Two NE40s are connected with a distance of 70km, and two GE ports are configured with APDP. Services run well. However, one NE40 cannot receive APDP packets abruptly, and the local optical interface is down, but the counterpart at remote is up. Check the traffic at both optical interfaces, and only data transmitted is found, without that received. NMS has not alarm information indicating that the optical interfaces are down.
%Oct 18 21:00:22 2005 KFQ_R_A IFNET/5/APDP:APDP interface GigabitEthernet2/0/
0 recieve 489 packets and discard rate 2% %Oct 18 21:09:12 2005 KFQ_R_A RM/5/RTLOG:Last neighbor down event: ROUTER ID:
10.1.1.2 LOCAL ADDRESS: 10.1.2.10 REMOTE ADDRESS: 10.1.2.9 REASON: DeadInterval timerovertime
%Oct 18 21:09:12 2005 KFQ_R_A IFNET/5/UPDOWN:Interface GigabitEthernet2/0/0 Turns into DOWN state
NMS has no alarm information indicating that the interface is down.
It is found that ER is in re-construction, with much dust on site. Detect the optical power of fibers, and one is normal, and the other is at -26.89DB which is out of normal range. Check the tail fiber by segments, and the optical fiber power on ODF in ER without construction is －9.46db. Clean all the flange and tail fiber heads, and the optical power is recovered.
1. Two GE interfaces are connected through naked cable, but one interface is down, and the other works well, so one of optical fibers is problematic.
2. The other optical interfaces on the same LPU are normal, so the optical module may be problematic.
3. The physical interface and protocols are down, so APDP may fail.
If ER does not have a good environment, optical lines will be influenced by dust.