C9300-NM-4M - Cisco C9300 4 x mGIG Module

Cisco C9300-NM-4M — Catalyst 9300 4× Multigigabit Network Module

What it is

C9300-NM-4M is an expansion network module for the Cisco Catalyst 9300 Series switches.
It adds 4 multigigabit Ethernet ports (mGIG) to a compatible 9300 chassis, providing flexible support for 1G, 2.5G, 5G, or 10G speeds (depending on switch hardware and cabling) — ideal for connecting high-speed endpoints and aggregating wireless backhaul traffic.

Why buyers pick C9300-NM-4M (plain English)

Flexible multigig speeds
Supports 1G/2.5G/5G/10G rates over copper, letting you match endpoint speeds (like Wi-Fi 6/6E APs and workstations) without replacing hardware.

Modular expandability
Installs in the Catalyst 9300’s network module slot, adding more high-speed access without swapping the whole switch.

Optimized for densifying access
Great for connecting multigig capable devices — especially in high-density enterprise access layers.

Catalyst IOS-XE integration
Managed with the same IOS-XE feature set as the base switch, enabling consistent policies and visibility.

Performance where you need it
Keeps high-speed traffic off the access plane while preserving overall uplink capacity.

60-second spec box (C9300-NM-4M)

Module type
Network module for Catalyst 9300

Ports
4 × multigigabit Ethernet (RJ-45)

Speed support
1G / 2.5G / 5G / 10G (platform and cabling dependent)

Connector type
RJ-45

Form factor
Catalyst 9300 network module

Managed by
Cisco IOS-XE

Use case
High-speed connection for APs, servers, or aggregation at the access layer.

Where it fits (and when to choose something else)

Perfect for:

• Catalyst 9300 switches needing extra multigig ports

• Wi-Fi 6/6E AP backhaul and high-speed desktop connectivity

• Campus/edge access with variable link rates

• Environments where copper remains the preferred medium

Choose something else if:

• You need fiber optics → SFP/SFP+ uplink modules

• You need 40G/100G uplinks → higher-speed network modules

• You want fixed multigig ports → upgrade to a model with built-in mGIG

TL;DR

C9300-NM-4M is Cisco’s 4× multigigabit expansion module for Catalyst 9300 switches:
a flexible way to add 1-10Gb variable-rate copper connectivity for high-speed devices in enterprise access deployments.