[c-nsp] Strange Routing..

[Howard Leadmon]

 Pretty sure ip classless is the default, it's not in the config, but if you
type it in, it doesn't then show up in the config.   Also looking in show run
for the peering netblock only shows the interface ip config, and of course
all the various peers as well in the bgp config.   As I mentioned in an
earlier, maybe some anomaly or something, but when I realized I was missing a
prefix-list for someone, I reloaded my bgp configs from my backup config
file, and somehow when it recalculated the routes it all just started working
right.   So of course now looking at it, all output now looks perfect as
well.   I think I will just put this in my book of strange at the moment, and
am just glad all is back to normal and playing nice.

 As always, thanks for the input Gert..


---
Howard Leadmon 
PBW Communications, LLC
http://www.pbwcomm.com

> -----Original Message-----
> From: Gert Doering [mailto:gert at greenie.muc.de]
> Sent: Wednesday, November 23, 2016 2:33 AM
> To: Howard Leadmon <howard at leadmon.net>
> Cc: 'Cisco Network Service Providers' <cisco-nsp at puck.nether.net>
> Subject: Re: [c-nsp] Strange Routing..
> 
> Hi,
> 
> On Tue, Nov 22, 2016 at 07:15:14PM -0500, Howard Leadmon wrote:
> > #sho ip route 206.126.237.0
> >
> > Routing entry for 206.126.237.0/32, 1 known subnets
> >
> >   Attached (1 connections)
> >
> > L        206.126.237.136 is directly connected, Vlan99
> 
> This is funny.  What does "show running | inc 206.126.23" has to say about
> this?
> 
> What does "show ip cef 206.126.237.136" and "show ip cef 206.126.237.137"
> say about this?
> 
> Do you have "ip classless" configured?
> 
> (I'm not sure whether it is even possible to run "no ip classless"
> nowadays, but the "I have a host route out of a Class C, and the rest of
the
> Class C is null-routed" is what happens if you do that - yes,
> classful)
> 
> gert
> --
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> Gert Doering - Munich, Germany
gert at greenie.muc.de
> fax: +49-89-35655025
gert at net.informatik.tu-muenchen.de