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Frame Relay Back to Back - Same DLCIs?

Discussion in 'Routing & Switching' started by kerrymaid, Jun 11, 2009.

  1. kerrymaid

    kerrymaid New Member

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    Hi,

    I know the below FR config is correct for a babk to back FR topology. The problem is that I don't under stand why the DLCIs HAVE to be the same at either end (particularly give that DLCIs are locally significant). Can someone please help?
    Many thanks.

    R1:
    interface Serial0/0/1
    encapsulation frame-relay
    frame-relay map ip 192.168.0.5 102
    frame-relay map ip 192.168.0.6 102 broadcast

    R3:
    frame-relay switching
    interface Serial0/0/0
    encapsulation frame-relay
    clockrate 64000
    frame-relay map ip 192.168.0.6 102
    frame-relay map ip 192.168.0.5 102 broadcast
    frame-relay intf-type dce
     
  2. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    45
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    You are correct, dlci's are only locally significant - but in the case of a back to back FR configuration there is no frame switch in between the routers, so they must agree on the dlci that will be used.

    Spice Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE

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