[nsp] Enquiry on MPLS across Public Network

[John Pang]

Hi Harold,

Many thanks for your time and invaluable advice!

--- Harold Ritter <hritter at cisco.com> wrote:
> John,
> 
> The issue with the additional overhead is that it
> can cause fragmentation. 
> One way to prevent packet fragmentation is to use
> Path MTU Discovery with TCP.
> 
> At 05:37 PM 2/2/2004 -0800, John Pang wrote:
> >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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> >_______________________________________________
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> > > > >
> > >
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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."
> > > > >
> > > >
> > > >
> > > >__________________________________
> > > >Do you Yahoo!?
> > > >Yahoo! SiteBuilder - Free web site building
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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."
> > >
> >
> >
> >__________________________________
> >Do you Yahoo!?
> >Yahoo! SiteBuilder - Free web site building tool.
> Try it!
> >http://webhosting.yahoo.com/ps/sb/
> 
> 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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