🔄 Can We Use QSFP+ Optics on the QSFP28 Port of a 100G Switch?

The short answer is: Yes, in most cases, you can.

QSFP28 ports are backward compatible with QSFP+ optics, meaning you can use a 40G QSFP+ transceiver in a QSFP28 (100G) port. But there are a few important things to know before you plug and play 👇

✅ Why It Works

• Same Form Factor: QSFP28 and QSFP+ share the same physical size and connector.

• Backward Compatibility: Most 100G switches support QSFP+ modules for 40G transmission.

• Auto-Negotiation: The switch detects the module type and adjusts accordingly.

⚠️ What to Check Before Using

1. Switch Compatibility: Not all 100G switches support 40G optics. Check the vendor’s compatibility list.

2. Port Configuration: Some switches require manual configuration or a specific firmware to support 40G modules.

3. Breakout Support: If you're using a QSFP+ to 4x10G breakout, ensure the switch supports breakout mode.

4. Optics Vendor Lock: Some switches only accept optics from specific brands (OEM locked).

📌 Use Cases

• Reusing existing 40G QSFP+ optics during network upgrades to 100G

• Connecting 40G switches or servers to newer 100G switches

• Cost-effective transitions between 40G and 100G networks

🧠 Tip

Always verify with your switch vendor or datasheet before deployment to avoid compatibility issues.

In short:
QSFP28 ports can typically support QSFP+ optics, making your network upgrades smoother and more flexible.

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