Have I figured Frame Relay out yet?

jscimeca715jscimeca715 Posts: 280Member
Let me see if this is correct, as I've been working my @$$ off to get this stuff through my head.

If you have a multipoint connection to a router, by either using the physical interface or multipoint subinterface, you have to use the frame-relay interface-dlci command to tell the router which dlci's can be inverse arped to that IP address.

If you have a point-to-point physical or subinterface, you need the frame-relay interface-dlci command because InverseARP is not available.

Bueller? Bueller? Bueller?

Am I right? Or Am I on the right track?

Comments

  • jscimeca715jscimeca715 Posts: 280Member
    Okay, I think I might be narrowing it down. You don't need to specify on physical interfaces because LMI will deliver the PVC's to the physical interface. However, on point-to-point you will need to use frame-relay interface-dlci command and on multi-point you can use either frame-relay interface-dlci (if Inverse ARP is enabled) or frame-relay map ip next-hop ip dlci broadcast (if Inverse ARP is disabled).

    Closer?
  • NeekoNeeko Posts: 170Member
    Okay, I think I might be narrowing it down. You don't need to specify on physical interfaces because LMI will deliver the PVC's to the physical interface. However, on point-to-point you will need to use frame-relay interface-dlci command and on multi-point you can use either frame-relay interface-dlci (if Inverse ARP is enabled) or frame-relay map ip next-hop ip dlci broadcast (if Inverse ARP is disabled).

    Closer?

    Yes, this sounds correct.

    All subinterfaces will require the frame-relay interface-dlci command because there is no other way for the router to know which DLCIs apply to each subinterface.

    A physicall interface does not need this because LMI messages contains this information, and since subinterfaces cannot be configured if the physical interface is in use, the frame-relay interface-dlci command is not required.
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