Brocade TurboIron 24X Series Configuration Guide - Manual (Page 316)

282 Brocade TurboIron 24X Series Configuration Guide
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Metro Ring Protocol (MRP)
Ring initialization
The ring shown in Figure 7 shows the port states in a fully initialized ring without any broken links.
Figure 11 shows the initial state of the ring, when MRP is first enabled on the ring switches. All ring
interfaces on the master node and member nodes begin in the Preforwarding state (PF).
FIGURE 11 Metro ring – initial state
MRP uses Ring Health Packets (RHPs) to monitor the health of the ring. An RHP is an MRP protocol
packet. The source address is the MAC address of the master node and the destination MAC
address is a protocol address for MRP. The master node generates RHPs and sends them on the
ring. The state of a ring port depends on the RHPs.
Customer A
Customer A
Customer A
Customer A
Switch B
Switch A
Switch C
Switch D
F
F
F
F
PF
PF
PF
PF
PF PF
PF
PF
All ports start in
Preforwarding state.
Primary port on Master
node sends RHP 1
Master
Node