Before discussing console servers, you must understand how a single console port is used. Console ports on a switch allow users to access the Command Line Interface (CLI) and to configure the switch. Using a cable and physical access to the switch, users can configure the system right out of the box. A computer with an installed terminal emulator is required.
Ethernet switches generally require VLANs, IP addresses, security, and other settings to properly communicate with the network. The console port may be used to make these initial settings before adding a switch to the existing Ethernet network.
Most switches have a console port as shown in Table 3. A console port cable usually ships in the box with the switch that enables you to connect the switch directly into your workstation for initial configuration. For switches that do not ship with a cable, standard serial cables are typically used.
The Connecting a single switch section discusses how to connect to a single switch using its console port. The same information is needed when deploying a console server. The Using a console server section discusses how to set up a console server. The table below shows the capabilities of each method.
Feature | Console port (local access) | Console server (over the network) |
Accessible when the managed device has power | ||
Operates during POST | ||
View logs during boot | ||
OOB network | ||
Uses the serial console ports of managed devices | ||
Ideal for out-of-the-box, local configurations | ||
Accessible without an Ethernet network | ||
No console server required | ||
SSH and Telnet may be supported | ||
HTTP and HTTPS may be supported | ||
Provides one-to-many access to managed devices | ||
Ideal for long-term access to managed devices | ||
Remote management of devices |
Some switches (with or without a console port) can be preconfigured with an IP address, or have DHCP enabled to allow users to begin configuring the switch with IP, bypassing the initial need for a console port. Check the documentation that came with your device for more information.