[nsp] MPLS: a couple of questions

[Harold Ritter]

Pierfrancesco,

At 10:35 AM 10/23/2002 +0200, Pierfrancesco Caci wrote:

>Hello,
>I would like to know if there are limitations for MPLS and OSPF: do
>all routers that have to share a vpn need to be on the same OSPF area?

There is no need for a single area if you use LDP or TDP to signal the LSPs 
between the PE routers. If you use MPLS TE instead, you have to make sure 
to run a level of code that supports inter-area tunnels if you don't want 
the one area restriction to apply.

See the following URL for more information on MPLS-TE inter-area tunnels:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22/fs_areat.htm


>Is it possible to have MPLS over MPLS? In other words, can a customer
>of mine that sees his routers connected with VPNs (without seeing my
>backbone) in turn sell VPNs to _his_ customers ?

Yes, it is possible. See the following URL to get more information on 
Carrier Supporting Carrier:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22/csc22.htm



>(cust_of_cust)--(my customer)--(my backbone)--(my customer)--(cust_of_cust)
>(    pop A   )  (   pop A   )                 (   pop B   )  (   pop B    )
>
>The general idea here is that "my customer" is a separate branch of
>our company and we (the backbone) don't want them to mess either with
>our OSPF area 0 or with our existing mpls configuration.
>
>Thanks
>
>Pf
>
>
>
>--
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>  Pierfrancesco Caci |            System Administrator @ seabone.net
>  p.caci@seabone.net |     Telecom Italia S.p.A. - International Wholesale 
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Harold Ritter, CCIE 4168
Advanced Network Services - ISP East
Cisco Systems
300 Apollo Drive
Chelmsford, MA 01824 USA
Phone: 978 497 3129
Fax: 978 497 3129
Cisco Systems- "Empowering the Internet Generation."