Multilink with Multiple Interfaces

From: Cal Michael (cmichael@network-data.com)
Date: Fri Dec 12 2003 - 15:33:08 GMT-3


- All,

  I have came across the following problem,
  er feature with a favorite PPP feature,
  multilink.

  The virtual-template interface would
  not go into an up/up state which appeared
  to prevent frame-relay from being usable
  until a shut/noshut was performed on the
  ISDN interface which had become activated
  (successfully) after a full device reload.

  The lab configuartion was:

  <<<Main Frame Relay Configuration>>>

  ip cef

  multilink virtual-template 1

  policy-map FRTS-SHAPING
    class MEDIA
     priority 96

  interface Serial0/0
   bandwidth 256
   no ip address
   encapsulation frame-relay
   frame-relay traffic-shaping
   frame-relay lmi-type ansi

  interface Serial0/0.121 point-to-point
   frame-relay interface-dlci 121 ppp Virtual-Template1
    class Voice-EPVC

  interface Serial0/0.131 point-to-point
   frame-relay interface-dlci 131 ppp Virtual-Template1
    class Voice-EPVC

  map-class frame-relay Voice-EPVC
   frame-relay cir 128000
   frame-relay bc 1280
   frame-relay be 0
   frame-relay mincir 128000
   service-policy output FRTS-SHAPING
   frame-relay fragment 160

  interface Virtual-Template1
   bandwidth 128
   ip address 192.168.10.2 255.255.255.252
   ip tcp header-compression iphc-format
   load-interval 30
   max-reserved-bandwidth 85
   service-policy output FRTS-SHAPING
   ppp multilink
   ppp multilink fragment-delay 10
   ppp multilink interleave
   ip rtp header-compression iphc-format

  <<<ISDN Configuration>>>

  username changeme password changeme

  interface BRI1/0
   no ip address
   encapsulation ppp
   dialer pool-member 10
   isdn switch-type basic-ni
   isdn spid1 80055512120101 5551212
   isdn spid2 80055512120102 5551212
   no cdp enable
   ppp authentication chap
   ppp multilink

  interface Dialer1
   ip address 192.168.254.2 255.255.255.252
   encapsulation ppp
   dialer pool 10
   dialer remote-name changeme
   dialer idle-timeout 900
   dialer string 8005554567
   dialer load-threshold 80 outbound
   dialer-group 1
   ppp authentication chap
   ppp multilink

  I suspect that the ISDN interface is
  attempting to utilize / bind to the
  virtual-template interface for some
  reason; but I would think that this
  would again occur when the ISDN
  interface was brought up again, which
  it doesn't.

  Is the use of multilink groups an
  appropriate solution to this, and if
  so, how should it be applied to the
  configuration? Or is there another
  way?

--- Thanks ---



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