When you see the word dynamic in the output of show frame map

When you see the word dynamic in the output of show frame map, that particular mapping was performed by Inverse ARP. You don't just make the DLCI number up - the Frame provider will provide you with the DLCIs you should use.

It's highly recommended that you run either static or dynamic DLCI mappings - don't use them both on the same interface.

The DLCI (pronounced "del-see") is simply an identifier for the connection between the DTE and the closest DCE in the frame switch.

Call Termination - The call is torn down.

Idle -- The connection is active, but no data is going across the line. PVCs have two steps, data transfer and idle. Those of you who have read my previous books know that I'm all for the router and the switch using dynamic methods as often as possible, since dynamically learned information is the easiest information to keep current.

Data Transfer -- Again, just what it sounds like.

miniature relay

In today's CCNP certification tutorial, we'll concentrate on the BCRAN exam and Frame Relay PVCs, SVC, and DLCIs in particular. As with an ISDN call, if the call stays idle too long, the call will be torn down.

To allow IARP to perform dynamic mappings, just enable Frame Relay with “encapsulation frame-relay” and open the interface.

The key to a successful Frame configuration is remembering that the local DLCI must be mapped to a remote IP address. SVCs go through a basic four-step process, and it's a lot like ISDN:

Call Setup -- Just what it sounds like, the circuit between the two DTEs is created.

To earn your CCNA and CCNP, you have to know the details of frame relay! Learn all about PVCs, SVCs, DLCIs, and frame map statements from Chris Bryant, CCIE Single-Phase Relays Manufacturers12933.

. An SVC # doesn't have anything to do with an L2 switch - it's a VC that is built only under predefined circumstances, similar to an ISDN connection that is only built when interesting traffic hits the line. Unlike an SVC, when a PVC goes to idle, the PVC will not be torn down.

A PVC is just what the name says - it's permanent, and is already built when traffic needs to be sent. However, in this case, the static method of DLCI - IP address mapping is considered more reliable than the dynamic method, Inverse Address Resolution Protocol (IARP). There are two ways to do this, one being dynamic and the other involving a static configuration.

There are actually two kinds of virtual circuits - Permanent Virtual Circuits (PVCs) and Switched Virtual Circuits (SVCs). This can result in incomplete mappings if and when the router is reloaded