IP SUBNET-ZERO

Answered Question
Jul 26th, 2007
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Hi,


I'm using the BUNDLE1841 with IOS ADVANCED SERVICES. I am having problems as ip subnet-zero command.

The router accept the command, but after to save the configurations, the show running, i don't see the ip subnet-zero on!

What it can be happening?


Thanks


Peterson

Correct Answer by Richard Burts about 9 years 10 months ago

Peterson


Sunday is quite correct. In very old versions of IOS the default was no ip subnet-zero. The default changed a LONG time ago and in all versions of code which run on the 1841 the default is to enable subnet zero.


When Cisco changes a default in the code they are pretty good about showing the value in the show running-config for quite a while. And the command has been displayed in code for a long time. In very recent versions of code several of theses defaults are no longer showing up, including subnet-zero. But the behavior is still enabled. Sundar's advice about doing no ip subnet-zero is a good way to check it out.


HTH


Rick

Correct Answer by sundar.palaniappan about 9 years 10 months ago

Peterson,


IOS doesn't display most default configuration. 'ip subnet-zero' is a very likely a default configuration in the IOS version you are using. The one way to confirm that would be if you configure 'no ip subnet-zero' the command would show up in the running configuration.


HTH


Sundar

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Correct Answer
sundar.palaniappan Thu, 07/26/2007 - 13:00
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Peterson,


IOS doesn't display most default configuration. 'ip subnet-zero' is a very likely a default configuration in the IOS version you are using. The one way to confirm that would be if you configure 'no ip subnet-zero' the command would show up in the running configuration.


HTH


Sundar

Correct Answer
Richard Burts Thu, 07/26/2007 - 17:08
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Peterson


Sunday is quite correct. In very old versions of IOS the default was no ip subnet-zero. The default changed a LONG time ago and in all versions of code which run on the 1841 the default is to enable subnet zero.


When Cisco changes a default in the code they are pretty good about showing the value in the show running-config for quite a while. And the command has been displayed in code for a long time. In very recent versions of code several of theses defaults are no longer showing up, including subnet-zero. But the behavior is still enabled. Sundar's advice about doing no ip subnet-zero is a good way to check it out.


HTH


Rick

Richard Burts Sat, 07/28/2007 - 18:29
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Peterson


Thanks for using the rating system to indicate that your question was resolved (and thanks for the rating). It makes the forum more useful when people can read a question and can know that they will read an answer that resolved the question. I encourage you to continue your participation in the forum.


HTH


Rick

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