Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 330

www.dell.com | support.dell.com Figure 18-1. Normal Operating FRRP Topology R2 TRANSIT Ring Direction Primary Forwarding Secondary Forwarding Primary Forwarding Primary Forwarding Secondary R1 Blocking MASTER Secondary Forwarding R3 TRANSIT A Virtual LAN (VLAN) is configured on all node ports in the ring. All ring ports must be members of the Member VLAN and the Control VLAN. The Member VLAN is the VLAN used to transmit data as described earlier. The Control VLAN is used to perform the health checks on the ring. The Control VLAN can always pass through all ports in the ring, including the secondary port of the Master node. Ring Status The Ring Failure notification and the Ring Status checks provide two ways to ensure the ring remains up and active in the event of a switch or port failure. Ring Checking At specified intervals, the Master Node sends a Ring Health Frame (RHF) through the ring. If the ring is complete, the frame is received on its secondary port, and the Master node resets its fail-period timer and continues normal operation. If the Master node does not receive the Ring Health Frame (RHF) before the fail-period timer expires (a configurable timer), the Master node moves from the Normal state to the Ring-Fault state and unblocks its Secondary port. The Master node also clears its forwarding table and sends a control frame to all other nodes, instructing them to also clear their forwarding tables. Immediately after clearing its forwarding table, each node starts learning the new topology. 330 | Force10 Resilient Ring Protocol