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Overlapping Base MAC address ranges on CES/CER manufactured at the same time, can lead to MAC learning problems.

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TitleOverlapping Base MAC address ranges on CES/CER manufactured at the same time, can lead to MAC learning problems.
Symptoms
Product type: NetIron CES/CER
VLANs not learning PortMAC addresses and therefore flooding the traffic destined to these MACs. This only happens when the following conditions are met:
1) Running one of the following software:

- 5.1.00c, 5.1.00d, 5.1.00e, 5.1.00f
- 5.2.00, 5.2.00a, 5.2.00b, 5.2.00c, 5.2.00d
- 5.3.00, 5.3.00a
2) Two CES/CERs that have Base MAC address which are within 128 addresses of each other.
3) Ports with the overlapping MAC address are on the same VLAN.
The issue is not applicable to MLX/XMR, and requires all the above conditions to be met.
Environment
Software Release: 5.1.00c/d/e/f; 5.2.00, 5.2.00a/b/c/d; 5.3.00, 5.3.00a
Fixed in Version: 5.2.00e, 5.3.00b and later releases
Cause
There are two CES/CERs that have Base MAC addresses which are within 128 addresses of each other.
Resolution
Upgrade to a version where this issue has been fixed - Software patch releases 5.2.00e, 5.3.00b and later versions of code.
Additional notes

Do not use two CES/CERs that might have been manufactured at the same time, that have overlapping MACaddresses in the same VLAN.

Use the command sh interface brief to see if MACs are overlapping between the two units.

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