Troubleshooting Tips
Event 8—Transfer Operational Parameters
After the DHCP and security operations are successful, the cable modem downloads operational parameters from a cable company’s TFTP server. These parameters are transferred via a
configuration file. The fieldshows the filename containing the transmission parameters.
508177.164 | CMAC_LOG_STATE_CHANGE | configuration_file_state |
508177.166 | CMAC_LOG_LOADING_CONFIG_FILE | platinum.cm |
508178.280 | CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE |
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Event 9—Perform Registration
The cable modem registers with the headend Cisco uBR7246. After the cable modem is initialized, authenticated, and configured, the cable modem is authorized to forward traffic into the cable network. A successful registration is indicated by the field CMAC_LOG_REGISTRATION_OK.
508178.300 | CMAC_LOG_STATE_CHANGE | registration_state |
508178.302 | CMAC_LOG_REG_REQ_MSG_QUEUED |
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508178.306 | CMAC_LOG_REG_REQ_TRANSMITTED |
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508178.310 | CMAC_LOG_REG_RSP_MSG_RCVD |
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508178.312 | CMAC_LOG_COS_ASSIGNED_SID | 1/2 |
508178.314 | CMAC_LOG_RNG_REQ_QUEUED | 2 |
508178.316 | CMAC_LOG_REGISTRATION_OK |
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Event 10—Comply with Baseline Privacy
Keys for baseline privacy are exchanged between the cable modem and the CMTS (the
Cisco uBR7246 cable router). During this event, a link level encryption is performed so that a user’s data cannot be “sniffed” by anyone else who is on the cable network.
Here is a trace that shows baseline privacy enabled. The key management protocol is responsible for exchanging 2 types of keys: KEKs and TEKs. The KEK (key exchange key, also referred to as the authorization key) is used by the headend CMTS to encrypt TEKs (traffic encryption keys) it sends to the cable modem. The TEKs are used to encrypt/decrypt the data. There is a TEK for each SID configured to use privacy.
851.088 | CMAC_LOG_STATE_CHANGE | establish_privacy_state |
851.094 | CMAC_LOG_PRIVACY_FSM_STATE_CHANGE | machine: KEK, event/state: |
EVENT_1_PROVISIONED/STATE_A_START, new state: STATE_B_AUTH_WAIT | ||
851.102 | CMAC_LOG_BPKM_REQ_TRANSMITTED |
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851.116 | CMAC_LOG_BPKM_RSP_MSG_RCVD |
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851.120 | CMAC_LOG_PRIVACY_FSM_STATE_CHANGE | machine: KEK, event/state: |
EVENT_3_AUTH_REPLY/STATE_B_AUTH_WAIT, new state: STATE_C_AUTHORIZED | ||
856.208 | CMAC_LOG_PRIVACY_FSM_STATE_CHANGE | machine: TEK, event/state: |
EVENT_2_AUTHORIZED/STATE_A_START, new state: STATE_B_OP_WAIT | ||
856.220 | CMAC_LOG_BPKM_REQ_TRANSMITTED |
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856.224 | CMAC_LOG_BPKM_RSP_MSG_RCVD |
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856.230 | CMAC_LOG_PRIVACY_FSM_STATE_CHANGE | machine: TEK, event/state: |
EVENT_8_KEY_REPLY/STATE_B_OP_WAIT, new state: STATE_D_OPERATIONAL | ||
856.326 | CMAC_LOG_PRIVACY_INSTALLED_KEY_FOR_SID | 2 |
856.330 | CMAC_LOG_PRIVACY_ESTABLISHED |
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