cisco Nexus 3000 Nexus 31108PC-V
The Cisco Nexus 31108PC-V is an enterprise 1U top-of-rack switch providing 48 ports of 10G/25G SFP28 and 6 ports of 40G/100G QSFP28. Featuring non-blocking Layer 2 and Layer 3 switching, deep packet buffering, and full VXLAN EVPN routing, the 31108PC-V provides high throughput and flexible speed migration for enterprise virtualized compute and storage nodes.
Specifications
| Brand | cisco |
|---|---|
| Family | Nexus 3000 |
| Form factor | 1U fixed switch |
| Released | Mar 2016 |
| Downlink ports | 48x 10G/25G SFP28 optical/copper ports |
| Uplink ports | 6x 40G/100G QSFP28 ports |
| Switching throughput | 2.5 Tbps / 1.4 Bpps forwarding capacity |
| Buffer size | Large 16MB shared packet buffer |
| Features | EVPN-VXLAN, SRv6, streaming telemetry, and Python programmability |
Generations
- Previous generation: cisco Nexus 3000 Nexus 3172PQ
- Next generation: Cisco Nexus 9000 Series Nexus 93180YC-FX3
Works together
How the cisco Nexus 3000 Nexus 31108PC-V connects to servers, storage and the network: 3 ways, with the parts and products on each path.
iSCSI and NVMe/TCP over Ethernet
Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.
Servers
Dell PowerEdge R830 2U rack
HPE Edgeline EL1000 1U converged edge system
HPE Edgeline EL4000 1U converged edge system
HPE Superdome Flex Superdome Flex 5U chassis, 4 sockets each, up to 8 chassis
HPE Synergy 660 Gen10 Compute Module full-height compute module
Dell PowerEdge R230 1U rack
Adapters for the server
BCM957414A4142CC Broadcom NetXtreme-E BCM57414 Dual-Port 25GbE SFP28 PCIe 3.0 Ethernet Network Adapter
BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
Storage
Dell Unity XT Unity 300 2U rack
Dell Unity XT Unity 400 2U rack
HPE MSA 2050 2U rack enterprise SAN
Lenovo ThinkSystem DS4200 2U rack
Lenovo ThinkSystem DE2000H 2U rack
Dell PowerVault ME4012 2U rack
Optics
QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
SFP-10G-SR Cisco 10GBASE-SR SFP+ Optical Transceiver
SFP-25G-SR-S Cisco 25GBASE-SR SFP28 Optical Transceiver
File storage (NFS and SMB)
Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.
Servers
- Dell PowerEdge R830 2U rack
- HPE Edgeline EL1000 1U converged edge system
- HPE Edgeline EL4000 1U converged edge system
- HPE Superdome Flex Superdome Flex 5U chassis, 4 sockets each, up to 8 chassis
- HPE Synergy 660 Gen10 Compute Module full-height compute module
- Dell PowerEdge R230 1U rack
Adapters for the server
- BCM957414A4142CC Broadcom NetXtreme-E BCM57414 Dual-Port 25GbE SFP28 PCIe 3.0 Ethernet Network Adapter
- BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
Storage
- Dell Unity XT Unity 300 2U rack
- Dell Unity XT Unity 400 2U rack
Lenovo ThinkSystem DM3000H 2U rack
Lenovo ThinkSystem DM5000H 2U rack
Lenovo ThinkSystem DM7000H 3U rack
Dell Unity XT 380F 2U rack
Optics
- QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
- SFP-10G-SR Cisco 10GBASE-SR SFP+ Optical Transceiver
- SFP-25G-SR-S Cisco 25GBASE-SR SFP28 Optical Transceiver
Hyperconverged cluster
Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.
HCI nodes
Dell VxRail P Series P570F 2U rack (1 node)
HPE SimpliVity 380 Gen10 2U rack
HPE SimpliVity 380 Gen9 2U rack
Lenovo ThinkAgile HX3320 1U rack
Adapters for the server
- BCM957414A4142CC Broadcom NetXtreme-E BCM57414 Dual-Port 25GbE SFP28 PCIe 3.0 Ethernet Network Adapter
- BCM957416A4160C Broadcom NetXtreme-E BCM57416 Dual-Port 10GBASE-T PCIe 3.0 Ethernet Network Adapter
- BCM957504A5041CC Broadcom NetXtreme-E BCM57504 Quad-Port 100GbE QSFP56 PCIe 4.0 Ethernet Network Adapter
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
Optics
- QSFP-100G-SR4-S Cisco 100GBASE-SR4 QSFP28 Optical Transceiver
- SFP-10G-SR Cisco 10GBASE-SR SFP+ Optical Transceiver
- SFP-25G-SR-S Cisco 25GBASE-SR SFP28 Optical Transceiver
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Add up rack power and space rack-density.com
- iSCSI explained mrplanb.com
- Virtualization storage Ledger: scored storage platforms mrplanb.com
- Network monitoring tools compared mrplanb.com
Check compatibility with Cisco
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Cisco has tested with the cisco Nexus 3000 Nexus 31108PC-V.
- Compatibility Cisco UCS Hardware Compatibility List
- Compatibility Cisco Optics-to-Device Compatibility Matrix
- Support Cisco Support and Downloads
Equivalent models from other brands
FAQ
What is the advantage of the large buffer on the 31108PC-V?
The 16MB shared buffer absorbs bursty traffic and Microburst congestion typical of distributed storage and database queries.
Can the 25G ports auto-negotiate to 10G?
Yes, every SFP28 port backward supports standard 10GbE SFP+ optical modules and direct attach copper cables.
Buying or selling Nexus 31108PC-V?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Cisco Nexus 31108PC-V Product Documentation, checked 2026-10-27
- Cisco Nexus 31108PC-V Data Sheet and Technical Specifications, checked 2026-10-27