• Author : Naveen Kumar Devaraj

 
 

Layer 2 Data Center Interconnect – Reference Designs

Introduction VxLAN is a popular choice for extending Layer 2 both intra and inter DC using overlays. Arista offers multiple control plane choices for VxLAN: Static HER, CVX and EVPN. In this article, two approaches to designing a L2 DCI over a L3 underlay are discussed. High-level technical details of each design approach is described first, followed by a comparison of the two options along with their typical use cases. Design 1: Multi-domain Overlay In this design, two overlay domains are identified: DC Fabric domain: This is the VxLAN domain within the DC Layer 3 Leaf-Spine Fabric with Leafs acting...
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CloudVision Appliance Deployment Recommendations

CloudVision Appliance Introduction CloudVision Appliance is a physical appliance that runs CentOS base image and hosts one instance of each CloudVision Portal (CVP) and CloudVision eXchange (CVX) using KVM hypervisor. It comes with 4X1G NICs. The virtual NICs on CVP, CVX VMs are mapped to the physical NICs 1-4 as follows: For additional details, refer to CloudVision Appliance quick start guide here. Deployment Recommendations 1. Ensure that you are running the latest version of the host image; this provides updated OS packages and security patches. The current version of the host image can be checked using the following command from...
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Summary of Arista VxLAN Control Plane Options

IP Multicast Head End Replication (HER) with static flood-set CloudVision eXchange (CVX) Ethernet VPN (EVPN) – VTEPs within a VNI join a configured control plane multicast group.– BUM traffic is sent to all VTEPs within the VNI over the configured multicast-group.– Arista supports only multicast decapsulation to interop with third-party VTEP(s). HER will be used for BUM traffic encapsulation.  – Underlay needs to be multicast capable which can possibly make the deployment limited.– Recommended for deployments where Arista VTEPs need to interop with legacy third-party VTEPs that support only multicast underlay for BUM traffic handling. – BUM traffic within a...
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CVX Deployment Recommendations for VxLAN Control Service

CVX (CloudVision eXchange) is an infrastructure for aggregating and sharing state across a network of physical switches running EOS. Services that run on top of this infrastructure provide network-wide visibility and coordination. CVX is a single pane of glass for network wide visibility and orchestration of physical switches running EOS. CVX provides VxLAN Control Service (VCS) which is a mechanism by which hardware VTEPs share states between each other in order to establish VxLAN tunnels without the need for a multicast control plane or manual configuration of static flood-set for Head End Replication. CVX is built on the same underlying...
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