[c-nsp] IP unnumbered vlan subinterfaces question

[Michael Ulitskiy]

It wouldn't let me to do that. It would say "overlapping subnet"

Michael

On Monday 03 August 2009 05:13:20 pm Tomas Daniska wrote:
> Michail, 
> 
> you can use a different 10.10.10.x IP for f0/0.1 and have 10.10.10.1/32
> on the loopback if this helps you. Proxy-ARP might be needed as well.
> 
> 
> --
> 
> deejay
> 
> 
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of Michael Ulitskiy
> > Sent: Monday, August 03, 2009 6:23 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: Re: [c-nsp] IP unnumbered vlan subinterfaces question
> > 
> > It's not about saving a /32.
> > This is a CPE device and I was just trying to save myself
> > administrative burden of maintaining another per-customer  static ip
> > assignment.
> > I don't need dynamic routing protocol to run on those interfaces, but
> > thanks for pointing it out anyway.
> > Ok, if I have to do it then I have to do it.
> > Thanks everybody,
> > 
> > Michael
> > 
> > On Monday 03 August 2009 11:42:09 am Rodney Dunn wrote:
> > > Don't do it. It's a hack and there are other forwarding plane things
> > > that don't like it. Read as..it may or may not always work.
> > >
> > > Burn another /32 for your loopback.
> > >
> > > Rodney
> > >
> > >
> > >
> > > Aaron wrote:
> > > > Loopback interfaces do not go down, so I'm not sure what benefit
> > you are
> > > > getting besides the ability to blackhole the 10.10.10.0/24 if the
> > ethernet
> > > > goes down.
> > > >
> > > > On Mon, Aug 3, 2009 at 11:09, Michael Ulitskiy
> > <mulitskiy at acedsl.com> wrote:
> > > >
> > > >> Hello,
> > > >>
> > > >> Guys, are there any drawbacks of doing the following:
> > > >>
> > > >> interface Lo0
> > > >>  ip address 10.10.10.1 255.255.255.0
> > > >> !
> > > >> interface FastEthernet0/0.1
> > > >>  encapsulation dot1q 1 native
> > > >>  ip unnumbered Lo0
> > > >> !
> > > >> ip route 10.10.10.0 255.255.255.0 FastEthernet0/0.1
> > > >> !
> > > >>
> > > >> as opposed to having ip address configured directly on the
> > interface as
> > > >> usual?
> > > >> I need that ip address to stay always up regardless of Fa0/0
> > state, 'cause
> > > >> it's used for other services that should stay up
> > > >> and I'd prefer to avoid assigning another ip address exclusively
> > for
> > > >> loopback use.
> > > >> It seems to work in my lab, but I thought I'd better ask...
> > > >>
> > > >> Thanks,
> > > >> Michael
> > > >> _______________________________________________
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> > > >>
> > > > _______________________________________________
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> > >
> > 
> > 
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> > 
> > 
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>  
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