Dear Community,
I am facing an interesting issue. My router is complaining of the following:
Jun 20 16:45:31.820 GMT: %IP-4-DUPADDR: Duplicate address 172.29.68.2 on GigabitEthernet0/0.110, sourced by c4b3.6a22.46e0
Jun 20 16:46:01.820 GMT: %IP-4-DUPADDR: Duplicate address 172.29.68.2 on GigabitEthernet0/0.110, sourced by c4b3.6a22.46e0
Jun 20 16:46:31.820 GMT: %IP-4-DUPADDR: Duplicate address 172.29.68.2 on GigabitEthernet0/0.110, sourced by c4b3.6a22.46e0
Jun 20 16:47:01.840 GMT: %IP-4-DUPADDR: Duplicate address 172.29.68.2 on GigabitEthernet0/0.110, sourced by c4b3.6a22.46e0
Jun 20 16:47:32.684 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:48:02.684 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:48:32.684 GMT: %IP-4-DUPADDR: Duplicate address 10.78.27.4 on GigabitEthernet0/0.402, sourced by c4b3.6a22.46e0
Jun 20 16:49:02.684 GMT: %IP-4-DUPADDR: Duplicate address 10.180.49.2 on GigabitEthernet0/0.401, sourced by c4b3.6a22.46e0
Jun 20 16:49:32.820 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:50:02.820 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:50:32.820 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:51:02.820 GMT: %IP-4-DUPADDR: Duplicate address 10.78.28.5 on GigabitEthernet0/0.200, sourced by c4b3.6a22.46e0
Jun 20 16:51:32.820 GMT: %IP-4-DUPADDR: Duplicate address 10.78.24.2 on GigabitEthernet0/0.250, sourced by c4b3.6a22.46e0
However, when I go to the core switch this router is connected to and submit the "show mac address-table address c4b3.6a22.46e0" command, the switch is saying its learning this MAC from this router.
SW01#show mac address-table address c4b3.6a22.46e0
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
1 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
2 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
5 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
110 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
200 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
250 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
255 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
401 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
402 c4b3.6a22.46e0 DYNAMIC Gi1/0/1
Total Mac Addresses for this criterion: 9
However, I cannot for the life of me find this MAC address on this router. No interfaces on this router have this MAC address. Has anyone run into this issue before?
The router is a 2921 running the following code: Version 15.7(3)M4b
Thank you.
