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Path Optimization for LAN Extension draft-xu-nvo3-lan-extension-path-optimization-00

Path Optimization for LAN Extension draft-xu-nvo3-lan-extension-path-optimization-00. Xiaohu Xu ( Huawei ) Kai Lee (China Telecom) IETF85, Atlanta. Generic Data Center Interconnect Architecture.

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Path Optimization for LAN Extension draft-xu-nvo3-lan-extension-path-optimization-00

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  1. Path Optimization for LAN Extension • draft-xu-nvo3-lan-extension-path-optimization-00 Xiaohu Xu (Huawei) • Kai Lee (China Telecom) IETF85, Atlanta

  2. Generic Data Center Interconnect Architecture • Assume the existing VPLS solution [RFC4761, RFC4762] is used to achieve LAN extension across multiple data center locations and L3VPN [RFC4364] is used by cloud users to access the computing resources within data centers. • Internet gateway is outside of the scope.

  3. Problem Statement • Problem 1: Suboptimal Routing for Incoming Traffic. • Since the subnet associated with the extended LAN has also been extended across multiple locations, the subnet no longer retains its location semantics. • The incoming traffic from cloud users towards a given server within the extended subnet could travel along suboptimal paths. Advertise a route for the extended subnet to PE-3 Advertise a route for the extended subnet to PE-3

  4. Problem Statement (cont.) • Problem 2: Suboptimal Routing for Outgoing Traffic. • To keep the default gateway of the moved VM unchanged, default gateways of different locations are usually configured with identical IP and MAC addresses (e.g., enable VRRP but filter VRRP messages). • However, the VPLS forwarding path towards the VRRP virtual MAC could be pointed to a default gateway at the remote data center. Virtual IP=X Virtual MAC=Y Virtual IP=X Virtual MAC=Y

  5. Solution Requirements • Solution to Problem 1 • Each default gateway router acting as a L3VPN PE router should be capable of creating host routes for those local servers within the extended subnet and propagating them to remote PE routers at cloud user sites. • Solution to Problem 2 • To ensure the outgoing inter-subnet traffic to be forwarded to a local default gateway in normal cases, the LAN extension solution should be able to select the best route (i.e., the closest one) for a given MAC address (e.g., the VRRP virtual MAC address) among multiple possible routes on the control plane.

  6. Next-steps • Comments and suggestions? • Should the path optimization issue and requirement parts of this draft be incorporated into the problem statement draft and the framework draft respectively? • Or should it be adopted as a companion draft to the PS and Framework drafts?

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