SG350X-48-K9 - 48-Port Gigabit L3 Stackable Managed Switch

Cisco SG350X-48-K9: 48 GbE ports, 4x 10G uplinks (2x combo + 2x SFP+), Layer 3 stackable managed switch for growing SMB networks.

The Cisco SG350X-48-K9 is part of the Cisco 350X Series Stackable Managed Switches, designed to deliver rich Layer 3 managed switching capabilities for small and medium-sized businesses at an affordable price point. It provides 48 10/100/1000 Mbps Gigabit Ethernet ports for standard device connectivity plus 4 additional 10 Gigabit Ethernet ports (2x 10GBase-T/SFP+ combo and 2x SFP+) for high-speed uplinks or server connections. The switch supports true physical stacking of up to four units, enabling unified data, control, and management planes across a stack that operates as a single logical entity. With Layer 3 features such as static routing, VLANs, and Access Control Lists (ACLs), plus advanced security like DHCP snooping, IP Source Guard, and Dynamic ARP Inspection, the SG350X-48-K9 is well suited for growing network environments requiring reliable, scalable, and secure switching infrastructure without requiring a large dedicated IT staff.

• Manufacturer: Cisco Systems
• Product Family: Cisco 350X Series Stackable Managed Switches
• Product Series: SG350X
• Model: SG350X-48-K9
• Product Type: Small Business Layer 3 Managed Switch
• Total System Ports: 48x 1G + 4x 10G
• Network Ports: 48x 10/100/1000 Mbps Gigabit Ethernet
• Uplink Ports: 2x 10GBase-T/SFP+ combo + 2x SFP+
• Switching Capacity: 176 Gbps
• Forwarding Rate: 130.94 Mpps (64-byte packets)
• Packet Buffer: 3 MB
• CPU: 800 MHz ARM CPU
• Memory (RAM): 512 MB
• Flash Memory: 256 MB
• MAC Address Table: 16,000 entries
• PoE Support: No PoE (Data Only)
• Power Supply: 100-240V, 50-60 Hz, internal, universal
• Fans: 1
• Stacking: Physical stacking of up to 4 units, unified management
• IPv6 Support: IPv6 host mode, dual IPv4/IPv6 stack, ND, DAD, ICMPv6
• Management: Web-based GUI, CLI, SNMP v2/v3, RMON, SYSLOG
• Security Features: DHCP snooping, IP Source Guard, Dynamic ARP Inspection, Port Security, ACLs
• Energy Efficiency: IEEE 802.3az Energy Efficient Ethernet
• Unit Dimensions: 440 x 44 x 257 mm (17.3 x 1.73 x 10.12 in)
• Licensing: Network Essential
• Warranty: Limited Lifetime Hardware Warranty

• 48 Gigabit Ethernet (10/100/1000 Mbps) ports for broad device connectivity
• 4x 10 Gigabit uplink ports (2x 10GBase-T/SFP+ combo + 2x SFP+) for high-speed backbone links
• True physical stacking of up to 4 units with unified data, control, and management planes
• Layer 3 routing including static routes for inter-VLAN traffic management
• Advanced VLAN support for network segmentation
• Access Control Lists (ACLs) for traffic filtering and security policy enforcement
• DHCP snooping, IP Source Guard, and Dynamic ARP Inspection for network protection
• IEEE 802.3az Energy Efficient Ethernet support for reduced power consumption
• IPv6 support including dual IPv4/IPv6 stack and neighbor discovery
• Comprehensive management via Web GUI, CLI, and SNMP
• Spanning Tree Protocol variants (STP, RSTP, MSTP) for loop prevention
• Quality of Service (QoS) with CoS and DSCP support for traffic prioritization

Designed for small and medium businesses needing scalable, high-speed Layer 3 switching infrastructure.

• Core or aggregation switch for growing SMB office networks
• High-speed backbone connectivity between wiring closets using 10G uplinks
• Stacked deployment for centralized management across multiple switches
• Segmenting traffic across departments using VLANs and ACLs
• Connecting servers or NAS devices via 10GBase-T or SFP+ uplinks
• Branch office network infrastructure requiring Layer 3 routing
• Data center edge switching for SMB-scale server rooms

• High-density 48-port Gigabit connectivity
• Fast 10G uplinks for backbone scalability
• True stacking simplifies multi-switch management
• Layer 3 routing reduces need for separate routers
• Robust security features protect network integrity
• Energy-efficient operation lowers running costs

• Dimensions (W x H x D): 440 x 44 x 257 mm (17.3 x 1.73 x 10.12 in)
• Form Factor: 1U rack-mountable
• Cooling: 1 fan
• Mounting: Rack-mount kit included

Per available documentation, this product is validated for use within the Cisco 350X Series stacking ecosystem and standard Ethernet networking accessories:

• Cisco SG350X-24 series switches (same stacking family)
• Cisco SG350X-48P-K9 (PoE+ variant, same series)
• Cisco SG350X-48MP-K9 (higher-power PoE+ variant)
• Cisco SG350XG-24F/48T stackable switches (same product family)
• Standard Cisco SFP and SFP+ transceiver modules
• Standard 19-inch equipment racks
• 10GBase-T copper and 10GBase-X fiber network infrastructure

Note: Compatibility applies within the Cisco 350X Series stacking architecture; mixing with newer Cisco CBS350 series switches is not confirmed by official documentation.

• Cisco SG350X-48-K9 switch unit
• Power cord
• Rack-mount brackets/kit
• Console cable (RJ-45)
• Documentation/quick start guide

Q: How many ports does the Cisco SG350X-48-K9 have?

A: It has 48 Gigabit Ethernet (10/100/1000 Mbps) ports plus 4 additional 10 Gigabit ports consisting of 2x 10GBase-T/SFP+ combo and 2x dedicated SFP+ uplinks.

Q: Does the SG350X-48-K9 support PoE?

A: No, this model is a data-only switch with no Power over Ethernet support; PoE variants are available as SG350X-48P-K9 and SG350X-48MP-K9.

Q: Can multiple SG350X-48-K9 units be stacked?

A: Yes, the switch supports true physical stacking of up to four units, providing a unified data, control, and management plane across the stack.

Q: What is the switching capacity of this model?

A: The SG350X-48-K9 provides a switching capacity of 176 Gbps and a forwarding rate of 130.94 Mpps for 64-byte packets.

Q: Is the Cisco SG350X-48-K9 still available for purchase from Cisco?

A: Cisco has announced End-of-Sale for the 350X Series, with the last order date set for July 30, 2022; the switch may still be available through distributors and refurbished channels.

Q: What management options does the switch support?

A: It supports Web-based GUI, CLI, SNMP (v2/v3), RMON, and SYSLOG for comprehensive configuration and monitoring.

Q: Does the SG350X-48-K9 support Layer 3 routing?

A: Yes, it includes Layer 3 features such as static routing, VLANs, and Access Control Lists (ACLs) for advanced traffic management.

Q: What security features are included?

A: Security features include DHCP snooping, IP Source Guard, Dynamic ARP Inspection, and Port Security to protect against common network threats.