tracing the route to 152.118.24.1

  1 a.b.c.38 4 msec 8 msec 4 msec
  2  *  *  *
  3  *  *  *
  4  *  *  *
  5  *  *  *
...

This is my configuration

interface Serial4/1/2
 bandwidth 2048
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface Serial4/1/3
 bandwidth 2048
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface Multilink1
 ip address a.b.c.38 255.255.255.254
 ppp multilink
 no ppp multilink fragmentation
 multilink-group 1
end


7609 (sup 720) IOS: IOS (tm) s72033_rp Software
(s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(18)SXF5, RELEASE
SOFTWARE (fc3)

7606 (sup 720) IOS (tm) s72033_rp Software
(s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(18)SXF5, RELEASE
SOFTWARE (fc3)

Whats wrong with my configuration?

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NULL