04-11-2006 12:21 AM - edited 03-03-2019 12:22 PM
04-11-2006 12:31 AM
Hi Friend,
Null 0 is a black hole when routes checks this interface it will not find any route and will drop the traffic.
Lets take an example of a route
ip route x.x.x.x x.x.x.x null0
If this is the route and any packet matches that destination it will be dropped cause null 0 is not a valid interface.
Have a look at this link
http://www.cisco.com/univercd/cc/td/doc/product/software/iosxr3/int_c3/hc3loop.htm#wp1349080
HTH, if yes please rate the post.
Ankur
04-11-2006 01:27 AM
whats HTH?
04-11-2006 02:33 AM
Hi Friend,
HTH is hope that helps ;)
Regards,
Ankur
04-11-2006 09:53 AM
I'm having problems with 'route null0' statics being propagated through our MPLS / EIGRP / BGP network even when I do not have default-info-originate commands under the routing protocols
Cisco80211
Chris Serafin
IT Security / Cisco VoIP Engineer
04-11-2006 08:37 PM
Hi Friend,
Have you configured your EIGRP with summarization?
Regards,
Ankur
04-11-2006 09:06 PM
Hi,
Static route pointing to an interface (in your case, Null0) is considered directly connected network.
E.g. if you have "ip route 10.0.0.0 255.0.0.0 Null0", then you'll see the following line when you do "show ip route":
S 10.0.0.0/8 is directly connected, Null0
If the "network" command of your EIGRP covers the above network, it will be advertised as internal EIGRP route (AD=90).
Hope this helps.
Thank you.
B.Rgds,
Lim TS
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