RE: PPP multilink over Frame relay

The only time it would be really important is if a question stated you
needed to ping your local interface. If that is the case you need the
multilink. Beyond that they effectively provide the same functionality.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com
Telephone: +1.810.326.1444, ext. 208
Live Assistance, Please visit: www.ipexpert.com/chat
eFax: +1.810.454.0130

IPexpert is a premier provider of Self-Study Workbooks, Video on Demand,
Audio Tools, Online Hardware Rental and Classroom Training for the Cisco
CCIE (R&S, Voice, Security & Service Provider) certification(s) with
training locations throughout the United States, Europe, South Asia and
Australia. Be sure to visit our online communities at
www.ipexpert.com/communities and our public website at www.ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Maarten Vervoorn
Sent: Wednesday, July 14, 2010 9:44 AM
To: Cisco certification
Subject: 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
===========================================================

Blogs and organic groups at http://www.ccie.net
Received on Wed Jul 14 2010 - 10:20:22 ART