When configuring a Frame Relay switch layer 1 DCE/DTE is independent of layer 2 DCE/DTE. The “clock rate” command can only be applied on the layer 1 DCE side of the cable. This can be determined by looking at the cable for a DTE/DCE labeling, using the “show controllers serial X/X” command or by just issuing the “clock rate” command on both sides. The side that accepts the command is the layer 1 DCE.

In regards to Frame Relay layer 2 DCE is independent of the layer 1 DCE. Commonly the layer 1 DCE end of the cable is connected to the FRS and the layer 2 DCE is also configured on the FRS side. The configuration of the Frame Relay DCE can be done by using the “frame-relay intf-type dce” command. By default Frame Relay interfaces are DTE. Also as a point of interest the Frame Relay DCE side is the side that commonly generates LMI. I used the word commonly because although unusual you can have a Frame Relay connection without LMI.

About Brian Dennis, CCIE #2210:

Brian Dennis has been in the networking industry for more than 22 years, with a focus on Cisco networking for the past 16 years. Brian achieved his first CCIE in Routing & Switching in 1996, and is currently the only ten year CCIE that holds five CCIE certifications. Prior to working with INE, Brian taught and developed CCIE preparation courses for various well known training organizations. Brian not only brings his years of teaching experience to the classroom, but also years of real world enterprise and service provider experience.

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