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516 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
Initializing a new ERN
15
Hold-off timer — Each ERN uses a hold-off timer to delay reporting a port failure. When the
timer expires, the ERN checks the port status. If the issue still exists, the failure is reported. If
the issue does not exist, nothing is reported.
Message interval — This is an operator configurable feature for sending out R-APS messages
continuously when events happen.
Initializing a new ERN
A newly configured Version 2 ERP topology with four ERNs initializes as described in this section.
The ERNs have the following roles:
ERN 2 is the RPL owner.
ERNs 1, 3, and 4 are non-RPL nodes.
Figure 128 shows the first step of initialization beginning from ERN 4, a non-RPL node. The actions
of each ERN are:
ERN 1 takes no action. Both ports are in the forwarding state.
ERN 2 (RPL owner) takes no action. Both ports, including the RPL port, are in the VLAN port
forwarding state.
ERN 3 takes no action. Both ports are in the forwarding state.
From the Init state ERN 4 stops all timers (guard, WTR, WTB), blocks the left port, unblocks the
right port, transmits R-APS (NR) messages, and enters the Pending state.
FIGURE 128 Initializing an ERN topology - I
Figure 129 shows the next sequence of events. Next, ERN 1 initializes. The actions of each ERN
are:
ERN 1 stops all timers (guard, WTR, WTB), blocks the left port, unblocks the right port,
transmits R-APS (NR) messages, and enters the Pending state.
ERN 2 takes no action. Both ports are in the forwarding state.
ERN 3 takes no action. Both ports are in the forwarding state.
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