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Chapter 5
Cisco CMTS Debugging Commands
Examples
The following examples show typical output for the debug cable dcc command. The following example
shows the debug output from a DCC-REQ message that instructs the CM to change its upstream channel
to channel 1, using the default initialization technique (option 0, the CM is to reinitialize its MAC layer,
requiring a complete reregistration):
Router# debug cable int c3/0
Router# debug cable dcc
CMTS DCC encodings debugging is on
Router#
00:02:57: Found DCC TLV
00:02:57:
00:02:57: received a DCC_RSP.
The following example shows the debug output from a DCC-REQ message that instructs the CM to
change its upstream channel to channel 1, using initialization technique 4 (the CM is to continue its
normal operations after synchronizing to the new channel).
0:04:29: Found DCC TLV
00:04:29:
00:04:29: Found DCC TLV
00:04:29:
00:04:29: received a DCC_RSP.
00:04:29: CM new state = 15
00:04:30: DCC-RSP-NEW-TIMEOUT: CmMac->00ac.0000.0070 OrgId->32770
00:04:30: DCC-RSP-ARRIVE is lost.
00:04:30: received a DCC_RSP.
00:04:30: ERROR: Received DCC-RSP-ARRIVE w/o DCC-REQ.
00:04:30: DCC-ACK Message Contents:
00:04:30: 0x0000: C2 00 00 1A 00 00 00 30 EB 15 2E 97 00 AC 00 00
00:04:30: 0x0010: 00 70 00 08 00 00 03 02 19 00 80 02
00:04:30: DCC-ACK-SENT: CM->0030.eb15.2e97 TranscId->32770
The following example shows the debug output from a DCC-REQ message that instructs the CM to
change its upstream channel to channel 2, using initialization technique 4, and substituting a new service
flow ID (SFID) of 160 for the current SFID of 14.
00:05:19: Found DCC TLV
00:05:19:
00:05:19: Found DCC TLV
00:05:19:
00:05:19: Found DCC TLV
00:05:19:
00:05:19: received a DCC_RSP.
00:05:19: CM new state = 15
00:05:20: DCC-RSP-NEW-TIMEOUT: CmMac->00ac.0000.0070 OrgId->32771
00:05:20: DCC-RSP-ARRIVE is lost.
00:05:20: received a DCC_RSP.
00:05:20: ERROR: Received DCC-RSP-ARRIVE w/o DCC-REQ.
00:05:20: DCC-ACK Message Contents:
00:05:20: 0x0000: C2 00 00 1A 00 00 00 30 EB 15 2E 97 00 AC 00 00
00:05:20: 0x0010: 00 70 00 08 00 00 03 02 19 00 80 03
00:05:20: DCC-ACK-SENT: CM->0030.eb15.2e97 TranscId->32771
The following example shows the debug output from a DCC-REQ message that specifies an upstream
channel with a frequency that is not a multiple of 62,500 Hz, which is required by the DOCSIS
specification:
00:07:28: Found DCC TLV
00:07:28:
00:07:28: Found DCC TLV
00:07:28:
00:07:28: Found DCC TLV
00:07:28:
OL-1581-08
US Channel ID 1
upstream = 1.
US Channel ID 1
Init Tech 4
upstream = 1.
upstream = 0.
US Channel ID 2
Init Tech 4
SFID Substitute old 14 new 160
upstream = 0.
upstream = 1.
US Channel ID 2
Init Tech 4
ERROR: DS frequency not a multiple of 62500Hz.
Cisco Broadband Cable Command Reference Guide
debug cable dcc
5-17
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