Crc (Serial) - Cisco ASR 9000 Series Command Reference Manual

Serial Interface Commands on the Cisco ASR 9000 Series Router

crc (serial)

To set the length of the cyclic redundancy check (CRC) on a serial interface, use the crc command in serial
configuration mode. To return the CRC setting on a serial interface to the default setting, use the no form of
this command.
crc {16| 32}
no crc {16| 32}
Syntax Description
16
32
Command Default
The default is 16 bits for serial interfaces.
Command Modes
Serial configuration
Command History
Release
Release 3.9.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
CRC is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data.
The designators 16 and 32 indicate the length (in bits) of the frame check sequence (FCS). A CRC of 32 bits
provides more powerful error detection, but adds overhead. Both the sender and receiver must use the same
setting.
CRC-16, the most widely used error checking method throughout the United States and Europe, is used
extensively with WANs. CRC-32 is specified by IEEE standard 802 and as an option by some point-to-point
transmission standards. It is often used on Switched Multimegabit Data Service (SMDS) networks and LANs.
Task ID
Task ID
hdlc
Sets 16-bit CRC mode.
Sets 32-bit CRC mode.
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Modification
This command was introduced.
Operations
read, write
crc (serial)
Release 5.3.x
779