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L2VPN Provisioning & Signaling

L2VPN Provisioning & Signaling. draft-ietf-l2vpn-signaling-04.txt. Eric Rosen Wei Luo Bruce Davie Cisco Systems. Vasile Radoaca Westridge Networks. The story so far. Prior versions of this draft describe modular approach to provisioning, discovery and signaling for L2VPNs

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L2VPN Provisioning & Signaling

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  1. L2VPN Provisioning & Signaling draft-ietf-l2vpn-signaling-04.txt Eric Rosen Wei Luo Bruce Davie Cisco Systems Vasile Radoaca Westridge Networks

  2. The story so far • Prior versions of this draft describe modular approach to provisioning, discovery and signaling for L2VPNs • VPWS, VPLS (hierarchical, distributed, and vanilla) • LDP- & L2TPv3-based signaling • BGP-based autodiscovery • Other autodiscovery methods possible • -03 version covered inter-AS issues

  3. Changes from -03 version • Fixed issue with Distributed VPLS advertisement • Provision a VSI_ID per U-PE at N-PE • Advertise one NLRI per N-PE • Modelled on BGP-VPLS draft • Addressed comments on list • See next slide • Clarified use of PE address in VSI identifier • Just a convenience, not requirement • Added IANA considerations

  4. Comments on -03 • Note that the specific structure of AGI & AII spec’ed here may affect other uses of PW signalling • Note the scaling impact of advertising individual forwarders • Clarify the provisioning of Acs • 3.5.4 conflicts with [PW-SWITCH] • Trimmed section dramatically

  5. Comments on -03 (cont.) • Discuss co-ordination of RD and RT assignment among ASes • Note that inter-AS model depends on BGP support by PEs • Explain how route selection among multiple ASBRs is done • Note that ASBR resiliency is provided by BGP (at corresponding timescale) • Note that ASBRs and SPEs are co-located • Editorial comments addressed • New ASCII art to illustrate D-VPLS

  6. Summary • All comments since Minneapolis have been addressed • WG last call for this draft?

  7. Multi-AS tunnel LSP model AC 3 AC 1 PE-3 PE-1 • PE-PE LSP is built as per RFC 2547, option (c) • Addresses of PEs + labels carried in BGP • PW signaling from PE-PE AS 1 AS 2 ASBR-2 ASBR-1 PE-2 PE-4 AC 4 AC 6 Tunnel LSP Attachment circuit Attachment circuit pseudo-wire LDP Auto-discovery (MP-iBGP) Auto-discovery (MP-iBGP) Auto-discovery (MP-eBGP)

  8. Pseudo-wire "switching" model AC 3 AC 1 ASBR-2 ASBR-1 PE-3 pwid 34 PE-1 pwid 78 pwid 111 • Autodiscovery analogous to L3VPN Model (b) - eBGP used between ASBRs • Limiting PW signaling to ASBRs gives control over policy and avoids mesh of PE-PE signaling AS 1 AS 2 PE-2 PE-4 AC 4 AC 6 Pseudowire Attachment circuit Pseudowire Attachment circuit Pseudowire LDP / L2TPv3 LDP / L2TPv3 LDP / L2TPv3 Auto-discovery (MP-iBGP) Auto-discovery (MP-iBGP) Auto-discovery (MP-eBGP) draft-martini-pwe3-pw-switching-01.txt

  9. BGP Autodiscovery • VPLS: BGP advertisement for a particular VSI at a given PE will contain: • an NLRI of AFI = L2VPN1, SAFI = TBD2, encoded as RD:PE_addr • a BGP next hop equal to the loopback address of the PE • extended community attribute containing one or more RTs • VPWS: BGP advertisement for a pool of attachment circuits at a given PE will contain: • an NLRI of AFI = L2VPN1, SAFI = TBD2, encoded as RD:pool_num • a BGP next hop equal to the loopback address of the PE • extended community attribute containing one or more RTs 1. Same for all L2VPN schemes (e.g. vpls-bgp)2. Same value for both cases in this draft

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