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3. Key Technical Specifications
- Access Ports: 24 x 10/100/1000BASE-T RJ45 with PoE (802.3at/af)
- Uplink Ports: 2 x 1/10GbE SFP+ and 2 x 10/40GbE QSFP+
- PoE Budget: High power PoE support across ports
- Switching Capacity: High-performance 10GbE capable fabric
- Forwarding: Wire-speed Layer 2/3
- Management: CLI, SNMP, web interface
- Redundancy: Redundant power supply options
- Form Factor: 1 RU rack-mountable
- Airflow: Front-to-back typical
4. Product Introduction
The Extreme 71G21K2L2-24P2 is a 7100G Series switch featuring 24 Gigabit PoE ports plus two 1/10GbE SFP+ and two 10/40GbE QSFP+ uplinks. It is built for high-density edge and aggregation roles requiring Power over Ethernet in enterprise and data center environments.
This model combines flexible Gigabit copper PoE with high-speed 10/40GbE uplinks in a compact chassis. It delivers the performance needed for converged voice, video, and data deployments on established 7100 platforms.
- 71G21K2L2-24P2
- 71G21K2L2-24P2
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| PoE ports not powering devices | Power budget exceeded or class mismatch | ✅ High | Check “show power inline” for budget and port status | Verify total PoE draw against budget |
| No link on SFP+ or QSFP ports | Incompatible optics or configuration | ✅ High | Use “show interfaces” and verify transceiver | Install Extreme-qualified optics |
| High fan speed or temp alarms | Blocked airflow or high PoE load | ✅ Medium | Monitor environmental sensors | Ensure clear intake/exhaust paths |
| Intermittent connectivity | STP loops or QoS drops | ✅ Medium | Review spanning tree status and counters | Tune STP priorities and QoS policies |
| Management access lost | IP config or VLAN issue | ❌ Low | Console connection | Check management VLAN and IP settings |
| PSU failure | Single supply overload | ✅ High | Check power supply status LEDs | Install redundant PSU if available |
Contact technical support with “show tech-support” and PoE statistics if problems continue after basic checks.
6. Frequently Asked Questions (FAQ)
Does the 71G21K2L2-24P2 support full 802.3at PoE+? Yes. It provides IEEE 802.3at and 802.3af PoE on the 24 Gigabit RJ45 ports with sufficient power budgeting.
What uplink speeds are available? Two 1/10GbE SFP+ ports and two 10/40GbE QSFP+ ports for high-bandwidth aggregation.
Is this switch hot-swappable for power supplies? Redundant power supplies are supported and can be hot-swapped in many configurations. Confirm exact model variant.
Can I use breakout cables on the QSFP ports? Yes, QSFP+ ports typically support 4x10GbE breakout depending on firmware and configuration.
This series is end-of-sale — do you have stock? Yes, limited New Surplus inventory remains for maintenance and spares on existing 7100G deployments.
How does firmware management work? Standard Extreme/Enterasys CLI and tools. We document firmware version during testing. Specify requirements when ordering.
