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

crc (POS)

crc (POS)
To set the length of the cyclic redundancy check (CRC) on a Packet-over-SONET/SDH (POS) interface, use
the crc command in POS configuration mode. To return the CRC setting on a POS interface to the 32-bit
default setting, use the no form of this command.
crc {16| 32}
no crc [16| 32]
Syntax Description
16
32
Command Default
The default CRC mode is 32 bits.
Command Modes
POS configuration
Command History
Release
Release 4.0.0
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
pos-dpt
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
694
Packet-over-SONET Interface Commands on the Cisco ASR 9000 Series Router
Sets 16-bit CRC mode.
Sets 32-bit CRC mode. The default is 32 bits.
Modification
This command was introduced.
Operations
read, write