Administrator Guide
Figure 41. Multiple Rings Connected by a Single Switch Example
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 specied 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)