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Lecture 7. L2 MPLS VPN: VPWS, (H)VPLS

Lecture 7. L2 MPLS VPN: VPWS, (H)VPLS. D. Moltchanov , TUT, Spring 2010. Outline. L2 MPLS VPNs Architecture VPWS VPLS Some notes on HVPLS, IPLS. Types of L2 MPLS VPN. VPWS Virtual Private Wire Services Point-to-point VPLS Virtual Private LAN Services Point-multipoint HVPLS

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Lecture 7. L2 MPLS VPN: VPWS, (H)VPLS

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  1. Lecture 7. L2 MPLS VPN: VPWS, (H)VPLS D. Moltchanov, TUT, Spring 2010

  2. Outline • L2 MPLS VPNs • Architecture • VPWS • VPLS • Some notes on HVPLS, IPLS

  3. Types of L2 MPLS VPN • VPWS • Virtual Private Wire Services • Point-to-point • VPLS • Virtual Private LAN Services • Point-multipoint • HVPLS • Hierarchical VPLS • Point-multipoint • IPLS • Modification of VPLS for IP only • Point-multipoint • … • VPLS, HVPLS, IPLS: same principles!

  4. L2 MPLS VPN: VPWS andVPLS • VPWS • VPLS, HVPLS, IPLS

  5. Virtual Private Wire Service

  6. VPWS:point-to-point • VPWS • “draft-martini-l2circuit-trans-mpls-08.txt” • “draft-martini-l2circuit-encap-mpls-04.txt” • Known as ‘martini’ • Basis is point-to-point • Simplex Virtual Circuits (VC) • LSPsinMPLS:tunnels that carry theseVCs • Two labels in the header • LSP:LSP label (identifiesLSPto a certainPE) • VC:VC label (identifiesCE) • Ctrl.:Control information

  7. VPWS:procedure • Set upLSP • We can useLDP, CR-LDP or RSVP-TE • ExchangeVC label • PEat the source side • Receives frame from CE • Encapsulates it in a new frame • Assign two label (VС label first) • PE at the remote side • Receives frame from the network • Identifies user’s interface based on VC label • Original frame is sent to the user

  8. VPWS: basic principles • Adding newCE • Setting local connection with PE1: configuring • Detecting other PE in this community: PE auto detection • Setting up LSPs to themPE: signaling • Data transfer

  9. VPWS: basic principles • TL: Tunnel (LSP) Label betweenPE • AC: Attachment Circuit: L2 access toPE: Eth., FR, ATM • VF: Virtual Forwarders: local forwarding table • MPLS pseudo-wire (PW):path betweenVF • Determined byVCL-TL labels

  10. VPWS: basic principles

  11. VPWS: bacis characteristics • No PE auto detectioninVPWS • Additional function inVPLS • OnlyLDPforPW establishment • Pseudo-wire (PW): (TL-VCL) • Simple Virtual Forwarders • Everything betweenVCandL2 interface

  12. VPWS: advantages/shortcomings • Advantages • Easy to use in ISPs’ networks • Only PEs have to be configured • Notonly IP traffic • IPX, SNA, whatever • Customer equipment can be simple • Switch, hub, bridge… • Single-side and double-side provisioning • Shortcomings • Ineffective resource usage

  13. Virtual Private LAN Service

  14. VPLS: in brief • Virtual Private LAN Services (VPLS) • Transport in ISP’s network is similar toBGP/MPLS • The difference is howCE-PE interoperate • VPLS • CEis not required to be router • There is no need for a number of switching table • PEmapsL2toMPLS LSP • Carries not onlyIP • Similarities betweenBGP/MPLSandVPLS • BGP/MPLS:PE supportsVRF • There can be several VRF (one per VPN)associated with PE • VPLS: PEsupports switching tables • There can be several of those (one per VPN) for each PE

  15. VPLS: properties • Aim of VPLS • WAN/MAN service similartoEthernet • VPLSforum: http://www.vpls.org/ • Difference compared to leased lines • Bandwidth is not fixed • Similar toEthernet • Sufficiently popular • Easy to use • Cost-effective • Cheap customer equipment • Flexibility • Easy to control • Connection type in VPLS • Point-to-multipoint • LAN emulation

