VPN taxonomy. János Mohácsi NIIF/HUNGARNET tf-ngn meeting April 2005
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1 VPN taxonomy János Mohácsi NIIF/HUNGARNET tf-ngn meeting April 2005
2 VPNs Definition: the capability of both private and public networks to support a communication infrastructure connecting geographically dispersed sites where users can communicate among them as if they were in a private network (RFC 2764) VPNs can be implemented in many ways: Customer Premises Equipment (CPE) based solutions Network based solutions Motivation: Need private communication networks for multiple sites => private WANs
3 Different VPN types Virtual Leased Lines/Virtual Private Wire Service (VPWS) Virtual Private Routed Networks (VPRNs) Virtual Private LAN Service (VPLSs) Virtual Private Dial Networks (VPDNs)
4 Type I: Virtual Leased Lines (VLLs) Virtual Private Wire Service VPWS = IP/MPLS tunnel forming a point-topoint link to emulate a physical leased line or dedicated connection. Require IP/MPLS tunneling mechanism forwarding disjoint from the address fields of the encapsulated packets, allow opaque transport of frames as packet payload. e.g. IP/IP, GRE tunnels, L2TP (PPP packets), MPLS, and IPSec
5 Type II:Virtual Private Routed Networks A VPRN emulates a multi-site wide area routed network over IP, consisting of a mesh of IP tunnels btw ISP routers & routing capabilities stub links connecting CPE routers to ISP routers CPE ISP tunnel ISP CPE Backup link Stub link ISP ISP edge router CPE Backdoor link
6 VPRNs /2 Benefit: Configuration of the CPE router is simplified. ISP edge router appears to be a neighbor router. The burden of tunnel establishment, maintenance and routing is on ISPs. Forwarding is done at the network layer (Layer 3 or 2.5 MPLS). Each customer side CPE router is connected to an ISP edge router through one or more stub links Each VPRN supports only a single network layer protocol.
7 CPE Type III:Virtual Private LAN Service A VPLS emulates a LAN segment over IP. equivalent to VPRN, except now IP tunnels extend all the way to CPE routers, and ISP edge routers provide Link Layer bridging (layer 2 connectivity alone). VLAN or circuit level ISP tunnel ISP CPE ISP ISP edge router CPE Backdoor link
8 VPLS Very similar to VPRNs Unlike VPRNs, CPE nodes can either be bridges or routers nature of CPE (bridge Vs router) impacts nature of encapsulation, addressing, forwarding and reachability protocols within the VPLS. Advantage: protocol transparency
9 Type IV: Virtual Private Dial Networks A VPDN allows for remote users to connect on demand into remote sites through an ad-hoc tunnels. E.g. PPP connections to network access server Strong binding btw a particular user and a central side requires authentication & security L2TP (Layer 2 Tunneling Protocol) allows user PPP sessions from L2TP access concentrator (LAC) to a remote L2TP network server (LNS)
10 VPN solutions VPN Services L3 VPN L2 VPN MPLS VPN (RFC 2547) IPSEC VPLS VPWS Point to Cloud (PE to cloud) Over MPLS CE based solution Multi-point to Multipoint over MPLS Ethernet only AtoM, CCC, TCC Point to Point over MPLS Ethernet/ATM/FR L2TPv3 Point to Point over IP core ATM/FR
11 Attachment Circuits Pseudo Wires PSN Tunnels End Point Discovery VPLS components PE PE Pseudo Wires CE-2 manual/bgp/radius CE-1 PSN Tunnel Auto Configuration/signaling Directed LDP/BGP Attachment VC PE Virtual Switch Instance / Virtual Forwarding Instance like L2 learning bridge (flooding, forwarding, MAC learning/aging) CE-3 Running STP per VPLS instance Loop prevention: split horizon + full mesh!
12 IETF L2VPN WG Status After IETF 62
13 Ready to be published? Service Requirements for Layer-2 Provider Provisioned Virtual Private Networks draft-ietf-l2vpn-requirements-04.txt IESG review Framework for Layer 2 Virtual Private Networks (L2VPNs) draft-ietf-l2vpn-l2-framework-05.txt RFC Ed Queue
14 WG Last Call Done VPLS solutions draft-ietf-l2vpn-vpls-bgp-03.txt IDR review done Minor PWE3 dependency draft-ietf-l2vpn-vpls-ldp-06.txt PWE3 dependency
15 WG Documents Several around for a while IPv4 only L2VPN cannot finalised until IPv6 and IS-IS not supported draft-ietf-l2vpn-arp-mediation-01.txt draft-ietf-l2vpn-ipls-01.txt Different signaling proposals draft-ietf-l2vpn-radius-pe-discovery-01.txt draft-ietf-l2vpn-l2tp-radius-vpls-00.txt draft-ietf-l2vpn-signaling-02.txt VPLS (LDP) Applicability Statement draft-ietf-l2vpn-vpls-ldp-applic-00.txt
16 OAM drafts WG document draft-ietf-l2vpn-oam-req-frmk-02.txt Solution documents draft-aissaoui-l2vpn-vpws-iw-oam-02.txt draft-stokes-vkompella-l2vpn-hvpls-oam-00.txt
17 Multicast VPLS draft-serbest-multicast-vpls-00.txt PIM snooping (updated version didn t get posted) draft-raggarwa-l3vpn-mvpn-vpls-mcast-00.txt where to replicate
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