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Other Added - Cisco CCNA / CCNP Certification Tutorial: Frame Relay End-To-End Keepalives
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The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on
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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.
What you have to keep in mind about FREEK is that each and every PVC needs two separate keepalive processes. 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. One process will be used to send requests for information and handle the responses to these requests; this is the send side. When the send side transmits a keepalive request, a response is expected in a certain number of seconds. If one is not received, an error event is noted. If enough error events are recorded, the VC's keepalive status is marked as down.
The process that responds to the other side's requests is the receive side.
This being Cisco, we've got to have some modes, right? FREEK has four operational modes.
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).
Request mode enables only the send process. The router will send requests and process responses to those requests, but will not answer requests from other routers.
Reply mode enables only the receive process. The router will respond to requests from other routers but will initiate no requests of its own.
Finally, passive reply mode allows the router to respond to requests, but no timers are set and no events are tracked.
Frame Relay End-To-End Keepalive defaults:
Two send or receive errors must be registered in order for the VC to be considered down.
The event window size is three. The event window is the number of events considered by the router when determining the status of the VC. 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.
The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on
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What you have to keep in mind about FREEK is that each and every PVC needs two separate keepalive processes. 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. One process will be used to send requests for information and handle the responses to these requests; this is the send side. When the send side transmits a keepalive request, a response is expected in a certain number of seconds. If one is not received, an error event is noted. If enough error events are recorded, the VC's keepalive status is marked as down.
The process that responds to the other side's requests is the receive side.
This being Cisco, we've got to have some modes, right? FREEK has four operational modes.
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).
Request mode enables only the send process. The router will send requests and process responses to those requests, but will not answer requests from other routers.
Reply mode enables only the receive process. The router will respond to requests from other routers but will initiate no requests of its own.
Finally, passive reply mode allows the router to respond to requests, but no timers are set and no events are tracked.
Frame Relay End-To-End Keepalive defaults:
Two send or receive errors must be registered in order for the VC to be considered down.
The event window size is three. The event window is the number of events considered by the router when determining the status of the VC. 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.
The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on
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The process that responds to the other side's requests is the receive side.
This being Cisco, we've got to have some modes, right? FREEK has four operational modes.
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).
Request mode enables only the send process. The router will send requests and process responses to those requests, but will not answer requests from other routers.
Reply mode enables only the receive process. The router will respond to requests from other routers but will initiate no requests of its own.
Finally, passive reply mode allows the router to respond to requests, but no timers are set and no events are tracked.
Frame Relay End-To-End Keepalive defaults:
Two send or receive errors must be registered in order for the VC to be considered down.
The event window size is three. The event window is the number of events considered by the router when determining the status of the VC. 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.
The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on
If you are currently experiencing problems making repayment of your credit card debt, then the time has come to consider switching your credit card account to a 0% account.However, if you make the wrong choice, you could end up in the situation where you actually pay more to the credit card company than would otherwise have been the case if you had stayed put! only the send process. The router will send requests and process responses to those requests, but will not answer requests from other routers.
Reply mode enables only the receive process. The router will respond to requests from other routers but will initiate no requests of its own.
Finally, passive reply mode allows the router to respond to requests, but no timers are set and no events are tracked.
Frame Relay End-To-End Keepalive defaults:
Two send or receive errors must be registered in order for the VC to be considered down.
The event window size is three. The event window is the number of events considered by the router when determining the status of the VC. 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.
The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on
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The timer mentioned earlier - the amount of time a router waits for a response - is set to 10 seconds
Working with Frame Relay end-to-end keepalives is just one Frame skill you’ll need to pass the CCNP exams – and I wouldn’t be surprised to see them on a CCIE exam. Know the details and you’re on your way to Cisco certification exam success!
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