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Dual-machine virtualization of core switches

Fiber and communications infrastructure knowledge brief Published 16 Feb 2021

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-machine virtualization allows two physical core switches to operate as a single logical switch, enhancing high availability, scalability, and simplified management. OverviewDual-machine virtualization, exemplified by Cisco StackWise Virtual, enables two physically separate switches to function as a single logical switch. This approach consolidates the control and management planes while maintaining distributed forwarding planes, allowing both switches to actively forward traffic and share configuration and state information.

The virtualized pair appears as a single switch to the network, simplifying topology and reducing the risk of loops.

Key Benefits

High Availability: One switch acts as the active device while the other serves as standby. Stateful Switch Over (SSO) and Non-Stop Forwarding (NSF) ensure seamless failover without traffic disruption. Scalability: Bandwidth is effectively increased as both switches forward traffic locally, and Multi-chassis EtherChannel (MEC) allows link aggregation across the two devices.

Simplified Management: Network administrators manage the pair as a single entity, reducing configuration complexity and operational overhead.

Loop-

Free Topology: The spanning-tree domain treats the virtual pair as a single bridge, preventing Layer 2 loops and improving convergence times. Configuration ConsiderationsInter-Switch Link: A dedicated Ethernet connection, often called the StackWise Virtual Link (SVL), synchronizes state and forwarding information between the two switches.

VLAN and ST

P Alignment: VLAN IDs must be carefully managed to avoid spanning-tree loops.

ST

P root priorities should be configured to align with the virtual switch design. First Hop Redundancy Protocol (FHRP): Virtualizing the IP gateway function requires fine-tuning of FHRP timers to ensure rapid failover and alignment with STP priorities. Multicast Optimization: Protocol Independent Multicast (PIM) configurations may need adjustment to optimize multicast forwarding across the virtualized pair.

Operational BehaviorActive/Standby Roles: The active switch handles all control plane functions, including management, Layer 2 and Layer 3 protocols, and software updates, while the standby switch mirrors the state. Distributed Forwarding: Both switches forward traffic locally. If traffic needs to traverse to the other switch, it is sent over the SVL, ensuring efficient data-plane operation.

Fault Tolerance: In case of a switch failure, the standby immediately assumes the active role, maintaining uninterrupted network services.

Relation to Multicore Virtualization Concepts

The principles of dual-switch virtualization are conceptually similar to multicore CPU virtualization, where physical resources are abstracted to provide logical units for efficient workload distribution. Just as vCPUs allow multiple virtual machines to share physical cores, StackWise Virtual allows two physical switches to share control and forwarding responsibilities while maintaining isolation and redundancy. SummaryDual-machine virtualization of core switches provides a resilient, scalable, and manageable network architecture.

By treating two physical switches as a single logical entity, organizations can achieve high availability, simplified management, and optimized traffic forwarding, making it ideal for modern campus and data center networks.

Dual-machine virtualization of core switches - ENSAA OPTICAL NETWORKS [PDF]

Dual-machine virtualization of core switches

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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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