[SYN] [SYN-ACK] [ACK]…General Network Error! Check your network documentation.
generalnetworkerror.com is dedicated to dispelling the myth that the network is usually the source of unknown and errant behavior in applications. This is rarely the case in a well-designed network. The difference of application to network errors is usually orders of magnitude, and geometrically increases with load.
In order of preference/priority, what factors do you consider in driving an upgrade (or downgrade) with Cisco IOS? If no compelling factors exist, how long would you allow a particular version of IOS to stay running? I’ve seen some switches with uptimes > 5 years. And when upgrading, how is the specific IOS release identified as the upgrade target?
In order of preference/priority, best practice tends to dictate an upgrade based on these factors:
- Vulnerabilities, vulnerabilities, vulnerabilities!
- Attaining new features not currently available— new cards/modules have a “first supported in” IOS version which could be higher than what you have running
- Migrating away from retired release trains
- Matching versions on more recently deployed and similar hardware
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