MLP Interleaving Disabled - with interface multilink and virtual-template

I'm having difficulties getting the interleaving activated on my multilink.  I first tried using a virtual template:

multilink virtual-template 1

interface serial0/1
 no ip address  
 ppp multilink
 

interface Virtual-Template1
 bandwidth 128
 ip address 155.1.45.4 255.255.255.0
 ip rip advertise 10
 ppp multilink
 ppp multilink fragment delay 10
 ppp multilink interleave

Virtual-Access2, bundle name is Rack1R5
  Endpoint discriminator is Rack1R5
  Bundle up for 00:00:45, total bandwidth 128, load 1/255
  Receive buffer limit 12192 bytes, frag timeout 1000 ms
  Interleaving disabled
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x33 received sequence, 0x32 sent sequence
  Member links: 1 (max not set, min not set)
    Se0/1, since 00:00:45, 160 weight, 152 frag size

After a lot of troubleshooting I decided to just use a multilink interface:

interface Multilink1
 ip address 155.1.45.4 255.255.255.0
 ip rip advertise 10
 ppp multilink
 ppp multilink fragment delay 10
 ppp multilink interleave
 ppp multilink group 1

!
interface Serial0/1
 bandwidth 128
 no ip address
 encapsulation ppp
 fair-queue
 ppp multilink
 ppp multilink group 1

Multilink1, bundle name is Rack1R5
  Endpoint discriminator is Rack1R5
  Bundle up for 00:23:13, total bandwidth 128, load 243/255
  Receive buffer limit 12000 bytes, frag timeout 1000 ms
  Interleaving disabled
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0xAEF7 received sequence, 0x15EAB sent sequence
  Member links: 1 active, 0 inactive (max not set, min not set)
    Se0/1, since 00:23:13, 160 weight, 152 frag size
No inactive multilink interfaces

 That's when I thought maybe it was diabled because I wasn't pushing any traffic through it.  So I set up a push through that pipe using SLA.   The interleaving never became enabled.

Any ideas?

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