Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 510)

480 Multi-Service IronWare Switching Configuration Guide
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How ring breaks are detected and healed
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How ring breaks are detected and healed
Figure 109 shows ring interface states following a link break. MRP quickly heals the ring and
preserves connectivity among the customer networks.
FIGURE 109 MRP ring – ring break
If a break in the ring occurs, MRP heals the ring by changing the states of some of the ring
interfaces:
• Blocking interface – When the secondary interface on the master node transitions to a
blocking state it sets a timer defined by the preforwarding time configured. If the timer expires
before the interface receives a ring RHP, the interface changes state to preforwarding. Once
the secondary interface state is preforwarding:
• If the interface receives an RHP, the interface changes back to the blocking state and
resets the timer.