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.
Answer is B
R5 will increase its link metrics to 65535 and will stop forwarding transit traffic to OSPF destinations
see reference below
http://www.juniper.net/techpubs/en_US/junos11.4/topics/topic-map/ospf-overload-mode.html
OSPF Overload Function Overview
If the time elapsed after the OSPF instance is enabled is less than the specified timeout, overload mode is set.
You can configure the local routing device so that it appears to be overloaded. An overloaded routing device determines it is unable to handle any more OSPF transit traffic, which results in sending OSPF transit traffic to other routing devices.
OSPF traffic to directly attached interfaces continues to reach the routing device. You might configure overload mode for many reasons, including:
Overview
You can configure a 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.
This example includes the following settings:
overload—Configures the local routing device so it appears to be overloaded. You might configure this if you want the routing device to participate in OSPF routing, but do not want it to be used for transit traffic, or you are performing maintenance on a routing device in a production network.
timeout seconds—(Optional) Specifies the number of seconds at which the overload is reset. If no timeout interval is specified, the routing device remains in the overload state until the overload statement is deleted or a timeout is set. In this example, you configure 60 seconds as the amount of time the routing device remains in the overload state. By default, the timeout interval is 0 seconds (this value is not configured). The range is from 60 through 1800 seconds.
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Hi Dylan,
I don´t agree with your statements as I think C is correct.
When overload parameter is configured, link metric is modified so Neighbours will start sending transit traffic to other routers. However, during that time router continues forwarding traffic as it arrives. When routing converges, transit traffic will eventually stop arriving to that router but that doesn´t mean that the router has stopped forwarding
Rgds
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I Agree with you DanyG, you’re right.
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So what’s the right answer B or C?
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I also agree with DanyG, the overload setting in OSPF just increase the metric of interfaces to 65 K, but, if there are not other alternatives paths to a given destination the overload router has to be transit for that traffic
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