Bit error rate (BER) alarms are declared when the number of BIP-B2 errors hits a certain threshold. Depending on the threshold, there are two types of BER alarms. In both cases the interface is taken down.
To display SONET alarms and errors, use the following JUNOS CLI operational mode command:
Sample Output
The following sample output displays a BERR-SD error:
user@router2> show interfaces so-1/1/1
extensive [... Output truncated...]
Active alarms : BERR-SD
Active defects : None
SONET PHY: Seconds Count State
PLL Lock 0 0 OK
PHY Light 0 0 OK
SONET section:
BIP-B1 22 101
SEF 0 0 OK
LOS 0 0 OK
LOF 0 0 OK
ES-S 22
SES-S 0
SEFS-S 0
SONET line:
BIP-B2 22 103
REI-L 0 0
RDI-L 0 0 OK
AIS-L 0 0 OK
BERR-SF 0 0 OK
BERR-SD 11 53 OK
ES-L 22
SES-L 4
UAS-L 2
ES-LFE 0
SES-LFE 0
UAS-LFE 0
SONET path:
BIP-B3 22 166
REI-P 0 0
LOP-P 0 0 OK
AIS-P 0 0 OK
RDI-P 0 0 OK
UNEQ-P 0 0 OK
PLM-P 0 0 OK
ES-P 22
SES-P 3
UAS-P 1
ES-PFE 0
SES-PFE 0
UAS-PFE 0
Meaning
Bit error rates can be caused by any of the following situations:
