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debug cable phs
debug cable phs
To display the activities of the payload header suppression and restoration (PHS) driver, use the debug
cable phs command in privileged EXEC mode. The no form of this command disables debugging
output.
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Release
12.1(4)CX
12.2(4)BC1
Usage Guidelines
Do not use this command when you have a large number of active CMs on your network, because it could
generate a huge amount of output to the console port.
This command displays the output for both the upstream and downstream drivers. The upstream receive
driver restores headers that have been suppressed by CMs, and the downstream driver suppresses specific
fields in packet header before forwarding a frame to the CM.
Examples
The following example shows typical output from PHS debugging:
Router# debug cable phs
CMTS payload header suppression debugging is on
00:02:55: New PHS rule: 1 (SFID: 9)
size : 34
mask : 00 00 00 03 FC 00 00 00
Add PHS rule 1 to CFR ID 1
00:02:57: New PHS rule: 1 (SFID: 11)
size : 34
mask : 00 00 00 03 FC 00 00 00
Add PHS rule 1 to CFR ID 1
Router#
Cisco Broadband Cable Command Reference Guide
5-56
debug cable phs
no debug cable phs
Modification
This command was introduced.
Support was added to the Release 12.2 BC train.
field: 00 00 00 00 00 00 00 00
field: 00 00 00 00 00 00 00 00
Chapter 5
Cisco CMTS Debugging Commands
OL-1581-08
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