60.1 Unexplained Phenomenon Cisco Forum FAQ

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All FAQs » Cisco Forum FAQ » 60.1 Unexplained Phenomenon
FAQ Revisions	Editors: skj , Covenant , aryoba , Phraxos Last modified on 2009-11-20 08:39:48

60.1 Unexplained Phenomenon ·Frame Relay ·Router IOS image performance and reliability
Frame Relay (#13978)
Following is the "weird situation" relating to Frame Relay »One app didn't work over Frame Relay; worked over ISDN feedback form by aryoba
Router IOS image performance and reliability (#14542)
It is "unwritten rule" in Cisco IOS router network management that older IOS version such as 12.3.x is considered more reliable than the newer IOS 12.4.x. In addition, sometime upgrading IOS image version solves weird problems. Check out following thread for illustration. Downgrade from 12.4.x to 12.3.x »Cisco 2621XM, Poor Performance with WIC-1ADSL, IOS 12.4 Upgrade from older 12.3.x to newer 12.3.x »[Config] Cisco 2801 + WIC-1T problem Check out this FAQ for possible bug within the IOS image that might explain the phenomenon. »Cisco Forum FAQ »Where can I find Field notices to confirm to during troubleshooting? feedback form by aryoba last modified: 2009-03-15 07:31:31


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