Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 973

Network interfaces configuration
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3, ..., 3*n. Their use was still unspecified although they might have been used to
assist in frame alignment. You can configure an incrementing STM ID to enable your
Juniper Networks router to interoperate with older equipment that relies on these
bytes for frame alignment.
The STM identifier has a precise definition in the SDH specifications. In ITU-T
Recommendation G.707, Network node interface for the synchronous digital hierarchy
(SDH) (03/96), Section 9.2.2.2.
You can explicitly configure an incrementing STM ID rather than a static one in the
SDH overhead by including the
interface-name sonet-options]
for SDH mode; do not use it for SONET mode.
To explicitly disable incrementing of the STM ID, include the following statement:
Configuring the SONET/SDH Frame Checksum
By default, SONET/SDH interfaces use a 16-bit frame checksum. You can configure
a 32-bit checksum, which provides more reliable packet verification. However, some
older equipment might not support 32-bit checksums.
To configure a 32-bit checksum, include the
interface-name sonet-options]
To return to the default 16-bit frame checksum, delete the
the configuration:
To explicitly configure a 16-bit checksum, include the
interfaces interface-name sonet-options]
On a channelized OC12 interface, the
To configure the frame checksum sequence (FCS) on each DS3 channel, you must
include the
[edit interfaces so-fpc/pic/port sonet-options]
z0-increment;
[edit interfaces so-fpc/pic/port sonet-options]
no-z0-increment;
[edit interfaces so-fpc/pic/port sonet-options]
fcs 32;
[edit]
user@host# delete interfaces so-fpc/pic/port sonet-options fcs 32
[edit interfaces so-fpc/pic/port sonet-options]
fcs 16;
t3-options fcs
statement in the configuration for each channel.
Chapter 61: Configuring SONET/SDH Interfaces
statement at the
z0-increment
hierarchy level. You should include this statement only
fcs
statement at the
hierarchy level:
hierarchy level:
sonet-options fcs
Configuring SONET/SDH Physical Interface Properties
[edit interfaces
[edit interfaces
statement from
fcs 32
fcs
statement at the
[edit
statement is not supported.
903

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