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fcs

fcs

Syntax


                        
                           fcs (16 | 32);

Hierarchy Level


                        
                           [edit interface e1-fpc/pic/port],
                           
                           [edit interface t1-fpc/pic/port],
                           
                           [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]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

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

On a channelized OC12 interface, the SONET/SDH fcs statement is not supported. To configure FCS on each DS3 channel, you must include the t3-options fcs statement in the configuration for each channel. For SONET/SDH, the channelized OC12 interface supports DS3 to STS-1 to OC12. For SDH, the channelized OC12 interface supports NxDS3 to NxVC3 to AU3 to STM.

Note: When configuring E1 interfaces on the 10-port Channelized E1/T1 IQE PIC, fcs must be set at the [edit interface e1-fpc/pic/port] hierarchy level.

When configuring T1 interfaces on the 10-port Channelized E1/T1 IQE PIC, fcs must be set at the [edit interface t1-fpc/pic/port] hierarchy level.

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 might not support 32-bit checksums.

Usage Guidelines

See Configuring the E1 Frame Checksum, Configuring the E3 Frame Checksum, Configuring SONET/SDH Physical Interface Properties, Configuring the T1 Frame Checksum, and Configuring the T3 Frame Checksum.

Required Privilege Level

interface—To view this statement in the configuration.

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

fcs