How Ring Breaks Are Detected And Healed - Dell PowerConnect B-RX Configuration Manual

14

How ring breaks are detected and healed

How ring breaks are detected and healed
Figure 67
preserves connectivity among the customer networks.
FIGURE 67
If a break in the ring occurs, MRP heals the ring by changing the states of some of the ring
interfaces:
•
•
406
Shows the ring forwarding state following a link break. MRP quickly heals the ring and
Metro ring – ring break
F
F
Customer A
Blocking interface – The Blocking interface on the Master node has a dead timer. If the dead
time expires before the interface receives one of its ring's RHPs, the interface changes state to
Preforwarding. Once the secondary interface changes state to Preforwarding:
•
If the interface receives an RHP, the interface changes back to the Blocking state and
resets the dead timer.
•
If the interface does not receive an RHP for its ring before the Preforwarding time expires,
the interface changes to the Forwarding state, as shown in
Forwarding interfaces – Each member interface remains in the Forwarding state.
Customer A
F
F
Switch B
Switch C
Switch D
F
Customer A
F
F
Master
F
Switch A
Node
F
F
Figure 67.
BigIron RX Series Configuration Guide
Customer A
53-1002253-01