Introduction
CONSOLE port is used to configure the switch, so only managed switches only. Also note that not all managed switches are, it is because of a variety of switch configurations, such as through Telnet commands,
Although theoretically, the basic configuration of the switch must pass switch FDDI interfaces, but some brands of the basic configuration of the switch at the factory already configured, such as IP addresses do not need to perform basic configuration of the basic user name and the like, so these managed switches do not provide this switch FDDI interfaces it, and for now still in the majority. Such switches typically only requires some advanced configuration can be a simple way Telnet or Web Java programs.
Of course, there are some switches or switches provide FDDI interface, but note that, Console port for switch configuration switches are not all the same, some use the same router with Cisco RJ-45 type switches FDDI interfaces. While others use the switch as a serial FDDI interfaces.
In addition to the above two Console port switch, there is a common interface is also arranged to switch, that is a 25-pin "D" type connector. Whether the switch using the DB-9 serial interface or DB-25, or the use of RJ-45 interface, the switch during configuration, generally need to be connected via a dedicated line to the Console computer configuration (commonly referred to as terminal) serial port , with different switch adapted to switch FDDI interfaces.
Console line is also divided into two types, one is a serial line, i.e., the serial interface both ends (both ends of the female or male end, the other end of female), Console may be inserted into both ends of each serial port of the computer and the switch; the other two ends are RJ-45 connectors (RJ-45-to-RJ-45) of the flat wire.
Since the flat wire ends are RJ-45 interface can not be connected directly to the computer serial port, therefore, must also use a RJ-45-to-DB-9 (or RJ-45-to -DB-25) adapter. Typically, the switch box are randomly presented in such a line and the corresponding Console DB-9 or DB-25 adapter.
may be carried out generally have a "Console" port [1], which is designed for the switch to configure and manage the network management switch. And configure the switch port through Console, configure and manage the switch is a step that must elapse. Because the configuration otherwise often need the help of IP addresses, domain names or device name can only be achieved, and the new switch is obviously not built to purchase these parameters, the Console port is the most common, basic switch management and configuration port.
Console port position at which the switch is not the same of different types, some of the front panel, while the others are located on the rear panel. Most modular switch is usually located on the front panel, and the fixed configuration switches are located on the rear panel. Above or the side of the port will have a similar "CONSOLE" word identification.
In addition to a different location, type Console port are different, the vast majority of switches are used RJ-45 ports, but a few uses DB-9 serial port or serial port DB-25.
VPN devices are generally provided with a control port "Console", is used to connect a computer or terminal device, to configure the router through a specific software. The port provides an EIA / TIA-232 asynchronous serial interface, to configure the router (the first time must be arranged through the console port) locally.
Console port configuration using a dedicated serial port to connect directly to a computer, local configuration using a terminal emulation program (such as "hyperterminal" under Windows).
troubleshooting
1, repair damaged Console, Console serial port is generally the main board chip control (usually Philips serial controller chip) a, there are four pins (Cosole by line sequential): TxD (transmit), the RxD (receiver), the DSR (transmission ready), the DCD (carrier sense) in the main board and chip check four pins, no problem can be ruled out if a physical failure . Weld most cases, RJ45 PIN is caused by poor contact. 2, bypassing the damaged Console: If found to be caused by physical failure or other reasons difficult to repair, improve the configuration file can be accessed through the AUX port, but did not see the boot process. If the configuration file is accidentally deleted, it was tragic. How to do it? CiscoIOS12.2 above has a feature to automatically configure the router via DHCP, the configuration file on the TFTP server is automatically downloaded to the router. The Ethernet port and VTY password and password re-ENABLE effective, you regain control over the entire router, of course, after the recovery may also enter from the AUX port. It is noteworthy that the DHCP server need to specify the address of the TFTP server, you need to configure the TFTP server option option code 150.