Router R5 has the overload parameter configured. Which statement is true?
A.
R5 will purge its LSAs from the network until the overload condition is cleared.
B.
R5 will increase its link metrics to 65535 and will stop forwarding transit traffic to OSPF
destinations.
C.
R5 will increase its link metrics to 65535 and will continue to forward transit traffic to OSPF
destinations.
D.
R5 will send an overload LSA to its neighbors to indicate it is in the overload state.
Explanation:
I believe B is correct:
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Answer is B
http://www.juniper.net/techpubs/en_US/junos12.1/topics/topic-map/ospf-overload-mode.html
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correct answer is B,
as its set the value 65535 and force the router to not participate in Transit traffic..
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Answer C is correct, not B. By setting the overload bit, the metrics increase to 65535. By setting the metric so high, it basically forces the other OSPF routers in the network to route around this given router, thereby finding another path to the destination so this router will not be used for transit traffic anymore once convergence occurs. However, the router will not stop forwarding traffic during and after convergence, the overload bit just increases the metric in such a way that all transit traffic is moved away from this router.
We use this in maintenance windows to ensure that our traffic does not transit through the router that is being placed into maintenace.
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Answer C is correct, overload doesn’t means it’s going to stop all traffic
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Use case of overload is to stop traffic transiting the box, hence answer B is correct not C.
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Answer C is correct
In OSPF the overload bit is set the router increases the metric to 65535 and is still involved in the forwarding of traffic, just will not be the “preferred” path in normal operation
In ISIS, when the overload bit is set the router will not forward any transiting traffic
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local routing device running OSPF to appear to be overloaded, which allows the local routing device to participate in OSPF routing, but not for transit traffic. When configured, the transit interface metrics are set to the maximum value of 65535
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Overload on OSPF only means setting the metric to max. (65535) and the transit path will look less preferred but if it’s the only path available still will forward transit traffic then statement will stop transit traffic is not 100% correct. ISIS behavior is different when overload bit is set effectively stopping transit traffic.
Answer C is correct
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