Understanding WAN Framing for 10-Gigabit Ethernet Trio Interfaces
If you use the wan-phy statement option at the [edit interfaces xe-fpc/pic/0 framing] hierarchy level to configure Trio WAN mode framing for 10-Gigabit Ethernet interfaces, then the alarm behavior of the link, although in full compliance with the IEEE 802.3ae 10-Gigabit Ethernet standard, might not be as expected.
In particular:
- The interface does not distinguish between loss of light (LOL), loss of phase lock loop (PLL), or loss of signal (LOS). If a loss of PLL or LOS alarm occurs, then both PLL and LOS alarms are raised. LOL is also raised because there is no separate LOL indication from the hardware.
- The interface does not raise LOS, PLL, or LOL alarms when the fiber in disconnected from the interface port. You must remove the hardware to raise this alarm.
- The interface line-level alarm indicator signal (AIS-L) is not always raised in response to a loss of framing (LOF) defect alarm.
- The interface path-level local channel defect (LCD-P) does not detect the AIS-P alarm, but does detect the path-level AIS (AIS-P) alarm.
- The interface does not detect AIS-L, but does detect LOP.
None of the alarm issues are misleading, but they make troubleshooting the root cause of problems more complex.
