Go CCIE Go!! - A Cisco Certified Internetwork Expert

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 ‘ 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