Connecting Cisco Switches Back-to-Back Through the Console Ports

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Cisco
Switches
Hi. I'm trying to find a way to connect 2 Cisco switches (could be 2x2950, 2x3560, or a mix of those) from console port to console port via Reverse Telnet. Any idea if it can be done; if so how can I do it?

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You may need to change the pin in Console cable.
Not sure why you need to do this.

(Does those two switches not connect together. I am guessing)

Just use SSH or telnet.

You can use vlan to separate the data and management interface.
or Private vlan.

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  • Edwardzeng
    You may need to change the pin in Console cable. Not sure why you need to do this. (Does those two switches not connect together. I am guessing) Just use SSH or telnet. You can use vlan to separate the data and management interface. or Private vlan.
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  • Bobkberg
    I think you'd be better off using the AUX port to the other Console port. As for the cable, try using a straight-through cable as opposed to the default cisco rollover cable. As I recall, the pinouts are deliberately built so that it automatically reverses. Like this: Pin Signal 1 RTS 2 DTR 3 TXD 4 Ground 5 Ground 6 RXD 7 DSR 8 CTS That way one of two cables (rollover usually) or straight through will automatically do what you want. I added that qualification because many manufacturers copy the Cisco pinouts (Sun Netras, Juniper, others) and others don't. Bob
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  • Edwardzeng
    yes. I thing AUX can do this. I wondering if you link to console back to back how could you run the program to connect it. Telnet may be the only command in switch which you can access to another host. But I don't think it will reach to the console port by telnet.
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  • Edwardzeng
    yes. I thing AUX can do this. I wondering if you link to console back to back how could you run the program to connect it. Telnet may be the only command in switch which you can access to another host. But I don't think it will reach to the console port by telnet.
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  • Atomas
    Hi. The reason I asked "through console port" is that these switches only have a CON port, no AUX. Tell me if I'm wrong but it's not possible to configure a CON port to act as an AUX port, since no "modem-like" options can be set on that line (CON). Thanks
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  • Burmuse
    You cannot connect two console port back to back. You can connect modem on console port of switch since switch does not have AUX port like routers. Please see Cisco doc#12016 Connecting a Modem to the Console Port on Catalyst Switches for detail. Why? Here is property of console port on Cisco switch: Allowed input transports are none. Allowed output transports are lat pad mop telnet rlogin ssh nasi. On the other hand, VTY ports are.. Allowed input transports are telnet ssh. Allowed output transports are lat pad mop telnet rlogin ssh nasi. Since console port does not accept any input protocols other that serial connection, you cannot talk to console port directly. You may be able to connect two switches via two modems and null modem cable via console ports. But, why you need to bother this set up? There must be very valid and strong reason or you just have too much free time.
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