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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Important FRRP Points

FRRP provides a convergence time that can generally range between 150ms and 1500ms for Layer 2 networks.

The Master node originates a high-speed frame that circulates around the ring. This frame, appropriately, sets up or breaks down the ring.
  • The Master node transmits ring status check frames at specified intervals.
  • You can run multiple physical rings on the same switch.
  • One Master node per ring — all other nodes are Transit.
  • Each node has two member interfaces — primary and secondary.
  • There is no limit to the number of nodes on a ring.
  • Master node ring port states — blocking, pre-forwarding, forwarding, and disabled.
  • Transit node ring port states — blocking, pre-forwarding, forwarding, and disabled.
  • STP disabled on ring interfaces.
  • Master node secondary port is in blocking state during Normal operation.
  • Ring health frames (RHF)
    • Hello RHF: sent at 500ms (hello interval); Only the Master node transmits and processes these.
    • Topology Change RHF: triggered updates; processed at all nodes.

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