N5K-C5548UP: How Does Cisco’s Unified Fabric Switch Enhance Data Center Efficiency? What Advantages Does It Offer Over Legacy Models?


Core Architecture & Technical Capabilities

The ​​Cisco Nexus N5K-C5548UP​​ is a ​​10G/FC/FCoE switch​​ designed for ​​unified fabric deployments​​, combining ​​48x SFP+ ports​​ (10G Ethernet or 8/16G Fibre Channel) with ​​4x QSFP+ uplinks​​. Key specifications include:

  • ​Switching Capacity​​: ​​960 Gbps​​ with ​​720 Mpps forwarding rate​​, supporting ​​Unified Port Mode​​ for hybrid Ethernet/FC traffic.
  • ​Protocol Support​​: Native ​​FCoE​​, ​​DCB (Data Center Bridging)​​, and ​​FabricPath​​ for lossless storage convergence.
  • ​Power Efficiency​​: Dual ​​920W hot-swappable PSUs​​ with ​​N+1 redundancy​​, consuming ​​300W typical power​​ in FCoE configurations.

Strategic Advantages in Converged Networks

​Legacy SAN Modernization​

Unlike pure Ethernet switches like ​​N5K-C5672UP​​, the N5K-C5548UP integrates ​​Fibre Channel over Ethernet (FCoE)​​, eliminating separate FC switches in virtualized environments. Its ​​Unified Port Mode​​ allows dynamic allocation of ports for SAN/NAS traffic.

​Scalability & Performance​

  • ​Buffer Management​​: ​​512MB shared memory​​ prevents frame loss during FC traffic bursts.
  • ​Multi-Hop FCoE​​: Supports ​​FIP snooping​​ for secure FCoE connectivity across Layer 2 boundaries.
Feature N5K-C5548UP N5K-C5020P-BA (Legacy)
Port Flexibility 48 SFP+ + 4 QSFP+ 20 fixed 10G + 4 expansion
Max FC Speed 16G 8G
Unified Fabric Support Yes No
Latency (FC) <1 μs ~3 μs

Deployment Scenarios & Operational Challenges

​Hyperconverged Infrastructure Backbones​

The switch’s ​​FCoE support​​ enables direct connectivity to ​​UCS Blade servers​​ and ​​NetApp FAS arrays​​, reducing cabling complexity by 40% in VDI environments.

​Firmware Limitations​

Non-XL variants require ​​NX-OS 5.x​​ for FCoE functionality, with ​​NX-OS 7.x​​ introducing FabricPath support. End-of-life (EOL) announced for ​​2024​​, but ITmall.sale provides firmware patches until ​​2027​​.


Cost-Effective Procurement via ITmall.sale

ITmall.sale offers ​​certified refurbished N5K-C5548UP units​​ at ​**​2,980​∗∗​(852,980​**​ (85% below Cisco’s 2,980​(8520,000 list price), including:

  • ​Lifetime Warranty​​: Covers ​​DS-X6148-SFP+​​ modules and power supplies.
  • ​Tested Compatibility​​: Validated with third-party ​​SFP-10G-SR​​ optics and ​​QLogic 8G FC HBAs​​.
  • ​Immediate Availability​​: Pre-configured with ​​NX-OS 5.2(1)N1(1)​​ for plug-and-play FCoE setups.

FAQs: Critical Implementation Insights

​Q: Can SFP+ ports simultaneously handle Ethernet and FC traffic?​
A: Yes – via ​​Unified Port Mode​​, but requires zoning through ​​Cisco DCNM​​.

​Q: Is FabricPath compatible with traditional spanning-tree protocols?​
A: No – FabricPath replaces STP with ​​IS-IS routing​​ for Layer 2 multipathing.

​Q: What’s the maximum FC distance supported?​
A: ​​16G SWL optics​​ achieve 10km over SMF; ​​16G SFP+​​ limits to 125m over OM4 MMF.


For enterprises modernizing legacy SANs with ​​FCoE convergence​​, the N5K-C5548UP remains a cost-efficient transitional solution. Explore certified inventory and lifecycle support at ​ITmall.sale’s Cisco Nexus portfolio​ to maximize ROI on unified fabric deployments.

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