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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 fcs statement at the [edit interfaces interface-name sonet-options] hierarchy level:



[edit interfaces so-fpc/pic/port sonet-options]

fcs 32;

To return to the default 16-bit frame checksum, delete the fcs 32 statement from the configuration:



[edit]
user@host# delete interfaces so-fpc/pic/port sonet-options fcs 32

To explicitly configure a 16-bit checksum, include the fcs statement at the [edit interfaces interface-name sonet-options] hierarchy level:



[edit interfaces so-fpc/pic/port sonet-options]

fcs 16;

On a channelized OC12 interface, the sonet-options fcs statement is not supported. To configure the frame checksum sequence (FCS) on each DS3 channel, you must include the t3-options fcs statement in the configuration for each channel.

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