[nsp] Enquiry on MPLS across Public Network

[John Pang]

Hi Harold,

Thanks for the invaluable info. In this case, is there
anyway to "overcome" potential problems caused by the
24 + 4 = 28 bytes of overhead? Or will these 28bytes
not cause too much of a problem?

Best regards,

--- Harold Ritter <hritter at cisco.com> wrote:
> John,
> 
> The same thing applies here, except that on top of
> the 24 bytes of overhead 
> for GRE you have to factor in the MPLS overhead,
> which is 4 bytes per label 
> in the stack.
> 
> At 10:36 AM 1/29/2004 -0800, John Pang wrote:
> >Hi Harold,
> >
> >Thanks for the suggestion. Do you happen to know
> where
> >I can find out more about how this can be done? Any
> >docs to read up more about it?
> >
> >One thing I understand about GRE is that it takes
> up
> >24bytes of the MTU and hence may result in
> >fragmentation problems.
> >
> >Will running MPLS over GRE be affected by this or
> will
> >it overcome this problem?
> >
> >Thanks,
> >
> >--- Harold Ritter <hritter at cisco.com> wrote:
> > > John,
> > >
> > > At 09:05 PM 1/27/2004 -0800, John Pang wrote:
> > > >Hi all,
> > > >
> > > >I am an ultra newbie on MPLS and currently
> reading
> > > up
> > > >some Cisco docs on it.
> > > >
> > > >I amd wondering if it is possible to do an MPLS
> VPN
> > > or
> > > >MPLS Traffic Engineering Tunnel across a Public
> > > >Network (such as the Internet) to join one or
> more
> > > >remote sites together instead of other
> technologies
> > > >such as GRE?
> > > >
> > > > >From the docs which I read, it seems that for
> any
> > > form
> > > >of MPLS to work, the provider (P) routers need
> to
> > > be
> > > >configured to support MPLS but in the case of
> the
> > > >Internet being the public network, it may not
> > > >necessarily have MPLS enabled on the various
> ISPs
> > > >routers.
> > >
> > > It is possible to run MPLS over a non-MPLS
> enabled
> > > network such as the
> > > Internet but it requires using GRE to carry MPLS
> > > frames.
> > >
> > >
> > > >Have anyone tried this before and or can anyone
> > > help
> > > >shed light on this?
> > > >
> > > >Many thanks for your time and best regards,
> > > >
> > > >__________________________________
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> > >
> > > Harold Ritter, CCIE 4168 (R&S / SP)
> > > Advanced Services - SP East
> > > Cisco Systems
> > > 1414 Massachusetts Avenue
> > > Boxborough, MA 01719 USA
> > > Phone: 978 936 1431
> > > Cisco Systems- "Empowering the Internet
> Generation."
> > >
> >
> >
> >__________________________________
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> 
> Harold Ritter, CCIE 4168 (R&S / SP)
> Advanced Services - SP East
> Cisco Systems
> 1414 Massachusetts Avenue
> Boxborough, MA 01719 USA
> Phone: 978 936 1431
> Cisco Systems- "Empowering the Internet Generation."
> 


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