03-29-2007 11:19 PM - edited 03-05-2019 03:11 PM
Hi,
I created a null0 interface in 3750, I can't see the interface in the "sh run" but I'm able to route RFC 1918 to it.
Is this normal?
TIA
Solved! Go to Solution.
03-30-2007 12:08 AM
Hi
I believe it is. I have just tried creating a null0 interface in our lab on
3550
3560
6509
2621
7206VXR
None of them showed up in config. i believe this is because it is a pseudo-interface similar to /dev/null in unix. You can always add routes that point to Null0 and the IOS will do the right thing and blackhole them.
You can also do a limited amount of config on the null0 interface but it won't take an ip address etc.
HTH
Jon
03-30-2007 12:08 AM
Hi
I believe it is. I have just tried creating a null0 interface in our lab on
3550
3560
6509
2621
7206VXR
None of them showed up in config. i believe this is because it is a pseudo-interface similar to /dev/null in unix. You can always add routes that point to Null0 and the IOS will do the right thing and blackhole them.
You can also do a limited amount of config on the null0 interface but it won't take an ip address etc.
HTH
Jon
03-30-2007 12:12 AM
Hi Jon,
Thanks for confirmation.
In 7500 series routers with IOS 12.1, the null0 intrerface is visible in the config.
Regards,
Dandy
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