Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 551)

Multi-Service IronWare Switching Configuration Guide 521
53-1003036-02
Manual switch
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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