Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 980

JUNOS 10.1 Network Interfaces Configuration Guide
Example: Configuring SONET/SDH Defects to Be Ignored
Prevent an LOS from bringing down an interface. An LOS can lead to the following
defects:
Configuring Virtual Tributary Mapping
You can configure virtual tributary mapping to use KLM mode or ITU-T mode. By
default, virtual tributary mapping uses KLM mode.
For the Channelized STM1 IQ and IQE PICs, you can configure virtual tributary
mapping by including the
sonet-options]
910
Configuring SONET/SDH Physical Interface Properties
the defect is still present, the SONET/SDH defect starts the 250 millisecond down
timer. After this has expired and again assuming the defect is still outstanding,
the interface will be marked down. For more information about interface hold
timers, see "Damping Interface Transitions" on page 150.
Some defects are reported through a periodic poll (once every second). For these
defects, there could be up to one second lost before the defect is detected and
the hold timer is started. The hold timer expires in precisely the amount of time
configured. At that point, the existence of the defect is checked again and the
interface is marked up or down accordingly. These defects are as follows:
lol
pll
ber-sf
ber-sd
We recommend the following settings:
Configure SONET/SDH defect timers on no more than 64 interfaces per FPC.
Configure a combined up hold time and down hold time for a SONET/SDH
defect to be at least 100 milliseconds.
AIS-L
LOF
PLL
RFI-L
RFI-P
[edit interfaces sonet-options trigger]
ais-l ignore;
lof ignore;
los ignore;
pll ignore;
rfi-l ignore;
rfi-p ignore;
vtmapping
hierarchy level:
statement at the
[edit interfaces cau4-fpc/pic/port