Pls tell me usefull URLs for MPLS VPN different scenario .....

pls tell me usefull URLs for MPLS VPN different scenarios. presently i am doing research on this topic so pls tell me useful URLs so that i can get help.

Here's a good start: http://www.cisco.com/go/mpls
Hope that helps - pls rate the post if it does.
Paresh

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    What are the solutions of Central site Internet connectivity for a MPLS VPN user, and what is the best practice?

    Hello,
    Since you mentioned that Internet Access should be through a central site, it is clear that all customer sites (except the central) will somehow have a default (static/dynamic) to reach the central site via the normal VPN path for unknown destinations. Any firewall that might be needed, would be placed at the central site (at least). So, the issue is how the central site accesses the Internet.
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    One method is to create a separate Internet_Access VPN and have other VPNs create an extranet with that Internet_Access VPN. This method is said to be very secure (at least in terms of backbone exposure). However, if full routing is a requirement, the increased memory demands of this solution might lead you to prefer to keep the internet routing table in the Global Routing Table (GRT). You might have full routing in the GRT of PEs and Ps or in PEs only (second is probably better).
    Some names for solutions that exist are: static default routing, dynamic default routing, separate BGP session between PE and CE (via separate interface, subinterface or tunnel), extranet with internet VRF (mentioned earlier), extranet with internet VRF + VRF-aware NAT.
    The choice will depend on the requirements of your environment. I cannot possibly describe all methods here and I do not know of a public document that does. If you need an analysis of MPLS VPN security, you may want to take a look at Michael Behringer's great book with M.Morrow "MPLS VPN Security". Another book that describes solutions is "MPLS and VPN Architectures" by Ivan Pepelnjak. There is a Networkers session on MPLS VPNs that lists solutions. There is also a relevant document in CCO:
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    M.

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