Planet Networking & Communication SGS-5240 Series User Manual page 169

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Also, the ring ports of the Control VLAN must be tagged. 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 always the west port.
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.
◆Non-ERPS Device Protection – Sends non-standard health-check packets when an owner node enters protection state
without any link down event having been detected through Signal Fault messages.(Default: Disabled)
Press Ringport button to configure force or manual mode on ring ports.
User's Manual of SGS-5240 Series Managed Switch
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