L2 VPN Architecture in .NET framework

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L2 VPN Architecture
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At the originating site, a CE connects by an attachment VC to a PE (see Figure 1312) There is no strict requirement that the two customer sites have the same layer 2 interface, but then there must be an interworking function somewhere in the service From the PE, provider routing creates a tunnel capable of carrying L2 traffic between CE1 and CE2 (see Figure 1313) Assuming each CE connects to a different PE, the minimum topological definition of an emulated link is the triplet <CE1-PE1, PE1-PE2, PE2-CE2> Make sure to distinguish between the emulated VC and the PE-PE tunnel that carries one or more emulated VCs The L2 VPN architecture is agnostic to the tunneling mechanism, and there are clear applications at least for MPLS, L2TP, and IPSec The tunneling protocols will probably need extensions to carry L2
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Customer Site Customer Router CE Customer Routing Protocol, Usually IGP
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Customer Site Customer Router CE
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Provider Emulated Virtual Circuit or Emulated LAN
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Figure 1312 L2 VPN customer connectivity
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Multiplexed tunnel, carrying customer VC or emulated LANs
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Figure 1313 Inter-PE L2 VPN connectivity
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VPN specific information Current proposals suggest extensions of MPLS signaling to insert the emulated VC ID into the multiplexing field There is no requirement that either all emulated VCs between two PEs or two CEs travel through the same tunnel This, in fact, may be undesirable, as it creates a sharedrisk group (see 11)
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RFC 2547: MPLS/BGP Virtual Transport Service
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L2TP is less attractive as a basic mechanism for interconnecting enterprise sites because it supports only a point-to-point topology, whereas services based on RFC 2547 can support any topology Because 2547 s bulk transfer mechanism inside the carrier network is MPLS, it has much less tunneling overhead than does L2TP While its transfer mechanism is MPLS, its routing control plane is BGP, for which some extensions will be needed (See RFC 2547 and BGP ) Multiprovider VPNs are in their infancy Nevertheless, the RFC 2547 approach seems the consensus solution, although there is a resurgence of interest in multiple virtual router architectures Layer 2 VPNs are not directly comparable with either of these architectures In non-MPLS networks, connectivity might be provisioned with virtual circuits It can be useful in an assortment of ISP business models, ranging from turnkey remotely managed enterprise networks to VTN service with the demarcation point at the CE to wholesale VTN service offerings to other ISPs Internet access is part of what the enterprise customer can see from a centrally managed service, although Internet access is not a function of the service core but an alternate path taken at the edge For Internet access, some globally routable addresses need to be associated with the customer sites, although NAT, address-translating firewalls, application layer gateways, and so on can help the enterprises minimize their public address space and maximize their use of private address space [RFC 1918] When customers are being connected to the ISP, the ISP is strongly advised to implement [RFC 2267] ingress filtering, which, when applied as routine in the global Internet, will help protect both enterprises and ISPs from denial-of-service attacks
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VPNs and Related Services
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Extranet applications managed by the ISP are certainly possible and practical, with the major caveat being that the different enterprises that compose the extranet must have nonoverlapping address space If any of the enterprises comprising the VPN have Internet connectivity, the security implications of such connectivity need to be evaluated on a case-by-case basis Enterprise customers access VPNs through customer edge (CE) devices at customer sites The definition of a site is flexible From the RFC 2547 standpoint, multiple physical sites linked by customer-operated facilities appear as one RFC 2547 site (Figure 1314) Alternatively, as in (Figure 1315), the CE may be distributed between the physical customer site and the POP CE connects to one or more provider edge (PE) routers operated by the service provider The PE routers connect to other PE and P functions As seen in Figure 1315, CE components can be, but do not need to be, routers CE may be managed by the enterprise or by the service provider Most commonly, the CE is a non-BGP-speaking router that points default at one or more PEs According to RFC 2547, CE does not have awareness of all routes in its VPN; that knowledge is on the set of PE that supports the CE s VPN
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