PPP multilink over Frame relay

For PPP multilink over frame relay you can configure it two ways. With a
multilink interface or only on the virtual-template. Whats the difference
between them? Below are the two configurations'I'm talking about. The only
difference I can see is that the multilink interface is different (virtual
access and multilink 1) and the multilink haas one inactive interface
(virtual-temp1, is always down). When shall I choose a multilink interface
and when shall I choose to do the commands on the virtual-template?

==============With Multilink interface================
interface Serial1/0
 encapsulation frame-relay
 frame-relay traffic-shaping
 no frame-relay inverse-arp
!
interface Serial1/0.1 point-to-point
 snmp trap link-status
 frame-relay interface-dlci 102 ppp Virtual-Template1
!
interface Virtual-Template1
 no ip address
 ppp multilink
 ppp multilink group 1
!
interface Multilink1
 ip unnumbered Loopback1
 fair-queue 64 256 0
 ppp multilink
 ppp multilink interleave
 ppp multilink group 1
!

I can see the virtual-temp is inactive (its always down so its correct

R1#sh ppp mul
Multilink1
  Bundle name: R2
  Remote Endpoint Discriminator: [1] R2
  Local Endpoint Discriminator: [1] R1
  Bundle up for 00:00:21, total bandwidth 28, load 1/255
  Receive buffer limit 12000 bytes, frag timeout 3428 ms
  Interleaving enabled
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x2 received sequence, 0x3 sent sequence
  Member links: 1 active, 1 inactive (max not set, min not set)
    Vi1, since 00:00:21, 105 weight, 95 frag size
    Vt1 (inactive)
No inactive multilink interfaces

==============Only virtual-template interface================
!
interface Serial1/0
 encapsulation frame-relay
 frame-relay traffic-shaping
 no frame-relay inverse-arp
!
interface Serial1/0.1 point-to-point
 snmp trap link-status
 frame-relay interface-dlci 201 ppp Virtual-Template1
!
interface Virtual-Template1
 ip unnumbered Loopback1
 fair-queue
 ppp multilink
 ppp multilink interleave
!

R2#sh ppp mul
Virtual-Access4
  Bundle name: R1
  Remote Endpoint Discriminator: [1] R1
  Local Endpoint Discriminator: [1] R2
  Bundle up for 00:02:27, total bandwidth 28, load 1/255
  Receive buffer limit 12192 bytes, frag timeout 3483 ms
  Interleaving enabled
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x3 received sequence, 0x2 sent sequence
  Member links: 1 (max not set, min not set)
    Vi1, since 00:02:27, 105 weight, 95 frag size
No inactive multilink interfaces
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Received on Wed Jul 14 2010 - 15:43:44 ART