What is NULL0??
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February 06, 2012, 02:37:56 PM *
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RoUtermOnKey Discussion Forums > General Routing & Switching > Basic R&S Questions > What is NULL0??
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carterhigginz
Full Member
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Posts: 105


More brains per square inch!
« on: May 16, 2008, 01:37:33 PM »
I've got this crazy static route!!  Looks like this ....

msfc-b#show ip route | include Null
S       63.90.10.192/26 is directly connected, Null0

All I can tell is that it appears to be a black hole.

Can someone tell me what this is??

TIA
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notoriousBG
Global Moderator
Sr. Member
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Posts: 308


No! Monkey
« Reply #1 on: May 19, 2008, 09:01:12 PM »
Hey Higginz!

Yep, you got it, null0 can be a dead end, same concept is /dev/null Smiley The reason you would route to null0 is to cause the router on which that static route is implemented on to be the source for that route as it's distributed into your dynamic routing process.

Wasn't msfc-b on one of your core 6509's you wrote about before? Cause the IP you mentioned is public IP?

There are some other uses for using null0 such as black holing a route.  Could be used in conjunction with policy routing... so what's up? is something broken and you suspect this static route is the culprit?

Regards,
Barney
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