5-46
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
PRODUCT SETUP
CHAPTER 5: SETTINGS
5
PRT2 REDUNDANCY
— Determines if ports 2 and 3 operate in redundant or independent mode. If a license for PRP was
purchased, the options are None, Failover, and PRP. If a license for PRP was not purchased, the options are None and
Failover. In non-redundant mode (
REDUNDANCY
set to None), ports 2 and 3 operate independently with their own MAC, IP,
and mask addresses. If
REDUNDANCY
is set to Failover, the operation of ports 2 and 3 is as follows:
•
Ports 2 and 3 use the port 2 MAC address, IP address, and mask
•
The configuration fields for IP address and mask on port 3 are hidden
•
Port 3 is in standby mode and does not actively communicate on the Ethernet network but monitors its link to the
Multilink switch. If port 2 detects a problem with the link, communications is switched to Port 3. Port 3 is, in effect,
acting as a redundant or backup link to the network for port 2. Once port 2 detects that the link between itself and the
switch is good and that communication is healthy for five minutes, then switching back to port 2 is performed. The
delay in switching back ensures that rebooted switching devices connected to the L60, which signal their ports as
active prior to being completely functional, have time to completely initialize themselves and become active. Once
port 2 is active again, port 3 returns to standby mode.
If
REDUNDANCY
is set to PRP, the operation of ports 2 and 3 is as follows:
•
Ports 2 and 3 use the port 2 MAC address, IP address, and mask
•
The configuration fields for IP address and mask on port 3 are overwritten with those from port 2. This is visible on the
front panel but not displayed in the EnerVista software.
•
Port 2
MCST ADDRESS
field is visible
•
The port 2 PTP function still uses only port 2 and the port 3 PTP function still uses only port 3. The relay still
synchronizes to whichever port has the best master. When ports 2 and 3 see the same master, as is typically the case
for PRP networks, the port with the better connectivity is used.
Behavior for GOOSE messages is as follows:
•
If
REDUNDANCY
is set to Failover or PRP, In order to transmit a GOOSE message on port 2, the CID file must be
configured to have the corresponding GSE element in both ConnectedAPs S2 and S3. In the EnerVista software, the
TxGOOSE PORT ASSIGNMENT
needs to be "Ports-1,2,3" to transmit GOOSE on both ports 1 and 2, or "Ports-2,3" to have
GOOSE only on port 2, with failover/ PRP.
•
If
REDUNDANCY
is set to PRP, the port 2 configured GOOSE message is simultaneously transmitted on ports 2 and 3
•
If
REDUNDANCY
is set to failover and the port 2 link fails, then only the port 2 configured GOOSE message is transmitted
on port 3
For any changes to this setting to take effect, restart the unit.
PRT2 PRP MCST ADDR
— This setting allows the user to change the multicast address used by the PRP supervision frames.
This setting is available if
REDUNDANCY
is set to PRP. All devices in the same PRP network need to have the same multicast
address. Choose an address that does not conflict with another multicast protocol.
5.3.5.5 Far-End Fault Indication (FEFI)
Since 100BASE-FX does not support Auto-Negotiation, a Far-End Fault Indication (FEFI) feature is included since UR 7 that
allows for detection of link failures.
The purpose of the Far-End Fault feature is to allow the stations on both ends of a pair of fibers to be informed when there
is a problem with one of the fibers. Without the Far-End Fault feature, it is impossible for a fiber interface to detect a
problem that affects only its transmit fiber.
When the Far-End Fault feature is supported, a loss of receive signal (link) causes the transmitter to generate a Far-End
Fault pattern in order to inform the device at the far end of the fiber pair that a fault has occurred.
When the local receiver again detects a signal, the local transmitter automatically returns to normal operation.
If a Far-End Fault pattern is received by a fiber interface that supports the Far-End Fault feature and it is enabled, it reacts
by dropping the link as if there were no signal at all.
The two ports must be connected to completely independent LANs with no single point of failure, such as common
power supplies that feed switches on both LANs.
