Dell Force10 S4820T S4820T Configuration Guide - Page 388

www.dell.com | support.dell.com • 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 18-1, "FRRP Components," in Force10 Resilient Ring Protocol (FRRP) lists some important FRRP concepts. Table 18-1. 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 the illustration in Member VLAN Spanning Two Rings Connected by One Switch. 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. 388 | Force10 Resilient Ring Protocol (FRRP)