An existing network solution is using BFD in echo mode.
Several network devices are experiencing high CPU utilization, which an engineer has determined is related to the BFD feature.
Which solution should the engineer leverage to reduce the CPU load?
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A. B. C. D.A.
BFD (Bidirectional Forwarding Detection) is a protocol used to quickly detect failures in the forwarding path between two network devices. BFD operates by sending and receiving control packets between the devices at a very high frequency. BFD can be used in either asynchronous mode or echo mode.
In echo mode, BFD sends control packets using the same path that data packets would take between the devices. The receiving device responds to the packets by sending them back through the same path. This mode provides a more accurate detection of failures but can be more CPU-intensive.
If several network devices are experiencing high CPU utilization related to BFD in echo mode, the engineer should consider implementing a solution to reduce the CPU load. The correct answer in this case is B. Implement BFD asynchronous mode between peers with low CPU resources.
In asynchronous mode, BFD sends control packets without waiting for a response from the receiving device. This reduces the amount of processing required on the receiving device and can help to reduce CPU utilization. Asynchronous mode may not be as accurate as echo mode, but it is often sufficient for many network environments.
Option A, implementing slow timers between peers with low CPU resources, may reduce the frequency of BFD control packets and therefore reduce CPU utilization, but it may also increase the detection time for failures.
Option C, enabling BFD multi-hop on the devices with low CPU resources, would not necessarily reduce CPU utilization related to BFD in echo mode. Multi-hop is used when the BFD session needs to traverse multiple hops in the network.
Option D, utilizing carrier delay on all routers in the network, is not directly related to reducing CPU utilization related to BFD in echo mode. Carrier delay is used to introduce a delay in the activation of an interface to allow time for the link to stabilize before forwarding traffic.