You can insert linecards on the line of devices in a multinode HA setup without interrupting traffic.
You can use the new procedure to insert linecard when the setup has an encrypted inter-chassis link (ICL) or a non-encrypted ICL.
In case of an encrypted ICL setup, use the new statement set chassis high-availability hardware-upgrade on both nodes before you add line cards.
We've also updated the show chassis high availability information command output to include messages related to linecard installation.