
Multi-Service IronWare Switching Configuration Guide 517
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Initializing a new ERN
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• ERN 4 stays in the Pending state, transmits R-APS (NR) messages, and continues to block the
left interface.
FIGURE 129 Initializing an ERP topology - II
Figure 130 shows the next sequence of events. The actions of each ERN are:
• ERN 1 terminates R-APS received on the blocked port, unblocks the non-failed port, stops
transmitting R-APS (NR) messages, and enters the Pending state.
• ERN 2 takes no action.
• ERN 3 takes no action.
• ERN 4 stays in the Pending state and transmits R-APS (NR) messages.
FIGURE 130 Initializing an ERP topology - III
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