What is LMI type in Frame Relay?
Local Management Interface (LMI), a technology developed by Cisco, is a signaling standard that is used between the routers and frame relay switches for various purposes such as exchanging information keepalives timers, global addressing, multicasting and the current status of virtual circuits.
What is Frame Relay PVC?
Frame relay is a packet-switching telecommunications service designed for cost-efficient data transmission for intermittent traffic between local area networks (LANs) and between endpoints in wide area networks (WANs). For most services, the network provides a permanent virtual circuit (PVC).
What are the LMI extensions or the features for managing complex internetwork?
It offers a number of features (called extensions) for managing complex internetworks. Key Frame Relay LMI extensions include global addressing, virtual-circuit status messages, and multicasting.
What is DLCI in Frame Relay?
A data link connection identifier (DLCI) is a Frame Relay 10-bit-wide link-local virtual circuit identifier used to assign frames to a specific PVC or SVC. Frame Relay networks use DLCIs to statistically multiplex frames. DLCIs are preloaded into each switch and act as road signs to the traveling frames.
What is the default LMI type?
Today’s most popular option is to use the default LMI setting. This setting uses the LMI autosense feature, in which the router simply figures out which LMI type the switch is using….
| Name | Document | IOS LMI-Type Parameter |
|---|---|---|
| ITU | Q.933 Annex A | q933a |
What are the bandwidth specifications of frame relay?
Frame Relay complements and provides a mid-range service between basic rate ISDN, which offers bandwidth at 128 kbit/s, and Asynchronous Transfer Mode (ATM), which operates in somewhat similar fashion to Frame Relay but at speeds from 155.520 Mbit/s to 622.080 Mbit/s. Frame Relay has its technical base in the older X.
How do you check a frame relay?
1. Use the show interfaces serial command to check the state of the interface. 2. If the output shows that the interface is up but the line protocol is down, use the show frame-relay lmi exec command to see which LMI type is configured on the Frame Relay interface.
What are the different LMI types for Frame Relay?
Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A. Beginning with Cisco IOS Software Release 11.2, the LMI autosense feature allows a Frame Relay interface to autodetect the LMI type supported by the directly connected Frame Relay switch.
Can a frame relay interface be configured per DLCI?
Unlike Frame Relay encapsulation, LMI type cannot be configured on a per-DLCI basis. It has to be configured at the interface level. When manually configuring the LMI type on the Frame Relay interface, the selected LMI type on the router must match the LMI type supported by the connected Frame Relay switch.
What is the success rate for Frame Relay?
Success rate is 0 percent (0/5) After the keepalive interval at Router R1’s serial interface 4/2 is restored to 10 seconds to match the Frame Relay switch’s settings, the LMI status messages are exchanged properly between R1 and the Frame Relay switch.
Is the Frame Relay network a shared network?
And those tubes indicate permanent virtual circuits, but they’re usually permanent with regards to Frame Relay. So the Frame Relay provider is a shared network provided by WAN switches and many different customers can have their own permanent virtual circuits, or PVCs, set up.