April 5, 2020

Cisco CCNA/CCNP Certification Tutorial: Frame Relay End-To-End Keep lives

One of the principal things you found out about Frame is that the LMI additionally fills in as a keep alive, or a heartbeat – and if three sequential LMIs are missed, the line convention goes down. There’s an impediment to LMI as a keep alive, however. The LMI is traded uniquely between the DTE and the nearest DCE. The LMI is in this manner a nearby keep alive that doesn’t mirror any potential issues on the remote finish of the virtual circuit.  More info https://www.thebestdumps.com/

 

Taking the LMI idea to the following sensible level, Frame Relay End-To-End Keep lives (FREEK, one of the least-heard Cisco abbreviations for reasons unknown) are utilized to check that endpoint-to-endpoint correspondences are working appropriately.

 

What you need to remember about FREEK is that every single PVC needs two separate keepalive forms. Keep in mind, with a PVC, there’s no assurance that the way taking through the edge hand-off cloud to get from R1 to R2 will be a similar way taken to return from R2 to R1. One procedure will be utilized to send demands for data and handle the reactions to these solicitations; this is the send side. When the send side transmits a keep alive demand, a reaction is normal in a specific number of seconds. In the event that one isn’t gotten, a mistake occasion is noted. In the event that enough blunder occasions are recorded, the VC’s keep alive status is set apart as down.

 

The procedure that reacts to the opposite side’s solicitations is the get side. This being Cisco, we must have a few modes, correct? FREEK has four operational modes. Bidirectional mode empowers both the send and get process empowered on the switch, implying that the switch will send demands and procedure reactions (send side) and will likewise react to remote solicitations for data (get side).

 

Solicitation mode empowers just the send procedure. The switch will send demands and procedure reactions to those solicitations, yet won’t answer demands from different switches.

 

Answer mode empowers just the get procedure. The switch will react to demands from different switches however will start no solicitations of its own. At long last, inactive answer mode permits the switch to react to asks for, however no clocks are set and no occasions are followed.

 

Edge Relay End-To-End Keepalive defaults:

 

Two send or get mistakes must be enlisted all together for the VC to be considered down. The occasion window size is three. The occasion window is the quantity of occasions considered by the switch while deciding the status of the VC. Along these lines, utilizing the defaults, two send or get blunders would need to be gotten inside the occasion window of three occasions for the VC to be considered down.

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