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Flow-Based and Packet-Based Processing

  • Unknown unicast drop configuration for VLAN interfaces (QFX5120-32C, QFX5120-48T, QFX5120-48Y, and QFX5120-48YM)—You can enhance network performance and prevent traffic storms by configuring your switch to drop unknown unicast packets. This action prevents the flooding of unicast packets with unknown destination MAC addresses across VLAN interfaces.

    By default, this feature is disabled. When you enable this feature, the switch learns and adds the source MAC address to the MAC address table. The switch drops packets with unlearned destination MAC addresses. This approach ensures efficient network resource usage and optimal network performance.

    To enable the discarding of packets, use the set switch-options unknown-unicast-forwarding vlan vlan-name drop command.

    To disable the discarding of unknown unicast packets (if you had earlier enabled the feature), use the delete switch-options unknown-unicast-forwarding vlan vlan-name drop command.

    [See Understanding and Preventing Unknown Unicast Forwarding.]