[c-nsp] IP unnumbered vlan subinterfaces question

[Tomas Daniska]

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
> > >> _______________________________________________
> > >> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> > >> https://puck.nether.net/mailman/listinfo/cisco-nsp
> > >> archive at http://puck.nether.net/pipermail/cisco-nsp/
> > >>
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> >
> 
> 
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> 
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