Deployment Guide

Figure 39. Example of Multiple Rings Connected by Single Switch
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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Force10 Resilient Ring Protocol (FRRP)