[nsp] Enquiry on MPLS across Public Network

[John Pang]

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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