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Q
What is the Cisco Catalyst 3750 Network Module?
A
The Cisco Catalyst 3750 Network Module is an optional uplink or service expansion card that provides flexible 1 GbE or 10 GbE connectivity, enhancing the base switch’s port density and uplink performance.
Q
Which network modules are compatible with the Cisco Catalyst 3750 switch?
A
Supported modules include NM-1G, NM-2-10G, NM-4-10G and select WS-X6700 series cards; compatibility requires a valid IOS image and an open module slot on the 3750 chassis.
Q
How do I install a Cisco Catalyst 3750 Network Module?
A
Power down the switch, align the module with the expansion slot, slide it in until it latches, secure the captive screws, then power on the switch to auto-detect the module.
Q
Can I hot-swap the network module on a Catalyst 3750?
A
No; Cisco recommends powering off the Catalyst 3750 before installing or removing a network module to prevent data-plane interruptions and hardware damage.
Q
What uplink speeds are supported by Catalyst 3750 network modules?
A
Available uplink options include 1 GbE on NM-1G, dual-10 GbE on NM-2-10G and quad-10 GbE on NM-4-10G modules, enabling flexible bandwidth scaling.
Q
Do Cisco 3750 network modules support SFP or SFP+ transceivers?
A
Yes; 1 GbE modules support Cisco SFPs (SX, LX, ZX, LRM) and 10 GbE modules accept Cisco SFP+ optics for multimode or single-mode links.
Q
How do I upgrade the uplink module on a Catalyst 3750 switch?
A
Remove the existing module after powering down, insert the new module, then update the IOS image to a version that supports the new hardware and reboot.
Q
What is the maximum throughput of the Catalyst 3750 network modules?
A
The backplane supports up to 32 Gbps per slot; individual module throughput varies—1 GbE modules deliver 2 Gbps aggregate, while 10 GbE modules deliver 40 Gbps aggregate.
Q
Are PoE capabilities affected by adding a network module?
A
No; network modules operate independently of PoE power budgets, so PoE+ and PoE++ on access ports remain fully available.
Q
Do I need a special license for Cisco 3750 network modules?
A
No hardware license is required, but advanced feature sets (IP services, Security) may require corresponding IOS licenses already supported on the 3750.
Q
How do I verify the network module installation on Catalyst 3750?
A
Use CLI commands such as show module, show inventory and show version to confirm module model, serial number and operational status.
Q
Can I stack Catalyst 3750 switches with different network modules?
A
Yes; mixed-module stacks operate normally, though Cisco recommends identical modules for predictable uplink performance and uniform feature support.
Q
What are the power requirements for Cisco 3750 network modules?
A
Modules draw under 15 W each from the switch midplane; no external power supply is needed beyond the Catalyst 3750 chassis PSU.
Q
How do I troubleshoot a failed network module on Catalyst 3750?
A
Check system logs (show logging), reseat the module, verify IOS support, replace transceivers, and if needed resequence power or swap modules to isolate faults.
Q
Which Cisco IOS versions support the Catalyst 3750 network modules?
A
Recommended releases are IOS 12.2(55)SE and later or IOS 15.0(2)SE and above, which include full feature and hardware support for all NM-X modules.
Q
How many network modules can I install in a single Catalyst 3750 switch?
A
Each Catalyst 3750 chassis supports one network module per switch in its dedicated expansion slot; ensure you select the correct slot for your model series.
