[c-nsp] IP unnumbered vlan subinterfaces question

[Michael Ulitskiy]

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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