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IaaS Providers need next-generation virtualized networks, providing large-scale multi-tenancy services and meeting new requirements in terms of efficiency and availability. The main limitation of current network architectures mainly comes from inadequate design standards. In this presentation, we present a TRILL based multi-tenant network architecture for virtualized data center networks. This architecture allows the best of both layers (bridging and routing), thus building a large-scale layer-2 network while ensuring scalability, efficiency, fault-tolerance and simplified management. This enables also the creation of large numbers of logical networks within a virtualized data center. The kernel part of our solution is currently developped in the Linux kernel.
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VIRTUAL NETWORK OVERTRILL
DESIGN, IMPLEMENTATION AND DEMONSTRATION - Gandi.netWilliam Dauchy
Kernel Recipes 2013
CONVENTIONAL DATA CENTER
MAIN GOALprovide large scale multi-tenancy
LARGE SCALE MULTI-TENANCYMultiples users using same resources
REQUIREMENTSSeamless VM mobilityEasy managementLayer 2 core scalingFault resilianceVLAN scalability
LAYER 2 - SWITCHING BENEFITSManagement simplified + Plug & playSeamless Virtual Machine mobilityAuto learning + determistic failover
LAYER 2 - SWITCHING LIMITATIONA large number of tenants implies
a huge number of MAC address in switch table (TCAMoverflow)ARP storm at nodes
STP to ensure a loop free topologyblocking redundant pathsCore-computes required, recomputes when topologychanges
Number of VLANs is limited to 4096
TRILL BASED DATA CENTER
WHAT IS TRILLNew device: RBridge
Control planeData plane
Encapsulate native frames in a transport headerProviding a hop count and nicknameRoute the encapsulated frames using IS-ISDecapsulate native frames before delivery
IETF STANDARDRFC 5556 Transparent Interconnection of Lots of Links (TRILL): Problem and Applicability Statement
RFC 6325 Routing Bridges (RBridges): Base Protocol Specification
RFC 6326 Transparent Interconnection of Lots of Links (TRILL) Use of IS-IS
RFC 6327 Routing Bridges (RBridges): Adjacency
RFC 6439 Routing Bridges (RBridges): Appointed Forwarders
RFC 6361 PPP Transparent Interconnection of Lots of Links (TRILL) Protocol Control Protocol
DESIGN AND IMPLEMENTATION
CONTROL PLANEunicast building
CONTROL PLANEunicast building - first iteration
CONTROL PLANEunicast building - second iteration
CONTROL PLANEunicast building - third iteration
CONTROL PLANEunicast building - final result
CONTROL PLANE
CONTROL PLANEmulticast building - first iteration
CONTROL PLANEmulticast building - final iteration
DATA PLANE
DATA PLANE
DATA PLANE
DATA PLANE
DATA PLANE
IMPLEMENTATION - SENDING
IMPLEMENTATION - RECEIVING
LAYER 2 - SWITCHING LIMITATIONA large number of tenants implies
a huge number of MAC address in switch tableARP storm at nodes
STP to ensure a loop free topologyblocking redundant pathsCore-computes required, recomputes when topologychanges
Number of VLANs is limited to 4096
TRILL + VNI = VNTVirtual Network over TRILL
VNT FRAME FORMAT
VNI LIFE
VNI TOPOLOGY BUILDING
VNI TOPOLOGY BUILDING
VNI TOPOLOGY BUILDING
IMPLEMENTATION WITH VNI - SENDING
IMPLEMENTATION WITH VNI - RECEIVING
LINUX BIG PICTURE
DEMONSTRATION
SCREENCASTscreencast
(live explanation to understand what's going on)
PH.D. STUDYAhmed Amamou - ahmed@gandi.net
"Network isolation for Virtualized Datacenters"
University Pierre & Marie Curie - GANDI SAS
project still in development and cleaning
TRILL sources: github.com/Gandi/ktrill
VNT: still two research projects working on it - drafts
GANDI.NETGandi Hosting - gandi.net/hosting
William Dauchy - william@gandi.net
slides pres.gandi.net/kr2013
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