Routing - GE 850 Instruction Manual

DEVICE

Routing

5–26
PRT4 OPERATION
Range: Independent, LLA, PRP
Default: Independent
This setting determines the mode of operation for ports 4 and 5: INDEPENDENT, LLA or
PRP.
INDEPENDENT operation: ports 4 and 5 operate independently with their own MAC and
IP address.
LLA operation: the operation of ports 4 and 5 are as follows:
Ports 4 and 5 use port 4's MAC and IP address settings while port 5 is in standby mode in
that it does not actively communicate on the Ethernet network but monitors its link. If
Port 4 is active and the link loss problem is detected, communications is switched to Port
5 immediately. Port 5 is, in effect, acting as a redundant or backup link to the network
for port 4.
LLA (Link Loss Alert) is a proprietary feature supported by the 8 Series relay fiber optic
ports. When enabled on an 8 Series fiber optic port, this feature is able to detect a failure
of the fiber link. If port 4's OPERATION is set to LLA, the detection of a link failure by this
feature triggers the transfer of communications from port 4 to port 5. If LLA is enabled
on a port with a non-fiber SFP, the target message "LLA not supported by Prt (4 or 5)" is
displayed on the keypad and an event is logged.
PRP (Parallel Redundancy Protocol) operation: ports 4 and 5 use the same MAC address
and combine information at the link layer. It is intended to only be used if the two ports
are connected to separate parallel LAN's. In this mode of operation both ports cannot be
connected to the same LAN. The receiving devices (850 ) process the first frame received
and discard the duplicate through a link redundancy entity (LRE) or similar service that
operates below layer 2. Aside from LRE, PRP uses conventional Ethernet hardware but
both ports must know they are in PRP. Ports of PRP devices operating with the same
Internet Protocol (IP) addresses for traffic that uses IP Management protocols such as
Address Resolution Protocol (ARP) must operate correctly.
Duplicate Discard mode (only mode supported by the 8 Series). This is the normal
setting for PRP operation and once set it allows the sender LRE to append a six-octet
field that contains a sequence number, the Redundancy Control Trailer (RCT) to both
frames it sends. The receiver LRE uses the sequence number of the RCT and the source
MAC address to detect duplicates. It forwards only the first frame of a pair to its upper
layers.
When the configuration card is present, a default route and a maximum number of 6 static
routes can be configured. The default route is used as the last choice, if no other route
towards a given destination is found.
Path:
Setpoints > Device > Communications > Routing > Default Route
GATEWAY ADDRESS
Range: Standard IPV4 unicast address format (0.0.0.1 to 223.255.255.254)
Default: 127.0.0.1
This setting sets the gateway of the default route to be used by IP traffic sent from the
relay, if no other route towards a given IP destination is found.
This setting is available only if the communications card is present.
Path:
Setpoints > Device > Communications > Routing > Static RT1 (2 to 6)
RT1 (2,3,4,5,6) DESTINATION
Range: Standard IPV4 network address format (0.0.0.1 to 223.255.255.254)
Default: 127.0.0.1
This setting sets the destination IPv4 route. This setting is available only if the
communications card is present.
CHAPTER 5: DEVICE, SYSTEM, INPUT AND OUTPUT SETPOINTS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL