Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 544)

514 Multi-Service IronWare Switching Configuration Guide
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Ethernet Ring Protection
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As a result, ERN 2, the RPL owner, unblocked the RPL, and the topology became stable and loop
free.
ERP messaging
In ERP, ERNs send R-APS messages. Figure 126 shows the general R-APS packet structure. For
details about the packet structures, see ITU-T G.8032.
FIGURE 126 R-APS packet structure
The destination MAC address (Dst Mac) is the first element in the packet and is of the form
00-00-00-00-00-<ERP ID>. The default value is 01. However, you can configure the ERP ID with the
raps-default-mac command. In ITU-T G.8032 Version 1 the default value is always used.
The Node ID indicates the base MAC address and can be found in the R-APS specific information
part of a R-APS message.
ERP operational states
RPL nodes can be in one of six different states in Version 2:
• Init
• Idle
• Protection state, which is designated as a signal fail (SF) event in the R-APS
• Manual-switch (MS)
• Forced-switch (FS)
• Pending (not available if using Version 1)