Problem Description

When a bureau wipes the library and downloads the data configuration of OSN7500 equipment, the EGS4 board of the network element reports LINK_ERR alarm after the successful issuance and triggers the DLAG inversion at the same time , and the EGS4 board is configured with the DLAG protection mode, the host version is 5.21.19.31SPH002, and the network management version is T2000V2R7CO3SPC009.

Alarm message

LINK_ERR

Processing

After setting the port working mode to self-negotiation and then changing it to 1000mfull on the network administrator, the alarm disappears and the problem is solved.

Root cause

The command sequence for the network element to download the data of the EGS4 board configured with the DLAG protection mode is:

A. For DLAG spare board 1 ) set the logical port type 2 ) set the port working mode;

B. For DLAG motherboard 1 ) Set the logical port type 2 ) Set the port operating mode 3 ) Set the logical port type.

When setting the logical port type for the second time on the EGS4 single board motherboard configured for DLAG protection, the host sets the working mode to the default self-negotiation while the working mode of the docking device is 1000mfull, which causes the single board to report the LINK_ERR alarm and triggers the DLAG inversion due to the inconsistency of the working mode.

Recommendations and Summary

Download the data to configure DLAG protection for the EGS4 single board, the host to the motherboard one more time to set the logical port type, configure the working mode to self-negotiation. R & D has not yet come out with a new version to completely solve the problem, in the configuration of the download data, for the configuration of the DLAG protection of the single board, can be solved by the following ways to circumvent: if the current work in the motherboard to delete the DLAG protection first; if the current work in the spare board, inverted back to the motherboard, and then delete the DLAG protection.