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MultiLink interface on 7200 running C7200-IS-M

I have a cisco 7200 on one side of a multilink connection with multiple atm interfaces.  On the other side....I have a non Cisco device.

When I initiate an extended ping and specify the packet size for greater than 1523 Cisco fails and I get ......

When I do the exact same thing on the other side of the circuit(on an Adtran) I can successfully ping across the circuit. 

And if I go back to the Cisco and choose any smaller size packet it pings successfully.

???

interface Multilink14
  bandwidth 3072 ip unnumbered Loopback0
max-reserved-bandwidth 100
service-policy output DI-CE-101
load-interval 30
snmp ifindex persist
no cdp enable
ppp multilink
multilink-group 14


interface Virtual-Template14
  no ip address
max-reserved-bandwidth 100
service-policy output DI-CE-103
ppp multilink
multilink-group 14

interface ATM2/0.3221 point-to-point
  bandwidth 1536
ip unnumbered Loopback0
ip nat outside
no ip mroute-cache
atm pvc 3221 3 221 aal5ciscoppp 1536 1536 1536 Virtual-Template14
!
interface ATM2/0.3222 point-to-point
bandwidth 1536
ip unnumbered Loopback0
ip nat outside
no ip mroute-cache
atm pvc 3222 3 222 aal5ciscoppp 1536 1536 1536 Virtual-Template14

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