draftxunvo3lanextensionpathoptimization00 Xiaohu Xu Huawei Kai Lee China Telecom IETF85 Atlanta Generic Data Center Interconnect Architecture Assume the existing VPLS solution RFC4761 RFC4762 is used to achieve LAN extension across multiple data center locations an ID: 509664
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Slide1
Path Optimization for LAN Extension
draft-xu-nvo3-lan-extension-path-optimization-00
Xiaohu
Xu
(
Huawei
)
Kai Lee (China Telecom)
IETF85, AtlantaSlide2
Generic Data Center Interconnect ArchitectureAssume 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.Page 2Slide3
Problem StatementProblem 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.Page 3
Advertise a route for the extended subnet to PE-3
Advertise a route for the extended subnet to PE-3Slide4
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.Page 4
Virtual IP=X
Virtual
MAC=Y
Virtual IP=X
Virtual
MAC=YSlide5
Solution RequirementsSolution to Problem 1Each 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 2To 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.Page 5Slide6
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?Page 6