Dell Z9500 Reference Manual page 337

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When BFD is enabled with VRRP neighbors, the VRRP protocol registers with the

BFD manager on the route processor. BFD sessions are established with all

neighboring interfaces participating in VRRP. If a neighboring interface fails, the

BFD agent on the line card notifies the BFD manager, which in turn notifies the

VRRP protocol that a link state change occurred.

Bidirectional Forwarding Detection (BFD)

Introduced on the C-Series.

Introduced on the E-Series.