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Routing & Switching · Advanced

MAC Mobility

An EVPN mechanism using a sequence-number extended community to track hosts moving between VTEPs and to detect duplicate MACs.

Definition

When a host moves, the new VTEP advertises its Type 2 route with an incremented sequence number, causing others to update. Excessive moves within a window trigger duplicate MAC detection and suppression.

Example

show l2route evpn mac all

Exam tip

Duplicate MAC detection freezes a MAC that moves too often, usually a loop or misconfiguration.

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