No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.

Knowledge Base

Board Alarms Were Generated Due to Too Large Traffic on the Port of the NE40E

Publication Date:  2012-07-27  |   Views:  128  |   Downloads:  0  |   Author:  SU9100106464  |   Document ID:  EKB0000366074


Issue Description

According to the customer’s maintenance engineer working at the equipment room, the red alarm indicator was often on for LPU 2 of the NE40E. 

Alarm Information

The alarms generated by the device were collected as follows:
Jul 31 2008 15:54:01 TZ-XQ-R-NE40E-01 %%01SRM/2/TMLINEERR(l): LPU2 occur line error! Error Code=2.2!
Jul 31 2008 15:53:01 TZ-XQ-R-NE40E-01 %%01SRM/2/TMLINEERR(l): LPU2 occur line error! Error Code=2.1! 

Handling Process

After the port mirroring configuration was deleted, the problem was solved. 

Root Cause

1. The alarms were generated because packets were lost on LPU 2.
2. Checking GE 2/0/4, the engineer found the following information, indicating that the port was almost fully loaded with the traffic:
Last 30 seconds output rate: 968093056 bits/sec, 209961 packets/sec
3. Checking the configuration, the engineer found the device was configured with port mirroring. GE 2/0/4 was the monitoring port, whereas GE 1/0/0 and GE 2/0/0 were mirroring ports. During the busy hours, when the traffic on the two mirroring ports added up to more than 1 Gbit/s, the traffic overflowed and back pressure occurred on LPU 2, hence the alarms. 


When multiple mirroring ports were configured to mirror the traffic to one monitoring port, note the traffic on the mirroring ports.