2019年6月24日（月）
The LMI is therefore a local keepalive
Therefore, using the defaults, two send or receive errors would have to be received within the event window of three events for the VC to be considered down. Finally, passive reply mode allows the router to respond to requests, but no timers are set and no events are tracked. Know the details and youre on your way to Cisco certification exam success!
Frame Relay End-To-End Keepalive defaults:Two send or receive errors must be registered in order for the VC to be considered down. Bidirectional mode enables both the send and receive process enabled on the router, meaning that the router will send requests and process responses (send side) and will also respond to remote requests for information (receive side).This being Cisco, we've got to have some modes, right? FREEK has four operational modes.One of the first things you learned about Frame is that the LMI also serves as a keepalive, or a heartbeat - and if three consecutive LMIs are missed, the line protocol goes down. There's a limitation to LMI as a keepalive, though.What you have to keep in mind about FREEK is that each and every PVC needs two separate keepalive processes.The timer mentioned earlier - the amount of timea router waits for a response - is set to 10 secondsWorking with Frame Relay end-to-end keepalives is just one Frame skill youll need to pass the CCNP exams and I wouldnt be surprised to see them on a CCIE exam. Reply mode enables only the receive process.
Remember, with a PVC, there's no guarantee that the path taking through the frame relay cloud to get from R1 to R2 is going to be the same path taken to go back from R2 to R1. If enough error events are recorded, the VC's keepalive status is marked as down. The router will send single-phase relay Manufacturers
requests and process responses to those requests, but will not answer requests from other routers.
The LMI is therefore a local keepalive that does not reflect any possible issues on the remote end of the virtual circuit. One process will be used to send requests for information and handle the responses to these requests; this is the send side. The router will respond to requests from other routers but will initiate no requests of its own.Taking the LMI concept to the next logical level, Frame Relay End-To-End Keepalives (FREEK, one of the least-heard Cisco acronyms for some reason) are used to verify that endpoint-to-endpoint communications are functioning properly. The LMI is exchanged only between the DTE and the closest DCE.The event window size is three. If one is not received, an error event is noted.The process that responds to the other side's requests is the receive side. Request mode enables only the send process. The event window is the number of events considered by the router when determining the status of the VC. When the send side transmits a keepalive request, a response is expected in a certain number of seconds
Frame Relay End-To-End Keepalive defaults:Two send or receive errors must be registered in order for the VC to be considered down. Bidirectional mode enables both the send and receive process enabled on the router, meaning that the router will send requests and process responses (send side) and will also respond to remote requests for information (receive side).This being Cisco, we've got to have some modes, right? FREEK has four operational modes.One of the first things you learned about Frame is that the LMI also serves as a keepalive, or a heartbeat - and if three consecutive LMIs are missed, the line protocol goes down. There's a limitation to LMI as a keepalive, though.What you have to keep in mind about FREEK is that each and every PVC needs two separate keepalive processes.The timer mentioned earlier - the amount of timea router waits for a response - is set to 10 secondsWorking with Frame Relay end-to-end keepalives is just one Frame skill youll need to pass the CCNP exams and I wouldnt be surprised to see them on a CCIE exam. Reply mode enables only the receive process.
Remember, with a PVC, there's no guarantee that the path taking through the frame relay cloud to get from R1 to R2 is going to be the same path taken to go back from R2 to R1. If enough error events are recorded, the VC's keepalive status is marked as down. The router will send single-phase relay Manufacturers
requests and process responses to those requests, but will not answer requests from other routers.The LMI is therefore a local keepalive that does not reflect any possible issues on the remote end of the virtual circuit. One process will be used to send requests for information and handle the responses to these requests; this is the send side. The router will respond to requests from other routers but will initiate no requests of its own.Taking the LMI concept to the next logical level, Frame Relay End-To-End Keepalives (FREEK, one of the least-heard Cisco acronyms for some reason) are used to verify that endpoint-to-endpoint communications are functioning properly. The LMI is exchanged only between the DTE and the closest DCE.The event window size is three. If one is not received, an error event is noted.The process that responds to the other side's requests is the receive side. Request mode enables only the send process. The event window is the number of events considered by the router when determining the status of the VC. When the send side transmits a keepalive request, a response is expected in a certain number of seconds
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