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VPP L2LEARN Configuration
When VPP dataplane connects to an L2 domain, it learns MAC addresses of devices in the domain. By default, the number of MAC addresses it can learn is limited.
You can configure the limit using the following command:
This parameter sets the maximum number of MAC addresses that can be learned in the L2 domain. If you have many devices, you may need to increase this limit to ensure VPP learns all MAC addresses.
Potential Issues and Troubleshooting
Improper L2LEARN configuration can lead to various issues, including:
MAC address learning failure in the L2 domain if the limit is set too low
Increased packet loss or latency for devices that aren’t learned
Overall dataplane instability when handling L2 traffic
Consider increasing the L2LEARN limit if you experience issues with MAC address learning or if you have many devices in the L2 domain.