Update work/den_job_prep.md
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# Data Center Deployment Scenarios with Cisco Nexus
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## 1. Traditional Three-Tier Architecture
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### Components:
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- Access Layer: Nexus 9300 series
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- Aggregation Layer: Nexus 7000 series
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- Core Layer: Nexus 7000 or 9500 series
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### Key Considerations:
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- VLAN design and distribution
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- Spanning Tree Protocol configuration
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- Inter-VLAN routing
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- Layer 3 routing protocols (OSPF, EIGRP)
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- Quality of Service (QoS) implementation
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- Security features (ACLs, authentication)
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### Deployment Steps:
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1. Physical installation and cabling
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2. Initial switch configuration (hostnames, management IPs)
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3. VLAN configuration and distribution
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4. Spanning Tree Protocol optimization
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5. Layer 3 routing configuration
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6. Implementation of security policies
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7. QoS configuration
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8. Monitoring and management setup
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## 2. Spine-Leaf Architecture
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### Components:
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- Leaf Switches: Nexus 9300 series
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- Spine Switches: Nexus 9500 series
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- Border Leaf: Nexus 9300 or 9500 series (for external connectivity)
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### Key Considerations:
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- Equal-cost multi-path (ECMP) routing
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- BGP EVPN for VXLAN overlay
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- Underlay network design (IS-IS or OSPF)
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- Multi-tenancy and network segmentation
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- East-West traffic optimization
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- Scalability and future growth
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### Deployment Steps:
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1. Physical deployment of spine and leaf switches
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2. Underlay network configuration (IP addressing, routing protocol)
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3. Overlay network setup (VXLAN, EVPN)
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4. BGP EVPN configuration on all switches
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5. Multi-tenancy configuration (VRFs)
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6. External connectivity setup on border leafs
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7. Security policy implementation
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8. Monitoring and telemetry configuration
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## 3. Cisco ACI Fabric
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### Components:
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- Spine Switches: Nexus 9500 series with ACI-capable line cards
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- Leaf Switches: Nexus 9300 series ACI-capable switches
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- APICs (Application Policy Infrastructure Controllers)
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### Key Considerations:
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- Application-centric policy model
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- Tenant design and isolation
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- Contracts and filters for security
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- Integration with existing network infrastructure
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- VMware vSphere or Microsoft Hyper-V integration
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- Micro-segmentation capabilities
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### Deployment Steps:
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1. Physical installation of ACI-capable switches and APICs
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2. Initial APIC cluster configuration
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3. Fabric discovery and registration
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4. Tenant creation and VRF configuration
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5. Application Network Profile design
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6. EPG (Endpoint Group) and contract configuration
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7. Integration with virtualization platforms
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8. L4-L7 service integration (firewalls, load balancers)
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9. External connectivity configuration (L3Out)
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## 4. Hybrid Cloud Deployment
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### Components:
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- On-premises: Nexus 9000 series (for spine-leaf or traditional architecture)
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- Cloud Connectivity: Nexus Cloud Services Platform or Cisco Cloud ACI
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- Public Cloud: AWS, Azure, or Google Cloud
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### Key Considerations:
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- Consistent policy across on-premises and cloud environments
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- Secure connectivity between data center and cloud (VPN, Direct Connect)
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- Network address translation and overlap handling
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- Cloud-native services integration
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- Hybrid cloud management and orchestration
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- Disaster recovery and business continuity planning
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### Deployment Steps:
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1. On-premises data center setup (following spine-leaf or ACI deployment)
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2. Cloud network setup (VPCs, VNets, or VCNs depending on the cloud provider)
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3. Establishment of secure connectivity (IPsec VPN or Direct Connect)
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4. Configuration of routing between on-premises and cloud (BGP)
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5. Implementation of consistent security policies
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6. Setup of cloud-based disaster recovery site
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7. Configuration of hybrid cloud management platform
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8. Testing and validation of hybrid connectivity and applications
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## 5. Multi-Site Data Center Interconnect
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### Components:
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- Site A and Site B: Nexus 9000 series in spine-leaf or ACI architecture
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- DCI Links: High-bandwidth, low-latency connections (Dark Fiber, DWDM)
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- Edge Devices: Nexus 9500 or ASR 9000 series for MPLS services
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### Key Considerations:
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- Layer 2 extension technologies (OTV, VXLAN EVPN)
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- Layer 3 DCI (LISP, MPLS VPN)
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- Consistent policy across sites
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- Disaster recovery and business continuity
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- Traffic engineering and bandwidth management
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- Data replication and synchronization
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### Deployment Steps:
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1. Individual site deployment (spine-leaf or ACI)
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2. DCI link establishment and configuration
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3. Layer 2 extension setup (OTV or VXLAN EVPN)
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4. Layer 3 routing between sites (BGP, OSPF)
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5. Implementation of consistent security policies across sites
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6. Configuration of traffic engineering and QoS across DCI
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7. Setup of data replication and synchronization mechanisms
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8. Disaster recovery and failover testing
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## 6. High-Performance Computing (HPC) Cluster
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### Components:
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- Compute Nodes: High-performance servers
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- Storage: High-speed, low-latency storage systems
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- Interconnect: Nexus 9300 series with 100G/400G capabilities
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### Key Considerations:
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- Ultra-low latency requirements
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- High-bandwidth demands
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- Specialized network protocols (RoCE, iWARP)
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- Job scheduling and workload distribution
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- Power and cooling management
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- Monitoring and performance optimization
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### Deployment Steps:
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1. Physical installation of HPC nodes and storage systems
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2. High-speed interconnect deployment (Nexus 9300)
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3. Configuration of low-latency features (cut-through switching, buffer tuning)
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4. Setup of specialized protocols (RoCE, iWARP)
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5. Integration with job scheduling and workload management systems
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6. Implementation of monitoring and telemetry for performance analysis
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7. Power and cooling optimization
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8. Benchmarking and performance tuning
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For each scenario, consider:
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- Scalability requirements
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- Performance metrics and SLAs
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- Security and compliance needs
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- Operational management and monitoring
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- Backup and disaster recovery strategies
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- Future growth and technology evolution
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---
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1. ACI shifts the focus from network-centric to application-centric configurations:
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- Traditional networking focuses on configuring individual network devices (switches, routers) and protocols.
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- ACI instead focuses on the applications and their requirements, abstracting away much of the underlying network complexity.
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