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Two core switches connected

Fibre interconnection and data room reference Published 11 May 2026

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Two core switches can be connected for redundancy using MLAG, HSRP/VRRP, or EtherChannel, ensuring high availability and proper failover.

Physical Connection Options

Cascading: Connect the two switches using standard Ethernet ports. This increases available ports but keeps switches as independent devices. Each switch can be connected to access switches for redundancy.

Stacking: If supported, use dedicated stacking ports and cables to create a single logical switch. This provides unified management and redundant backplane bandwidth but usually requires the same vendor.

MLA

G (Multi-Chassis Link Aggregation): For switches like Extreme XOS or Cisco Nexus, MLAG allows links from access switches to appear as a single EtherChannel across two core switches, providing redundancy without stacking. Redundancy and FailoverHSRP/VRRP/GLBP: Configure a First Hop Redundancy Protocol to provide a virtual gateway IP. If one core switch fails, the standby switch automatically takes over, avoiding manual intervention.

Ether

Channel: Aggregate multiple links between core switches or between core and access switches to increase bandwidth and provide link-level redundancy. Spanning Tree Protocol (STP): Ensure STP (preferably Rapid-PVST or RSTP) is configured to prevent loops. One core switch can be the root for certain VLANs, and the other can be secondary, balancing traffic and providing failover.

Best Practices

Connect each access switch to both core switches to achieve true redundancy. Use tracking features in HSRP/VRRP to monitor critical interfaces, such as uplinks to the firewall or internet, so failover occurs automatically. For high-performance environments, consider vPC (Virtual Port Channel) on Cisco Nexus or MLAG on Extreme switches to allow dual-active links without loops.

Maintain consistent firmware versions and configurations across core switches to avoid compatibility issues. Document all connections, VLAN assignments, and failover configurations for easier troubleshooting and maintenance.

Summary

Connecting two core switches effectively requires combining physical redundancy (dual connections, EtherChannel, MLAG) with logical redundancy (HSRP/VRRP, STP configuration). Proper planning ensures that if one core switch fails, traffic continues seamlessly, access switches remain connected, and network stability is maintained. This approach is applicable across vendors, but specific commands and features may vary depending on the switch model and manufacturer.

Two core switches connected - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Two core switches connected
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