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Cisco Broadband Cable Command Reference Guide
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Chapter 5 Cisco CMTS Debugging Commands
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.
debug cable phs
no debug cable phs
Syntax Description This command has no arguments or keywords.
Command Modes Privileged EXEC
Command History
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 field: 00 00 00 00 00 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 field: 00 00 00 00 00 00 00 00
Add PHS rule 1 to CFR ID 1
Router#
Release Modification
12.1(4)CX This command was introduced.
12.2(4)BC1 Support was added to the Release 12.2 BC train.