Uplink ports and access ports are two different types of switch ports with distinct purposes in Ethernet networking. Here's a clear breakdown of the differences:
Study Plan
2110 Topo
Uplink ports and access ports are two different types of switch ports with distinct purposes in Ethernet networking. Here's a clear breakdown of the differences:
| Aspect | Access Port | Uplink Port (Trunk Port) |
|---|---|---|
| Primary Purpose | Connects end-user devices (PCs, printers, IP phones, cameras, etc.) | Connects switches to other switches, routers, firewalls, or servers carrying multiple VLANs |
| VLAN Membership | Belongs to a single VLAN only | Usually carries multiple VLANs (configured as a trunk) |
| Frame Tagging | Sends and receives untagged frames (no 802.1Q VLAN tag) | Sends and receives tagged frames (802.1Q); may have a native (untagged) VLAN |
| 802.1Q Tagging | Disabled (access ports do not add or expect tags) | Enabled (tags added/removed as needed) |
| Typical Speed | Often 1 Gbps (or matches device speed) | Usually higher: 10G, 25G, 40G, 100G+ to avoid inter-switch bottlenecks |
| Common Use Case | Workstation → wall jack → switch | Switch-to-switch, switch-to-core router, switch-to-firewall |
| Default Mode (Cisco) | Access mode by default | Explicitly configured as trunk (or auto-negotiated) |
| Spanning Tree | Typically an edge port (PortFast enabled) | Usually a non-edge port (carries control traffic) |
| Example Configuration (Cisco) | switchport mode access switchport access vlan 10 |
switchport mode trunk switchport trunk allowed vlan 10,20,30 |
| Visual Analogy | Apartment door: one household (VLAN), packages arrive without labels | Building elevator: carries many households (VLANs), each package has a floor label (tag) |
| Modern Notes |
|
|
| In Short | Single VLAN, untagged, end devices | Multiple VLANs, tagged (trunk), inter-switch links |