  16. VPLS:point-to-multipoint • Idea:emulateL2 switch • Switching in WAN/MANbased on MAC address • VPLS: draft-lasserre-vkompellappvp-vpls-00.txt

  17. VPLS: basics • Basics of VPLS: • Full mesh • 2*2NLSPs are required, Nis the number of CE in VPN • VPN identification • UniqueVPN ID: 32bits • Extension to VPN ID: 56 bits, 64 bits • Extension to VPN ID: string • Site (CE) identifiers:labels!

  18. VPLS:basic principles • PE function • DetectingMACaddressesfromVC

  19. VPLS:basic principles • PE functions • Switching based onMACaddress

  20. VPLS:basic principles • PE functions • No entry in the switching table

  21. VPLS:basic principles • PE functions • Virtual Switched Instance (VSI)instead ofVF

  22. VPLS: setting up VPN • PE auto detection • Creating mesh topology • UsingVSIfor data transfer

  23. VPLS: VPN identification • ConnectVSIvia the network • Identify PW using (PE IP, VPNid) • VSI must be connected intofull mesh

  24. VPLS: configuringPE • List of remotePE • Automatically (BGP) ormanually

  25. LDP-VPLS:setting upLSPsandPWs • AddingCE1: configuringPE2, LDP mapping • PWs connect VSIs • By analogy toVPWS, butPWconnectsVSI, notAC!

  26. LDP-VPLS: data transfer • PE: full mesh

  27. LDP-VPLS: data transfer – single node • Local loop detection, the following is only possible • AC-AC • AC-PW • PW-AC

  28. LDP-VPLS: broadcasting • Broadcasting • To allPEthat have at least oneVPNid = “Yellow”

  29. LDP-VPLS: point-to-point • Point-to-point • IfMACY is knownthen to only onePE, then to only oneCE!

  30. LDP-VPLS:broadcasting phase • Point-to-point (broadcasting phase) • Gatheringinformation about MACaddress in remote networks!!! • OnlyVPNid = “Yellow”

  31. Example LDP-VPLS: Riverstone

  32. PE auto detection (BGP) • Information about VPNs as a part ofMP_Reach_NLRI • AFI (address family identifier):assigned by IANA • SAFI (subsequent address family identifier): 0000 00LW, • L:VPLS, W:VPWS

  33. VPLS: advantages/shortcomings • Advantages fo VPLS • Seamless use of Ethernet across WAN/MAN • SLA can be used • PErouters can be simple • Not only IP • ISP do not know what happens in customer’s network • Simple CE (switch, bridge, hub) • Compatible withBGP/MPLS • Easily controlled • Shortcomings of VPLS • PE auto detection is not often used • Depends on implementation • Scalability • A lot ofLSP: indeed, full mesh! • Solution: use hierarchialVPLS (HVPLS)

  34. HVPLS: principles • VPLS problem №1:2*2Nnodes in VPLS • Performance, resource reservation • Solution:use user-basedPE (U-PE) • draft-ietf-l2vpn-vpls-ldp.txt • VPLS problem №2: • PEshould know a lot of MAC addresses • Solution:pass this functionto U-PE • draft-kompella-ppvpn-dtls.txt

  35. HVPLS: Nortel Networks

  36. L2 VPN IETF: basic standards • PE auto detection (BGP) • draft-ietf-ppvpn-bgpvpn-auto-05.txt • Signaling • draft-ietf-l2vpn-signaling-00.txt • draft-ietf-pwe3-control-protocol-03.txt • Incapsulation • Common format: draft-ietf-pwe3-<протокол>-encap-<год>.txt • Ethernet: draft-ietf-pwe3-ethernet-encap-03.txt • Particular solutions • LDP-VPLS: draft-ietf-ppvpn-vpls-ldp-00.txt • BGP-VPLS: draft-ietf-ppvpn-vpls-bgp-00.txt • IPLS: relaxing complexity of broadcasting phaseVPLS • Only for IP atL3!

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