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How to configure a core switch to have two machines

Fiber and communications infrastructure knowledge brief Published 04 Jun 2022

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Dual core switches are typically configured for redundancy and load balancing using technologies like MLAG, VSX, HSRP, and link aggregation to ensure high availability and loop-free operation.

Redundancy and High Availability

Dual core switches are deployed to provide continuous network availability. Each switch can handle traffic independently, but together they form a resilient pair. Common approaches include: HSRP/VRRP: For Layer 3 gateway redundancy, one switch acts as the active gateway while the other is standby, ensuring uninterrupted routing if one core fails.

MLA

G (Multi-Chassis Link Aggregation): Allows both core switches to appear as a single logical switch to downstream devices, enabling load balancing and redundancy while maintaining loop-free Layer 2 connectivity.

VS

X (Virtual Switching Extension): Used in Aruba networks to create a dual-core pair with a shared data plane, supporting multi-chassis link aggregation (MC-LAG) and efficient Layer 2 forwarding.

Link Aggregation and Traffic Load Balancing

To maximize throughput and redundancy: LAG/MC-LAG: Aggregate multiple physical links between core switches and access switches. This provides hash-based load balancing and ensures traffic continues to flow even if a link fails.

Trunking VLA

Ns: Assign VLANs to specific trunks to balance traffic across both cores. For example, VLAN A can use Trunk-1 to Core-1, and VLAN B can use Trunk-2 to Core-2.

Loop Prevention and Spanning Tree

Even with dual-core setups, loop prevention is critical: STP/RSTP/MSTP: Configure spanning-tree with a designated root bridge on one core and a secondary root on the other.

In MLA

G setups, both cores may share the same STP root ID to act as a single logical switch. Priority Settings: Set lower STP priority on the preferred root switch to control root election and prevent instability. Management and KeepalivesOut-of-Band Management: Use dedicated management interfaces for monitoring and VSX/MLAG keepalives to avoid consuming data-plane ports.

MA

C Address Configuration: Ensure each core has a unique bridge MAC unless the architecture (like MLAG) requires a shared system ID for proper operation.

Practical Considerations

Port Planning: Dual-core design reduces the number of required uplinks from aggregation switches, simplifying cabling and reducing port requirements. Scalability: Supports growth in campus or data center networks without redesigning the core layer. Backup Mechanisms: STP acts as a safety net in case of misconfigurations or cabling errors, while MC-LAG/VSX handles primary loop prevention.

By combining redundant cores, link aggregation, gateway redundancy, and proper STP configuration, a dual-core switch setup ensures high availability, load balancing, and simplified network management for enterprise or data center environments.

How to configure a core switch to have two machines - ENSAA OPTICAL NETWORKS [PDF]

How to configure a core switch to have two machines

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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