CCIE Pursuit Blog

March 1, 2008

Using ‘frame-relay interface-dlci x protocol ip’ To Create Frame Maps

I stumbled across this post about another method to create Frame Relay mappings:

Guys,I’m just going through the [IPexpert] audio bootcamp for Frame-Relay and I’ve come across something I’m not sure of.In the lecure Scott talks about using the “frame-relay interface-dlci protocol ip” command instead of the “frame-relay map” command. I’ve never personally configured this so decided to check it out on the doc cd and found the following under the command reference :-

protocol ip ip-address
(Optional) Indicates the IP address of the main interface of a new router or access server onto which a router configuration file is to be automatically installed over a Frame Relay network. Use this option only when this device will act as the BOOTP server for automatic installation over Frame Relay.

Has anybody actually used this command before? I would try myself but my racks elsewhere at the moment. I’m sure Scott is correct and that Cisco are merely making a recommendation and that it’s not to be used in every day practice for replacing the frame map command.p.s. Couldn’t find any reference to the command in the config guide on the doc cd?

This command is used for auto-install over Frame Relay.  Further down the postings a user showed a successful Frame mapping using this command.  The one caveat is that it only works on point-to-point subinterfaces.

***Updated 02 March***

See comments about the configuration example in the Sadikhov forum.

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3 Comments »

  1. Hi there,

    I am a bit confused with that one: on frame relay point to point subinterface, we don’t need any static mapping, do we? In the exemple on the sadikhov forum, everything would work the same way without the mapping commands on the spoke?

    Cheers,
    Mathew

    Comment by Mathew — March 2, 2008 @ 7:12 am | Reply

  2. @Mathew – I agree. On a point-to-point subinterface you simply need to assign a DLCI – no mapping to a remote IP address is needed. The configuration in the forum would work if “frame interface-dlci x” were used without the additional “protocol ip x.x.x.x” statement.

    I have not heard the audio quoted in the posting. This command is used on the BootP server and it seems to me that one might use this in a scenario where you are not allowed to configure the IP address/frame map of a neighbor router. I’ll try to research this further.

    The only reference I was able to find with a quick Google search was on page 316 of a Google book search of Gary Donahue’s Network Warrior (an excellent book that I wish I had the time to finish). I’ll post the really long URL below. It appears that he just uses the command as a way to document the far side IP address?

    http://books.google.com/books?id=-g7OA6lIJmMC&pg=PA316&lpg=PA316&dq=%22frame+relay%22+%22interface+dlci%22+protocol+ip&source=web&ots=yKE8ChhAAm&sig=L6xt6bAzCE5sG4NrwgcY9wwJQN0&hl=en#PPA316,M1

    Anyhoo…you are correct about the example in the forum posting. Thank you for checking out that scenario and for the comment.

    Comment by cciepursuit — March 2, 2008 @ 7:49 am | Reply

  3. This command is used for autoconfiguration of remote router on point-to-point links. There is also available similar configuration for multipoint links.

    Comment by Sebastian — March 2, 2008 @ 10:31 am | Reply


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