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Multiple FRRP Rings
Up to 255 rings are allowed per system and multiple rings can be run on one system.
More than the recommended number of rings may cause interface instability. You can configure multiple
rings with a single switch connection; a single ring can have multiple FRRP groups; multiple rings can be
connected with a common link.
Member VLAN Spanning Two Rings Connected by One Switch
A member VLAN can span two rings interconnected by a common switch, in a figure-eight style
topology.
A switch can act as a Master node for one FRRP group and a Transit for another FRRP group, or it can be
a Transit node for both rings.
In the following example, FRRP 101 is a ring with its own Control VLAN, and FRRP 202 has its own Control
VLAN running on another ring. A Member VLAN that spans both rings is added as a Member VLAN to both
FRRP groups. Switch R3 has two instances of FRRP running on it: one for each ring. The example
topology that follows shows R3 assuming the role of a Transit node for both FRRP 101 and FRRP 202.
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.
Important FRRP Concepts
The following table lists some important FRRP concepts.
Concept Explanation
Ring ID Each ring has a unique 8-bit ring ID through which the ring is identified (for
example, FRRP 101 and FRRP 202, as shown in the illustration in Member VLAN
Spanning Two Rings Connected by One Switch.
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Force10 Resilient Ring Protocol (FRRP)