Fault Detection
Redundant-Link Configuration A–11
Fault Detection Comparison
Table A-5 shows the difference in failure detection between partial fault
detection and full fault detection.
Table A-5: Comparison of Partial Fault Detection to Full Fault
Detection
If a link failure occurs
in the master port’s...
Then partial fault
detection...
Then full fault
detection...
TX Link
Does not detect the
failure
Detects the failure
RX Link
Detects the failure
Detects the failure
Recommendations for Redundant-Link Configuration
Consider the following recommendations when configuring the
PORTswitch 900FP as redundant links:
•
Use responder ports (rather than nonresponder ports) whenever
possible.
•
If you use a combination of responder ports and nonresponder ports,
assign the responder ports to the primary link and the nonresponder
ports to the secondary link.
•
Assign the remote ports (responder or nonresponder) to separate
modules to ensure that one of the two remote ports is functional if a
remote module fails.
•
Whenever possible, configure primary and secondary link cables into
separate pathways to avoid a single point of failure.
