Do not use this message while the CSP is passing data. Doing so could result in data lossYou are here: CSP Developer’s Guide: Overview > 3 Getting Started > Robust Ethernet Redundancy
Alarm
When the Ethernet ports are in redundant mode and an Ethernet switchover occurs, the CSP sends the Ethernet Switchover Occurred alarm (Card Alarm 0x4F) to the host. Refer to the Alarm (0x00B9) Message in the API Reference.
Unsolicited Reports
The CSP also send the following messages without the host requesting them:
• The active Ethernet interface is reported in every AB Poll. Refer the Card Status bit mask in the Poll (0x00AB) message in the API Reference.
• Whenever the CSP issues a Card Status Report for the Matrix Controller I/O, the report contains an indication of the active interface and each interface’s link detect state.
Selecting Active Ethernet interface
Use the IP Address Configuration message to select the active Ethernet interface. Refer to this message in the API Reference.
Do not use this message while the CSP is passing data. Doing so could result in data loss
Querying
Use the IP Address Configure Query (0x00E6) message to query which Ethernet Interface is active.
Refer to the CSA User’s Guide for instructions on Querying and Switching Over Ethernet Redundancy.