OpenAI to acquire Neptune
OpenAI is acquiring Neptune to deepen visibility into model behavior and strengthen the tools researchers use to track experiments and monitor training.
What does stacking two core switches mean
Two core switches can be stacked using technologies like Cisco StackWise Virtual to operate as a single logical switch, providing high availability, redundancy, and simplified management.Overview of Core Switch StackingStacking allows multiple physical switches to function as a single logical switch, simplifying management and increasing throughput. For core switches, Cisco's StackWise Virtual technology is commonly used, which connects two physical switches via a StackWise Virtual Link (SVL). This link synchronizes control plane information, forwards data packets, and ensures seamless failover in case one switch fails, providing high availability and redundancy .Benefits of Stacking Core SwitchesSimplified Management: Both switches appear as a single device, reducing configuration complexity .High Availability: If one switch fails, the other continues to operate without network disruption .Increased Bandwidth: Traffic can be load-balanced across both switches, improving throughput .Seamless Failover: Dual-Active Detection (DAD) prevents both switches from acting as active simultaneously, avoiding network loops or conflicts .Considerations Before StackingSwitch Compatibility: Only certain models support StackWise Virtual (e.g., Cisco C9500 series) for core deployments .Firmware Consistency: Both switches must run the same IOS version and feature set to ensure proper stack operation .Topology Planning: Core stacks are typically connected to distribution layers, not directly to access switches, to maintain network hierarchy and performance .Redundancy Planning: While stacking provides resilience, it is not a replacement for full Layer 3 redundancy in large networks; consider HSRP or VRRP for additional failover if needed .Basic Configuration StepsPower off both switches and disconnect all links.Connect the switches using the StackWise Virtual Link (SVL) ports.Enable StackWise Virtual on both switches and configure the SVL.Set priorities to determine which switch becomes the primary (master) in the stack .Power on the switches sequentially, ensuring the master switch initializes first.Verify stack status and ensure both switches are synchronized and operating as a single logical unit .Best PracticesUse dedicated stacking ports and cables for reliability .Maintain a ring topology if supported, to provide redundancy in the stack link .Regularly update firmware to the same build on both switches to prevent compatibility issues .Monitor the stack for dual-active scenarios and configure DAD to mitigate risks . Stacking two core switches is a robust solution for small to medium enterprise networks or simplified core/distribution designs, providing both high availability and easier management while maintaining network performance and redundancy.
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