An ET1 board is added in station #9-39 (Metro1000). This station is located on an unprotected chain. Station #9-31 is the upstream station and station #9-45 is the downstream station. Both stations use the Metro1000. The NE software of station #9-39 does not support ET1 boards and thus needs to be downgraded.
The downgrade steps are as follows:
1): Run the :erase; command to erase the NE software.
2) Run the :e-all; command to erase the NE software, DRDB, FDB0, and FDB1 in extended BIOS state.
3) Run the :e-biosfpga; command to erase the BIOS and the FPGA.
4) Load the extended BIOS of the 436 version, including the OHP and the STG_FPGA.
5) Load the NE software.
6) Issue configuration data again from the NMS to the gateway NE.
Remotely downgrade the NE software of station #9-39 through the NMS. Log in through Navigator to station #9-39. Enter the :erase; command to erase the NE software. The NE automatically restarts. Log in to the NE again. The login fails. Log in to other NEs to query the ECC information. NE #9-39 is not found.
1) Log in to the upstream station #9-31 and run the ecc-get-sccinfo command. The ID of station #9-39 is displayed as #9-38 in the NMS. Therefore, the NE ID displayed in the NMS is inconsistent with the actual NE ID.
2) Log in to station #9-38. The message ““BIOS is running, please download nesoft” is displayed. Maybe the NE ID is changed to #9-38 after the SCC is reset.
3) Arrive at the site to check the DIP switch on the Metro 1000. The DIP switch settings indicate #9-38. Load the NE software on site, change the NE ID to #9-39, and then issue the configuration data. The problem is solved. Alternatively, you can remotely load the NE software. In this case, the NE software is loaded on site to ensure that the right NE is operated so as to avoid other faults.
4) The cause of the problem is that the NE ID was initially set to #9-39 through the DIP switch on the Metro 1000 but later someone changed the NE ID through the DIP switch settings to #9-38 but did not reset the SCC for the new NE ID to take effect. After the NE software is erased, the SCC automatically resets and then the NE ID changes to #9-38. As a result, the fault occurs.
1) The extended BIOS provides weak ECC capability after the NE software is erased. Therefore, you cannot log in to the NE.
2) The NE ID changes after the NE software is erased and the NE is reset.