That's correct. This switch 2950 is no longer supported.
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End of Software Maintenance Releases Date: SW
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The last date that Ciso Engineering may release any final software maintenance releases or bug fixes. After this date, Cisco Engineering will no longer develop, repair, maintain, or test the product software.
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October 21, 2009
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http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2950-series-switches/prod_end-of-life_notice0900aecd806ea1da.html
However, this appears to be bug try different IOS codes. See below for similar bug affecting different platform.
Cisco Bug: CSCeb43452 - Interrupt level stacks become depleted on C3745
Last Modified Jan 24, 2017
Product Cisco 3600 Series Multiservice Platforms
Known Affected Releases 12.2(15)T2 12.3
Symptoms: A Cisco 3745 that runs Cisco IOS Release 12.2(15)T2 or Release 12.3
may deplete the interrupt level stacks and report the following error messages
in the syslog:
%SYS-6-STACKLOW: Stack for level Network interfaces running low, 0/9000
%SYS-6-STACKLOW: Stack for level DMA/Timer Interrupt running low, 0/9000
%SYS-6-STACKLOW: Stack for level PA Management Int Handler running low, 0/9000
%SYS-6-STACKLOW: Stack for level Console Uart running low, 0/9000
Interrupt level stacks:
Level Called Unused/Size Name
1 22321736 0/9000 Network interfaces
2 830757 0/9000 DMA/Timer Interrupt
3 453468 0/9000 PA Management Int Handler
4 5100 0/9000 Console Uart
5 0 7656/9000 External Interrupt
7 113396404 8600/9000 NMI Interrupt Handler
Conditions: This symptom is observed when the BSTUN configuration is being
updated.
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