Product Overview
The MikroTik CRS328-4C-20S-4S+RM is a high-performance Layer 3-capable switch designed for large organizations and ISPs. Featuring 20× SFP cages (1GbE), 4× SFP+ cages (10GbE), and 4× versatile combo ports (RJ45/SFP), it delivers unmatched flexibility for both fiber and copper networking.

Powered by the Marvell 98DX3236 switch chip (800 MHz) with 512 MB RAM, this switch excels in VLAN management, packet forwarding, traffic segmentation, and advanced data plane operations. Its non-blocking architecture ensures all ports run at full speed without congestion, while security and monitoring features like ACLs, Port Security, Port Mirroring, STP/RSTP/MSTP, and IGMP Snooping guarantee stability and visibility in large-scale deployments.

The CRS328 is built for reliability, featuring dual 100–240 V power supplies with failover to prevent downtime, a dedicated RJ45 console port for management, and a durable 1U rackmount chassis. With dual-boot functionality, administrators can choose between RouterOS (advanced routing features) or SwOS (switch-optimized OS).

Key Features

• Flexible Connectivity:
• 20× SFP cages (1 GbE)
• 4× SFP+ cages (10 GbE)
• 4× combo ports (RJ45 or SFP)
• High-Performance Switching: Non-blocking Layer 2 with full-speed throughput
• Marvell Switch Chip: Handles data plane tasks with low latency and high efficiency
• Scalability:
• 16K host table
• Supports up to 4,000 VLANs
• Network Resilience & Security:
• STP, RSTP, MSTP loop protection
• ACLs & Port Security for traffic filtering and access control
• Port Mirroring for real-time monitoring
• Advanced Features:
• Jumbo frames for high-performance traffic
• IGMP Snooping for multicast optimization
• IEEE 802.3ad Link Aggregation for faster, more stable connections
• OS Flexibility: Dual boot – choose between RouterOS or SwOS
• Enterprise Reliability: Dual redundant power supplies, failover capability
• Design: Rugged 1U rackmount metal chassis

Hardware Specifications

• Product Code: CRS328-4C-20S-4S+RM
• CPU: 98DX3236A1, 800 MHz
• RAM: 512 MB
• Storage: 16 MB Flash
• Switch Chip: 98DX3236A1
• Ports:
• 20 × SFP (1G)
• 4 × SFP+ (10G)
• 4 × Combo (RJ45/SFP)
• Serial Port: RJ45 Console
• Operating System: RouterOS (License Level 5) / SwOS (dual boot)
• Dimensions: 443 × 200 × 44 mm
• Operating Temperature: -20°C to +60°C
• Max Power Consumption: 43 W
• Supported Input Voltage: 100 – 240 V