LevelOne GTL-2691 - Manual (Page 471)

C HAPTER 14 | Basic Administration Protocols
Ethernet Ring Protection Switching
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Control VLAN must be tagged. Failure to observe these restrictions can
result in a loop in the network.
Once the ring has been activated, the configuration of the control VLAN
cannot be modified. Use the Admin Status parameter to stop the ERPS
ring before making any configuration changes to the control VLAN.
◆ Propagate TC – Enables propagation of topology change messages
from a secondary ring to the primary ring. (Default: Disabled)
When a secondary ring detects a topology change, it can pass a
message about this event to the major ring. When the major ring
receives this kind of message from a secondary ring, it can clear the
MAC addresses on its ring ports to help the second ay ring restore its
connections more quickly through protection switching.
When the MAC addresses are cleared, data traffic may flood onto the
major ring. The data traffic will become stable after the MAC addresses
are learned again. The major ring will not be broken, but the bandwidth
of data traffic on the major ring may suffer for a short period of time
due to this flooding behavior.
◆ Sub Domain – A secondary ERPS ring which uses this primary ring for
sending control packets.
◆ Major Domain – The ERPS ring used for sending control packets.
This switch can support up to two rings. However, ERPS control packets
can only be sent on one ring. This parameter is used to indicate that
the current ring is a secondary ring, and to specify the major ring which
will be used to send ERPS control packets.
The Ring Protection Link (RPL) is the west port and can not be
configured. So the physical port on a secondary ring must be the west
port. In other words, if a domain has two physical ring ports, this ring
can only be a major ring, not a secondary ring (or sub-domain) which
can have only one physical ring port. The major domain therefore
cannot be set if the east port is already configured.
W EB I NTERFACE
To create an ERPS ring:
1.
Click Administration, ERPS.
2.
Select Configure Domain from the Step list.
3.
Select Add from the Action list.
4.
Enter a name for the ring in the “Domain Name” field.
5.
Click Apply.