[nsp] Enquiry on MPLS across Public Network

[Harold Ritter]

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."