Switch module Cisco Catalyst 3850 4 x 10GE network module C3850-NM-4-10G-RFB

The Cisco Catalyst 3850 4 x 10GE network module expands Catalyst 3850 switches by adding four 10 Gigabit Ethernet ports to support higher uplink and aggregation bandwidth. Designed for environments that require increased throughput, the module integrates with the 3850 platform to provide additional capacity for data-intensive tasks, uplink redundancy and simplified network architecture. It is intended for use in campus distribution, branch aggregation and access layer scenarios where higher-speed connections are needed between switches, routers and servers.

Advantages

The module delivers four native 10 Gigabit Ethernet interfaces, enabling higher throughput and reduced bottlenecks on uplinks. Integration with the Catalyst 3850 platform preserves unified management and familiar configuration workflows, while the compact form factor conserves chassis slot space. By providing multiple high-speed ports in a single module, it supports link aggregation and redundancy strategies to improve availability and performance without requiring a separate aggregator device.

Suitable for

• Uplink and aggregation between access switches and distribution/core layers
• High-bandwidth connectivity for virtualization hosts and server farms
• Campus networks requiring increased uplink capacity and redundancy
• Branch offices needing consolidated high-speed links to data centers

Key specifications

• Number of ports: four 10 Gigabit Ethernet ports
• Port type: 10GE interfaces compatible with standard SFP+ transceivers
• Intended platform: compatible with Cisco Catalyst 3850 series chassis
• Function: uplink/aggregation module to increase switch bandwidth
• Form factor: modular network interface designed for insertion into the host switch

How to use

Install the module into an available network module slot on a compatible Catalyst 3850 switch following Cisco installation procedures and observing electrostatic discharge precautions. After physical installation, populate the ports with appropriate 10GE SFP+ transceivers and connect fiber or DAC cables as required. Configure the switch ports in the device management interface to match network design—assign VLANs, set speed/duplex where applicable, and configure link aggregation, spanning tree or LACP policies according to operational needs.

Usage recommendations

Use industry-standard SFP+ optics or direct-attach cables certified for 10 Gigabit operation and verify transceiver compatibility with the Catalyst 3850 platform. Plan port usage for redundancy and capacity—spread critical uplinks across multiple ports and enable link aggregation where higher throughput or failover is required.