Description

This article explains the steps on how to identify ping failures across between 2 devices

Symptoms

Intermittent ping failures due to mac-moves.

Solution

Troubleshooting steps

1) Run pings from device A to device B
2) Run "monitor traffic interface <> no-resolve matching icmp layer2-headers
3) Check for the number of ICMP echo sent from A and number of ICMP echo received and replies sent from B.
4) Check the arp entries on device B
5) Check the MAC address in the ethernet-switching table using "show ethernet-switching table" output
6) If the mac/arp entries are toggling between 2 different interfaces then check the mac moves by running "show ethernet-switching mac-learning-log"
7) If the issue is due to mac-moves then the mac address will be added and deleted frequently.

Once the issue is narrowed down to mac-moves, troubleshoot the issue by referring following KB
Troubleshooting mac-move issues
 

Modification History

2024-08-08 : Article Created