Cisco ONS 15454 - Page 199

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Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
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Appendix A Command Reference
[no] pos flag c2 <value>
[no] pos flag c2 <value>
Use this command to specify the C2 byte value for transmitted and received frames. Use the no form of
the command to return the C2 byte to it’s default value.
Defaults When changing the encapsulation on a POS port between LEX and PPP/HDLC, the scrambling and c2
settings will be automaticallychanged to their default values according to the table below.
In PPP/HDLC encapsulation, changing the scrambling, automatically changes the “pos flag c2” to it’s
default according to the table below. In LEX encapsulation, changing the scrambling does not affect c2.
Command Modes Interface configuration mode (POS only)
Usage Guidelines This value is normally configured to match the setting on the peer Path Terminating Equipment (PTE).
Using the correct order of operations will avoid having the non-default settings overridden by the
encapsulation change. The recommended order follows:
• Set encap to PPP/HDLC
• Set scrambling (if a non-default setting is required)
• Set c2 (if a non-default setting is required)
Also note that the crc setting varies among different types of PTE. The default crc on the ML series card
is 32-bits, regardless of any other settings. In most circumstances, the default settings should be correct,
but users need to verify this with the user documentation for the PTE.
Examples
Gateway(config)#int pos0
Gateway(config-if)#pos flag c2 0x16
Related Commands pos trigger defects
pos report
Parameter Description
value C2 byte value
encap scrambling c2
LEX pos scramble-spe pos flag c2 0x01
PPP/HDLC no pos scramble-spe pos flag c2 0xCF
encap scrambling c2
PPP/HDLC pos scramble-spe pos flag c2 0xCF
PPP/HDLC no pos scramble-spe pos flag c2 0x16