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DES-7200 Configuration Guide Chapter 5 RERP Configuration
5-3
Link recovery:
When the interrupted link recovers in the Ethernet (the one between Transit1 and
Transit2 recovers normal, for example), Transit1 and Transit2 recognize the link
recovery information, and make the ports of the recovery link ends in the BLOCK
status, to forbid forwarding any messages. Then, they send the LINK UP
advertisement to the master. The master receives it and turns the secondary interface
in the BLOCK status, and then sends FLUSH NOW message to notify all controlled
device to clear all data VLAN related layer-2 address table information. When Transit1
and Transit2 find the link recovery devices receive the FLUSH NOW message, they
clear the layer-2 address table information in all data VLAN and then change the ports
in BLOCK status into the FORWARDING status.
Device abnormity detection:
When the primary port of the master sends the HELLO message on regular basis (at
an adjustable time interval, in seconds), if the secondary interface of the master does
not receive the HELLO message from the primary port of the master, it considers the
devices on the ring abnormal. Now, the master clears the data VLAN related layer-2
forwarding table information and sends the FLUSH NOW message to notify all
controlled device to clear the DATA VLAN layer-2 forwarding table information, and
then changes the BLOCK status of the secondary port into the FORWARDING status.
When the secondary port of the master receives the HELLO message from the primary
interface, it immediately turns the secondary port to the BLOCK status, and then sends
the FLUSH NOW message to notify the controlled devices to clear the layer-2 address
table information in all data VLANs.
Master failure detection:
The user can specify a secondary device as the backup master. When the backup
master does not detect the HELLO message sent from the master, it considers failure
of the master and escalates itself to the master.
After the backup master switches to the master device, if it receives the message from
the original master, it transfers the control to the original master and degrades again to
the backup master.
The RERP supports tangent multiple rings. In other words, it allows multiple rings to
share one devices. In this topology, two rings can run independently, which can be in
the same domain or belong to different domains.