[j-nsp] reusing loopback 0 ip address in vrfs

Steve Steiner ntwrkguru at gmail.com
Thu Nov 20 13:53:39 EST 2008

On Wed, Nov 19, 2008 at 2:44 PM, David Ball <davidtball at gmail.com> wrote:

>  I would expect it to work.  Never tried it, and dunno if it'd be
> common practice, but lo0 is largely just an interface, and just as
> have 2 customers come in across a tagged Gig trunk to be dumped into
> separate VRFs should work, so too should the same IP in diff logical
> units on lo0.  Only 1 way to find out for sure though! (commit check)
> David

You can do this, but you would want to ensure that each logical interface is
in a different instance.  For example, lo0.0 in the master instance, lo0.1
(assuming the same IP address) should be in a different instance.

> On 19/11/2008, cp <lists at pleasants.net> wrote:
> > Does anyone see a problem or have any experiences with using the same
> > loopback unit 0 IP addresses for other loopback unit in VRFs?  Is this a
> > common practice?  For example, loopback unit 0 is and
> > lives in inet.0.  loopback 425 is lives in a vrf.
> >
> >
> >
> > -Chip

That will absolutely work and is needed in certain corner cases.

More information about the juniper-nsp mailing list