what is aux port on cisco router?

Question

What is aux port on cisco router used for?

Answer 1

The purpose of the auxiliary port is for connecting to an external modem. Once configured, this modem can be used as a backup demand-dial connection to another location, or as a way to dial in to the router for troubleshooting purposes should regular connectivity fail. Unlike the console port, the auxiliary port supports hardware flow control, which ensures that the receiving device receives all data before the sending device transmits more. In cases where the receiving device’s buffers become full, it can pass a message to the sender asking it to temporarily suspend transmission. This makes the auxiliary port capable of handling the higher transmission speeds of a modem.



Much like the console port, the auxiliary port is also an asynchronous serial port with an RJ-45 interface. Similarly, a rollover cable is also used for connections, using a DB-25 adapter that connects to the modem. Typically, this adapter is labeled “MODEM”.

Answer 2

The AUX port is typically used for dial back-up from a remote location. If the router's primary network interface goes down you can still access the router to troubleshoot from a remote connection by dialing into the phone number associated with the modem. The type of modem required is simply any dial modem that supports the 9600-8-none-one talk standard that the cisco router uses for communication by default.

Answer 3

Aux Port

Answer 4

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RE:

what is aux port on cisco router?

What is aux port on cisco router used for?

Answer 5

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Few people still do dial in to a router, but you are right, it is supported and through the AUX port. The modem itself can theoretically be any modem, but common modems like Hayes work the best. You typically need to set the dip switches on the modem for Auto Answer (AA On) or it will ring and not pick up. You can hook up a modem and try auto-confgure as well: under line aux 0 modem autoconfigure discovery To actually configure to allow dial in (and this is from memory, it is very rare to see it anymore) line aux 0 modem InOut modem autoconfigure type transport input all stopbits 1 speed 115200 Keep in mind the modem settings can differ from country to country. As to the cable, there used to be one with every device, DB25 to RJ45 ... wit hlike 9 ofd the 25 pins actually hot. Good luck!

Answer 6

Practically

Directly access router= use Console port

Remote access = Aux port via Modem(dial in) or telnet/SSH or Console connection to an out band NW Console server

now if Network down and want to access for troubleshooting remotely, either you have to choose Aux Out Band Network or Console connection via Console server.

Answer 7

The auxillary port on a cisco is a way to connect to it in a non-networking way. You can hook into it and configure troubleshoots and such. I believe technichians troubleshoot the routers remotely through the aux port.