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When did subnet-zero become a hidden command?

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.

3 REPLIES
Hall of Fame Super Silver

Re: When did subnet-zero become a hidden command?

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):

ip-classless:

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.

Cisco Employee

Re: When did subnet-zero become a hidden command?

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.

New Member

Re: When did subnet-zero become a hidden command?

Thank you. That is exactly what I was looking for.

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