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Switch Port Count and Oversubscription Calculator

Pick a switch to see its ports by speed as the maker lists them, choose which ports carry uplinks, and get the oversubscription ratio: access bandwidth over uplink bandwidth.

Ports by speed
PortsHow manyUsed as uplinksAccess bandwidth
10 GbE220 Gbps
100 GbE320 Gbps
Access, 2 ports
20 Gbps
Uplinks, 32 ports
3,200 Gbps
Oversubscription
0.01:1

Switching capacity, as the maker states it: 6.4 Tbps

10 GbE: 2 ports: Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46; page 2, Model Overview). 7050CX3-32C : 32x 100G QSFP100 ports, 2 SFP+ ports

100 GbE: 32 ports: Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46; page 2, Model Overview). 7050CX3-32C : 32x 100G QSFP100 ports, 2 SFP+ ports

Switching capacity: Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46; page 2, Model Overview). wire speed throughput of up to 6.4 Tbps bi-directional

How it works

The ports are the maker's own groups: how many ports the switch has at each top speed. Only the groups listed are counted: a management or console port, a module the switch does not ship with, or a second small group of uplink ports is left out.

Choose how many ports of each group carry uplinks. To start with, every port of the fastest group does.

Access bandwidth is the access ports times their top speed, and uplink bandwidth is the uplink ports times theirs. The ratio is the first over the second: above 1:1, the access ports together can offer more traffic than the uplinks carry at once.

Sources

  1. Arista 7050X3 Series Data Sheet, Arista Networks (Sept 4, 2026 03-0040-46). Model Overview (pages 2 and 3); Technical Specifications, Specifications tables (pages 8 and 9)
  2. Arista 7280R3 Series Data Sheet, Arista Networks (August 11th, 2025 03-0045-59). Model overview (page 4); Technical Specifications, Model Comparison for 7280SR3-48YC8, 7280SR3K-48YC8, 7280SR3K-48YC8A (page 13)
  3. Cisco Catalyst 2960-X and 2960-XR Series Switches Data Sheet, Cisco (Updated November 5, 2021). Table 2 (PoE and PoE+ power capacity); Table 4 (2960-X Series configurations); Table 13 (performance); Table 15 (mechanical specifications); Table 21 (Power consumption)
  4. EX2300 Switch Hardware Guide, Juniper Networks (Published 2025-08-12). EX2300 Switches Hardware Overview (guide pages 5 to 9 and 14); Table 3: Physical Specifications of the EX2300 Switch Chassis; Table 14: Power Consumed by EX2300 Switches
  5. EX3400 Switch Hardware Guide, Juniper Networks (Published 2026-01-09). EX3400 Switches First View; Front Panel of an EX3400 Switch; Table 3: Physical Specifications of the EX3400 Switch Chassis; Table 11: Power Consumed by EX3400 Switches
  6. EX4300 Switch Hardware Guide, Juniper Networks (Published 2025-08-12). 24-Port and 48-Port EX4300 Switches; Table 8 (shipped components); Table 10 (physical specifications); Table 32 and Table 34 (N+0 AC power calculations)
  7. Brocade ICX 6610 Switches Data Sheet, Ruckus Wireless (Brocade ICX) (Copyright 2017 Ruckus Wireless, Inc.; 17-8-C). Brocade ICX 6610 Feature and Model Comparison (page 6)
  8. RUCKUS ICX 7150 data sheet, CommScope (RUCKUS Networks) (PA-114000.5 (11/25)). RUCKUS ICX 7150 Product Series (page 4); RUCKUS ICX 7150 Feature/Model Comparison (pages 6 and 7); ordering information
  9. Ruckus ICX 7250 Switch Hardware Installation Guide, Ruckus (ARRIS) (Part Number 53-1003898-08, Publication Date 25 January 2019). TABLE 2 ICX 7250 models (page 13); Power supply usage, TABLE 7 (pages 20 and 21); Weight and physical dimensions (pages 96 and 97); Power consumption (maximum configuration) (page 100)
  10. Ruckus ICX 7750 Switch Data Sheet, RUCKUS Networks (CommScope) (PA-113853.1-EN (04/20)). Ruckus ICX 7750 Feature/Model Comparison (pages 6 and 7)

Checked against the makers' documents on November 5, 2026.

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