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Exec-timeout doesn't seem to work

I've been having a devil of a time getting exec-timeout to clear idle vty/ssh sessions. This investigation started when we were rolling out new Catalyst 4507R+E switches with Sup7L-E's under IOS XE 03.04.02.SG (what they shipped from the factory with.) Idle SSH sessions on the vty lines were not being cleared, despite the config being:

line vty 0 4
 access-class VTY_ACL in
 exec-timeout 30 0
 logging synchronous
 length 0
 transport input ssh

So I opened a TAC case, and eventually they referred to bug CSCug31122. This wasn't terribly satisfying, as we are not talking about new or revolutionary functionality, and a general distribution release on a mature platform. Clearing an idle session does not require the most sophisticated programmer at Cisco. But this led me to do more tests, and I have yet to find a hardware/IOS combination where this works correctly. So far I have failures for:

4507R+E/Sup7L-E/IOS XE 03.04.02.SG, both vty and console lines

3560/12.2(40)SE, vty lines with ssh

3750/12.2(44)SE6, vty lines with both telnet and ssh


This seems more than coincidence. Is there something I am missing, or is this an unusually complicated programming issue?