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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:

  1. In configuration mode, go to the [edit interfaces interface-name sonet-options] hierarchy level.
  2. Configure the fcs option with 32-bit checksum.

To return to default 16-bit frame checksum:

  1. In configuration mode, go to the [edit] hierarchy level.
  2. Delete the fcs option.

To configure 16-bit frame checksum explicitly:

  1. In configuration mode, go to the [edit interfaces interface-name sonet-options] hierarchy level.
  2. Configure the fcs option a 16-bit checksum explicitly.

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.