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Centralized VXLAN
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Distributed VXLAN
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Layer 3 gateway location
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Layer 3 gateway is deployed at Spine
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Layer 3 gateway is deployed at Leaf
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Layer 2 gateway location
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Layer 2 gateway is deployed at Leaf
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Layer 2 gateway is deployed at Leaf
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Traffic forwarding rules
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Layer 3 traffic under the same -Leaf needs to detour the Spine
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Layer 3 traffic under the same -Leaf does not need to detour the Spine
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Table item storage rule
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The Spine needs to store the MAC and ARP of the entire network
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The Spine does not need to store the MAC and ARP of the entire network
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Control Plane
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Static or EVPN
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EVPN
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Operation and Management (O&M)
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Simple, because the gateway is at Spine
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Complex, because the gateway is at Leaf
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Applicable Data center scale
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Suitable for small scale networking
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Suitable for medium and large scale networking
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Static mode
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IS-IS mode
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EVPN mode
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Controller mode
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Tunnel Construction method
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Adopts a static configuration approach
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ENDP(Enhanced Neighbor Discovery Protocol) must be configured on VTEPs to discover VTEPs and establish tunnels
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The extended BGP attribute enables neighbor discovery, automatically discovers VTEPs in VXLAN networks, and automatically creates VXLAN tunnels between VTEPs
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Controller
System-controller
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Tunnel establishment method between VTEPs
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Adopts a static configuration approach
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IS-IS protocol extension mode
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VXLAN tunnels are automatically established through BGP extended attribute associations
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Controller
System-controller
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Address learning
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Learns MAC address flooding
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IS-IS protocol is implemented to learn remote addresses
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Implementation of extended MP-BGP protocol
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First packet reported,
The forwarding table item is issued by the Controller
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Standardization
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No control plane
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Private protocol, extend IS-IS packets
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The control protocol of EVPN has been standardized, see RFC 7348RFC7209, RFC7432
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VTEP and Controller are based on the standard protocol framework Netconf/0penFlow, but each manufacturer has its own private definition, so they are not compatible
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Related Blog:
Exploration of Data Center Automated Operation and Maintenance Technology: Zero Configuration of Switches
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Technology Feast | A Brief Discussion on 100G Optical Modules in Data Centers
Research on the Application of Equal Cost Multi-Path (ECMP) Technology in Data Center Networks
Technology Feast | How to build a lossless network for RDMA
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