When did subnet-zero become a hidden command?

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Apr 20th, 2009
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What IOS release introduced "ip subnet-zero" and "ip classless" as hidden commands?

This seems to have started sometime around 12.4(10) and 12.4(11)T1.

We check to see if both of these commands are present for config compliance. Routers running recent images fail the compliance check. I would like to write a rule checking for the image version, before stating the device is not in compliance.

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Marvin Rhoads Mon, 04/20/2009 - 08:30
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According to the IOS IP Command Reference for IOS 12.3, (http://www.cisco.com/en/US/docs/ios/12_3/ipaddr/command/reference/ipras_r.html):


10.0 This command was introduced.

11.3 The default behavior changed from disabled to enabled.

ip subnet-zero:

10.0 This command was introduced.

Joe Clarke Mon, 04/20/2009 - 09:43
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It looks like these commands are no longer written to the running config as of 12.4(5)and 12.4(5)T per CSCsa75635.

brihess Mon, 04/20/2009 - 11:02
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Thank you. That is exactly what I was looking for.


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