Cisco CCNP Data Center 300-620 Question # 19 Topic 2 Discussion
300-620 Exam Topic 2 Question 19 Discussion:
Question #: 19
Topic #: 2
A network engineer must configure a Cisco ACI system to detect network loops for untagged and tagged traffic The loop must be detected and slopped by disabling an interface within 4 seconds Which configuration must be used?
To configure a Cisco ACI system to detect network loops for both untagged and tagged traffic and to stop the loop by disabling an interface within 4 seconds, the following configuration must be used:
Enable Mis-Cabling Protocol (MCP): MCP detects loops from external sources and will err-disable the interface on which Cisco ACI receives its own packet. This is crucial for preventing loops in the network1.
Configure MCP Transmit Frequency: Set the MCP transmit frequency to a value that allows for quick loop detection. The Cisco ACI fabric provides faster loop detection with transmit frequencies from 100 milliseconds to 300 seconds. To meet the requirement of detecting and stopping a loop within 4 seconds, you would set the transmit frequency to a value less than 4 seconds2.
Set Action on Loop Detection: Configure the MCP policies to identify loops and decide how to act upon them. You can set the policy to generate a syslog message or disable the port upon loop detection2.
Implement Error Disabled Recovery Policy: Configure an error disabled recovery policy to automatically re-enable ports that were disabled due to loop detection after a configurable interval2.
By implementing these configurations, the Cisco ACI system will be able to detect and stop network loops quickly and efficiently, ensuring network stability and preventing potential disruptions.
References :=
Cisco APIC Online Help - Loop Detection2
Cisco ACI Best Practices Quick Summary
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