When to move DLCI's off the Frame Relay main interface

Just kind of pondering this one, any scenarios that I may want to be alert for in terms of what interfaces have what dlci's? Let me explain a little:

 

I'm curious about the tasks that may require me to have only a certain DLCI on S0/0 (or whatever interface) in the output of sh frame pvc, whereby I would have to move the rest. Like say, create a subinterface or use a different serial interface and use frame interface-dlci to place them there. I faintly remember hearing about the possibility of having to do that.


 

Tasks that ask "Use only the DLCI's specified in the diagram" make me think, maybe I shouldn't only verify with the show frame-relay map command.

Comments


  • When they are asking "only use the Dlci specified" in that case we only have to use the dlci in our mapping meaning that  we have to use only the specified dlci to send and recieve data.


  • Sounds like it's open to interpretation though right? I mean, IE teaches us that, but will all the proctors think that way? oh wait... I just answered this question myself with a "ask the proctor" type scenario ha? Perhaps I'm just looking into things too much as 'go time' nears



    On Mon, Jan 26, 2009 at 8:19 PM, Bored <[email protected]> wrote:


    When they are asking "only use the Dlci specified" in that case we only have to use the dlci in our mapping meaning that  we have to use only the specified dlci to send and recieve data.






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  • Personal choice really...

    If you've turned off inverse arp and are statically mapping everything, then the additional dlci's aren't hurting you anyway.

    If you are using inverse arp, don't forget that you can turn it off for specific (unused) dlci's only.

    So you don't NEED to  move them someplace else unless you absolutely feel like it!  :)

    Scott






    ----- Original Message -----
    From: "luisgarcia" <[email protected]>
    Sent: Mon, January 26, 2009 11:29
    Subject: [CCIE R&S] When to move DLCI's off the Frame Relay main interface



    Just kind of pondering this one, any scenarios that I may want to be alert for in terms of what interfaces have what dlci's? Let me explain a little:

     

    I'm curious about the tasks that may require me to have only a certain DLCI on S0/0 (or whatever interface) in the output of sh frame pvc, whereby I would have to move the rest. Like say, create a subinterface or use a different serial interface and use frame interface-dlci to place them there. I faintly remember hearing about the possibility of having to do that.


     

    Tasks that ask "Use only the DLCI's specified in the diagram" make me think, maybe I shouldn't only verify with the show frame-relay map command.


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  • I can visualize a scenario that some proctor's evil twin brother might come up with:

    1. Use the physical interface for communications
    2. Do not use frame-relay map statements
    3. Do not disable inverse-arp for any dlci
    4. Permit dynamic mappings only for the specified dlcis
    5. (Backbone routers have ip addresses configured with dlcis that connect to your interfaces)

    Providing there is no prohibition against creating a subinterface, the easiest solution might be to create a multi-point subinterface and move the unused dlcis to the subinterface - as long as you don't configure an ip address on the subinterface, inverse-arp will not create dynamic mappings for these dlcis.

  • So which proctor is your non-evil twin?image

  • I'm sure Scott could come up with something more challenging!

  • You must think I'm particularly evil or something like that.   ;)






    ----- Original Message -----
    From: "DarrellEscola" <[email protected]>
    Sent: Tue, January 27, 2009 18:51
    Subject: Re: [CCIE R&S] When to move DLCI's off the Frame Relay main interface


    I'm sure Scott could come up with something more challenging!



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  • Scott,

    I just respect your abilities!

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