On Fri, Nov 30, 2001 at 07:58:58PM -0500, Scott Morris wrote:
> Just FYI, I believe the phrase is "penultimate popping", which means the
> last one pops the tag.
"penultimate hop popping", or PHP, is the same as implicit-null.
Nothing to do with the HTML embedded scripting language of the same
name. :)
eric
>
> Scott
>
> -----Original Message-----
> From: Eric Osborne [mailto:eosborne@cisco.com]
> Sent: Friday, November 30, 2001 1:49 PM
> To: Giles Heron
> Cc: Eduardo Pannunzio; cisco-nsp@puck.nether.net
> Subject: Re: [nsp] A newbie question about MPLS
>
>
> On Fri, Nov 30, 2001 at 06:35:34PM +0000, Giles Heron wrote:
> > Eduardo Pannunzio wrote:
> > >
> > > Hi all,
> > >
> > > I'm trying to make a MPLS lab experience with 2 routers PEs (7513)and 4
> CEs (2514) but I believe is not possible to simulate a MPLS-VPN behavior
> without others routers like P (providers)between the PEs because a
> Penultime-Hop-popping . Am I correct?
> >
> > no - it is perfectly possible to have an MPLS VPN with no P devices
> > (i.e. the PE routers are adjacent.)
> >
>
> Agreed.
>
> > > Which is the IOS command that could change the rule (if exist)?
> >
> > I'm not sure you can control this in IOS?
> >
>
> You can make RSVP or LDP hand out explicit null rather than implicit,
> but there's functionally no difference.
>
>
>
>
> eric
>
> > but in any case it doesn't really matter. MPLS VPN will still work, but
> > the routers will never actually impose a tunnel label.
> >
> > Giles
> >
> > > Thanks in advanced
> > > Eduardo Pannunzio
> > > --
> > >
> > > Eduardo Pannunzio
> > > CCNA R&S / WS
> > >
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> >
> > --
> > =================================================================
> > Giles Heron Principal Network Architect PacketExchange Ltd.
> > ph: +44 7880 506185 "if you build it they will yawn"
> > =================================================================
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