Intermittent ping lost - Duplicate IP address

Intermittent ping lost

When we ping 10.21.22.22 from 10.21.22.1, it gave intermittent ping lose due to duplicate IP address issue.

We observed the gateway IP address [ 10.21.22.1] was configured in two switches.

 

How to troubleshoot:

1.       Enable mac address-table notification mac-move on Core layer 3 switch [ SVI] .

2.       Check the logs.

3.       Dec 20 22:32:40.862 MST: %IP-4-DUPADDR: Duplicate address 10.21.22.1 on Vlan243, sourced by 0018.196e.a9c1

4.       Find out the device and change the IP address.

 

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