Which function does the IP SLA ICMP ECHO operation perform to assist with troubleshooting?
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The IP SLA (Internet Protocol Service Level Agreement) feature on Cisco routers provides a mechanism to measure network performance and availability. One of the IP SLA operations available is ICMP ECHO, which sends echo request packets to a destination IP address and measures the response time and success rate of the echo replies.
The ICMP ECHO operation can assist with troubleshooting in several ways:
Packet-loss detection: The ICMP ECHO operation can detect packet loss by measuring the success rate of echo replies. If a router or network path is dropping packets, the success rate will be lower than expected, indicating a potential problem.
Congestion detection: The ICMP ECHO operation can also detect congestion by measuring the response time of echo replies. If the response time is consistently high, it could indicate that network congestion is causing delays in packet delivery.
Hop-by-hop response time: The ICMP ECHO operation can measure the response time of each hop (router) along the path between the source and destination. This can help identify where delays or packet loss is occurring.
One-way jitter measurements: Jitter is the variation in packet delay that can cause problems with real-time traffic like VoIP. The ICMP ECHO operation can measure one-way jitter by comparing the time between echo requests and the corresponding echo replies.
In summary, the ICMP ECHO operation of IP SLA can help troubleshoot network problems by measuring packet loss, congestion, hop-by-hop response time, and one-way jitter.