Deciphering Mismatched Control Link Statistics During a Chassis Cluster ISSU
When using dual control links (supported on the SRX5000 and SRX3000 lines only), mismatched control link statistics might be reported with the show chassis cluster statistics and show chassis cluster control-plane statistics commands while you run an ISSU with nodes on devices running different releases. (ISSUs are available in Junos OS Release 9.6 and later and dual control links are available in Junos OS Release 10.0 and later.) For example, assume that one node on a device is running Junos OS Release 9.6 and another node on a device is running Junos OS Release 10.0. In this example, a mismatch might occur because the latter device is sending heartbeats on both control links, but the other device is receiving heartbeats only on one control link.
