Dell Force10 Z9000 FTOS Configuration Guide for Z9000 System - Page 345

• Multiple physical rings can be run on the same switch • One Master node per ring-all other nodes are Transit • Each node has 2 member interfaces-Primary, Secondary • No limit to the number of nodes on a ring • Master node ring port states-blocking, pre-forwarding, forwarding, disabled • Transit node ring port states-blocking, pre-forwarding, forwarding, 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) - Transmitted and processed by Master node only • Topology Change RHF - Triggered updates - Processed at all nodes Important FRRP Concepts Table 16-1 lists some important FRRP concepts. Table 16-1. FRRP Components Concept Ring ID Control VLAN Member VLAN Port Role Explanation Each ring has a unique 8-bit ring ID through which the ring is identified (e.g. FRRP 101 and FRRP 202 as shown in Figure 16-2. Each ring has a unique Control VLAN through which tagged Ring Health Frames (RHF) are sent. Control VLANs are used only for sending Ring Health Frames, and cannot be used for any other purpose. Each ring maintains a list of member VLANs. Member VLANs must be consistent across the entire ring. Each node has two ports for each ring: Primary and Secondary. The Master node Primary port generates Ring Health Frames (RHF). The Master node Secondary port receives the RHF frames. On Transit nodes, there is no distinction between a Primary and Secondary interface when operating in the Normal state. Force10 Resilient Ring Protocol (FRRP) | 345