fcs

Syntax

fcs (32 | 16);

Hierarchy Level

[edit interfaces interface-name ds0-options],
[edit interfaces interface-name e1-options],
[edit interfaces interface-name e3-options],
[edit interfaces interface-name sonet-options],
[edit interfaces interface-name t1-options],
[edit interfaces interface-name t3-options]

Description

For E1/E3, SONET/SDH, and T1/T3 interfaces, configure the frame checksum on the interface. The checksum must be the same on both ends of the interface.

On a Channelized OC-12 interface, the SONET fcs statement is not supported. To configure FCS on each DS-3 channel, you must include the t3-options fcs statement in the configuration for each channel. For SONET, the Channelized OC-12 interface supports DS-3 to STS-1 to OC-12. For SDH, the Channelized OC-12 interface supports nxDS-3 to nxVC3 to AU3 to STM-n.

Options

16—Use a 16-bit frame checksum on the interface.

32—Use a 32-bit frame checksum on the interface. Using a 32-bit checksum provides more reliable packet verification, but some older equipment may not support 32-bit checksums.
Default: 16

Usage Guidelines

See Configure the E1 Frame Checksum, Configure the E3 Frame Checksum, Configure the SONET Frame Checksum, Configure T1 Frame Checksum, and Configure the T3 Frame Checksum.

Required Privilege Level

interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.