From: keith tokash (ktokash@hotmail.com)
Date: Thu Dec 20 2007 - 17:56:50 ART
Yeah that helps a lot actually. I've used the "default interface" command,
but didn't realize Cisco made the default reset so ubiquitous. So I learned
something new, and all it took was a little egg on my face. Fair enough. :)
With a few exceptions, secrecy is deeply incompatible with democracy and with
science.
--Carl Sagan
> Date: Thu, 20 Dec 2007 21:34:18 +0100
> From: christian@zengl.net
> To: ktokash@hotmail.com
> CC: ccielab@groupstudy.com
> Subject: Re: RIP passive interface command not showing up in the config
>
> Hi,
>
> * keith tokash wrote:
> > I don't know why I went with "default passive-int default" the first
time;
> > I've never used that command before. Now I'm curious as to what it
actually
> > accomplishes.
>
> 'default' in front of most of the config commands resets the command to
> its factory default setting (what is listed under the 'default' section
> at each command in the command reference, or simplified to what gets set
> when the router starts without a startup config). For
>
> default passive-interface default
>
> you are telling the router to revert to the default setting for
> passive-interface, which is having all interfaces sending out routing
> informations - effectively also deleting all 'no passive-i <interface>'
> statements ('no passive-i default' does the same, afaik).
>
> After your sequence of commands, nothing showed up in the running
> config, since the
>
> no passive-interface Ethernet0/0
>
> was not preceded by the correct 'passive-i default'; the command had no
> effect, because all interfaces were already not passive.
>
> The default command can be very handy and it can be a better solution
> when you want to start over with a complete config section or dont know
> the defaults for a specific command, for example
>
> (config)# default interface Fa0/0
>
> resets all interface level settings under Fa0/0 to default
>
> (config)# default logging trap
>
> resets logging level for trap logging to default (5)
>
> I got very used to the first example in real life on IOS switches.
>
> Beware of some side-effects, like
>
> (IOS 12.3, booted with no startup config)
> Router(config)#do sh run | i subne
> ip subnet-zero
> Router(config)#default ip subnet-zero
> Router(config)#do sh run | i subne
> no ip subnet-zero
>
> Which is interesting - since IOS 12.0 this is a config default and even
> listed as such (12.4 doesnt even list it anymore in a fresh config), but
> at least on my version (12.3.20), it gets disabled.
>
> Hope this helps,
>
>
> Christian
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