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Upgrade ASA 5510 in Active/Standby

Posted on 2007-03-28
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Last Modified: 2012-08-14
I would like to know the best method for upgrading two Cisco ASA 5510's that are configured in active/standby mode.  I don't want to take both units down for the upgrade, but upgrade one while the other is still active.  I was thinking of the following:
1. Failover to Standby unit
2. Upgrade Primary unit's OS and ASDM
3. Once Primary is finished with upgrade, failback to primary and make it active
4. Then upgrade the Secondary unit

Does anyone see any problems with this method?  Has anyone ever performed this type of upgrade whle keeping one unit online/active?  Just want to minimize downtime.
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Question by:shaftkb
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Alan Huseyin Kayahan earned 1000 total points
ID: 18808493
         Your way looks ok. I used to upgrade both at the same time. I did not start ASAs in monitor mode. I deleted the files and copied from tftp as flash:image, and as asdm image then restarted both. They started OK.
          But your way is much secure. Because sometimes in some version upgrades, new version does not recognize some commands/configs set by old version, and configuration may get corrupt. If you do the version upgrade for one at first, you will be able to see failed commands, make some workaround and check the matching command for new version, and then apply.
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