Release Notes

Software Upgrades 13
Table 2 describes the backoff delay times for each retry:
Once the Server Load Balancer and Server Load Balancer Plus have
backed off the timeout, it will never go back down again. For example, if
a packet is dropped it may go from a time out of 8 to 16 seconds and
remains at a 16 second timeout as long as packets continue to be
received. The retry count resets to indicate an initial attempt. The upgrade
terminates on its own, in the worse case 6 minutes if no TFTP server is
responding.
If an upgrade is initiated and then subsequently canceled, you must wait
at least 1 minute before initiating a subsequent upgrade.
Disable Attack Filters To ensure that the software upgrade sequence completes successfully, all
Attack Filters should be disabled for the duration of the upgrade. The
Attack Filters should be re-enabled once the upgrade completes.
Restart the Browser The browser must be restarted after an upgrade is performed.
Ta b l e 2 Retry and Backoff Time
Retry Backoff Delay
Initial Attempt N/A
First 8 seconds
Second 16 seconds
Third 32 seconds
Fourth 1 minute
Fifth 1 minute
Final 1 minute