Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario Pagina 551

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Multi-Service IronWare Switching Configuration Guide 521
53-1003036-02
Manual switch
15
Figure 135 shows a simple Ethernet ring topology before a failure. This diagram shows dual-end
blocking enabled (thick line) between ERNs one (RPL node) and 6 (RPL owner). ERNs 3, 2, 4, and 5
are non-RPL nodes.
FIGURE 135 ERP topology
Figure 136 shows the same Ethernet ring topology after a failure at the forwarding port of ERN 4
when a signal fail triggered, and ring protection was needed. ERN 6 unblocked the RPL port and
the RPL node changed the blocking port to the forwarding state.
FIGURE 136 ERP topology in a Protected state
Manual switch
In the absence of a failure, an operator-initiated manual switch (MS) moves the blocking role of the
RPL by blocking a different ring link and initiates the node sending a R-APS (MS) to inform the RPL
owner to unblock the RPL. This can occur if no higher priority request exists in the ring. See
Figure 137. The thick line between ERNs 1 and 2 indicate that dual-end blocking is enabled.
FIGURE 137 Manual Switch example
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