Step 4—Interpret the MAC Log File and Take Action
Event 5—Establish IP Connectivity
After ranging is complete, the cable interface on the cable access router is UP. Now the
Cisco uBR924 accesses a remote DHCP server to get an IP address. The DHCP request also includes the name of a file that contains additional configuration parameters, the TFTP server’s address and the Time of Day (TOD) server’s address.
The CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS field indicates the IP address assigned from the DHCP server to the Cisco uBR924 interface. The CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS field marks the TFTP server’s address. The CMAC_LOG_DHCP_TOD_SERVER_ADDRESS field indicates the time of day
server’s address. The CMAC_LOG_DHCP_CONFIG_FILE_NAME | field shows the filename containing the | |
transmission parameters. The CMAC_LOG_DHCP_COMPLETE | field shows that the IP connectivity was | |
successful. |
|
|
508175.968 | CMAC_LOG_STATE_CHANGE | dhcp_state |
508176.982 | CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS | 188.188.1.62 |
508176.984 | CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS | 4.0.0.1 |
508176.986 | CMAC_LOG_DHCP_TOD_SERVER_ADDRESS | 4.0.0.32 |
508176.988 | CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS |
|
508176.988 | CMAC_LOG_DHCP_TZ_OFFSET | 360 |
508176.990 | CMAC_LOG_DHCP_CONFIG_FILE_NAME | platinum.cm |
508176.992 | CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR | |
508176.996 | CMAC_LOG_DHCP_COMPLETE |
|
Event 6—Establish the Time of Day
The Cisco uBR924 cable access router accesses the Time of Day server for the current date and time,
which is used to create time stamps for logged events. Thefield indicates a successful time of day sequence.
508177.120 | CMAC_LOG_STATE_CHANGE | establish_tod_state |
508177.126 | CMAC_LOG_TOD_REQUEST_SENT |
|
508177.154 | CMAC_LOG_TOD_REPLY_RECEIVED | 3107617539 |
508177.158 | CMAC_LOG_TOD_COMPLETE |
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Event 7—Establish Security
The Cisco uBR924 establishes a security association. The security_association_state is normally bypassed since “full security” as defined by DOCSIS is not supported.
Note “Full security” was a request made by MSOs for a very strong authorization and authentication check by the CMTS. This request has not been granted by cable modem manufacturers. The Cisco uBR924 supports DOCSIS baseline privacy beginning with Cisco IOS Release 12.0(5)T, which protects user’s data from being “sniffed” on the cable network. For information on baseline privacy, refer to “Event
508177.160 | CMAC_LOG_STATE_CHANGE | security_association_state |
508177.162 | CMAC_LOG_SECURITY_BYPASSED |
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16Cisco IOS Release 12.0(5)T
