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In this article we will create a Frame Relay in GNS3 to learn how to configure Frame-Relay. Note: If you need to revise your Frame Relay knowledge, we recommend you to read our Frame Relay tutorial first. To configure Frame-Relay on R0, R2 and R3 we need to enable Frame-Relay encapsulation and specify a type of LMI (ansi – in this case).
Note: Data link connection identifiers (DLCIs) are numbers that refer to paths through the Frame Relay network. By default, Cisco uses Inverse ARP to map remote IP address of the PVC with the DLCI of the local interface as we can see here. The show frame-relay pvc command is used to display the status of all configured connections, traffic statistics, BECN and FECN packets received by the router. Switch 1 knows that the network is congesting so it also sends frames back to Router A with BECN bit set to 1 to inform that path through the network is congested. In general, BECN is used on frames traveling away from the congested area to warn source devices that congestion has occurred on that path while FECN is used to alert receiving devices if the frame experiences congestion. BECN also informs the transmitting devices to slow down the traffic a bit until the network returns to normal state. The question asks “which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion” which means it asks about the returned parameter which indicates congestion -> BECN. Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch.

Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.
Inverse ARP is a technique by which dynamic mappings are constructed in a network, allowing a device such as a router to locate the logical network address and associate it with a permanent virtual circuit (PVC). Local Management Interface (LMI) is a signaling standard protocol used between your router (DTE) and the first Frame Relay switch.
The show frame map command will show the frame-relay encap ONLY on the main interface when the main interface is configured.
What will happen if a private IP address is assigned to a public interface connected to an ISP? Hello friends.I am going to face CCNA exam within2 week ,i will be thankful if u give me info about latest ccna questions and lab. Notice that R1 will be Frame-Relay switch in this lab so its interfaces don’t need IP addresses. Notice that Inverse ARP is enabled by default on Cisco routers so we don’t need to type anything to activate it.
In practical, the Frame-Relay switch (R1) is placed at the ISP side so its interfaces should be set to DCE.
This value is displayed in three ways: its decimal value (177), its hexadecimal value (0xB1), and its value as it would appear on the wire (0x2C10). DLCI values are used on Frame Relay interfaces to distinguish between different virtual circuits.

If the network is congested, Switch 1 (a DCE device) will set the FECN bit value of that frame to 1, indicating that frame experienced congestion in the path from source to destination.
Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network. From the output we learn this interface is sending and receiving LMI messages -> Frame Relay is being used. When the “broadcast” keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts.
The show frame map command when used on a subinterface for say point-to-point will NOT show the encap type. DLCIs have local significance because the identifier references the point between the local router and the local Frame Relay switch to which the DLCI is connected. So, if you’re using subinterfaces, the encap will default to CISCO unless otherwise configured.

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