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Configuration of Core and Aggregation Switches

Core switches provide high-speed Layer 3 routing and redundancy, while aggregation switches consolidate access switch traffic and provide Layer 2/3 services.Understanding Roles
  • Core Switches: Serve as the backbone of the network, handling high-speed packet switching, Layer 3 routing, and connectivity to aggregation switches. They are designed for high throughput, low latency, and fault tolerance .
  • Aggregation Switches: Aggregate traffic from multiple access switches, provide Layer 2 and some Layer 3 services, support VLANs, QoS, and link aggregation, and often connect to firewalls or other network services .
  • Access Switches: Connect end devices like PCs, IP phones, and APs, often with PoE support, and forward traffic to aggregation switches .
Core Switch Configuration
  1. Redundancy and High Availability:
    • Deploy core switches in pairs using technologies like VSX, MC-LAG, or VPC to ensure continuous connectivity .
    • Configure inter-switch links (ISL) using link aggregation (LAG) for the VSX or MC-LAG setup .
  2. Routing and Layer 3 Services:
    • Enable dynamic routing protocols such as OSPF or EIGRP for campus or data center connectivity .
    • Configure VLANs for management, transit, and external network routing. Assign SVI interfaces for Layer 3 termination .
  3. Management VLAN and Subnet:
    • Set up a management VLAN and assign a gateway IP on the core switch. Enable DHCP for aggregation and access switches if needed .
    • Enable management VLAN auto-negotiation to allow downstream switches to automatically join the management network .
Aggregation Switch Configuration
  1. VLAN and Layer 2/3 Setup:
    • Configure VLANs to aggregate access switch traffic. Enable Layer 2 multi-pathing using vPC or LACP for redundancy .
    • Optionally enable Layer 3 routing for inter-VLAN traffic if the aggregation switch supports it .
  2. Link Aggregation:
    • Use LACP to bundle multiple physical links between aggregation and core switches for load balancing and failover .
    • For higher resilience, consider MC-LAG to allow two aggregation switches to act as a single logical unit .
  3. Integration with Core Switches:
    • Connect aggregation switches to core switches using redundant uplinks.
    • Ensure VLANs and routing configurations match the core switch to maintain seamless traffic flow .
Deployment Best Practices
  • Layered Approach: Use a three-tier architecture (core, aggregation, access) for scalability and performance .
  • Plug-and-Play Management: For large deployments, import device and Eth-Trunk information into a network controller to enable automatic provisioning .
  • Redundancy and Failover: Always configure dual uplinks, LAGs, and VRF/HSRP where applicable to prevent single points of failure .
  • Monitoring and Maintenance: Enable LLDP for link discovery and ensure proper monitoring of core and aggregation switches for proactive management . By following these steps, you can configure a robust, scalable, and highly available network where core switches handle routing and aggregation switches efficiently consolidate access traffic.
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