So I was testing some stuff in my lab for a friend of mine, and I discovered an alternate use of the AUX port on your Cisco router.
Actually I've always been aware of the AUX port, but only thought it would apply for some modem callback stuff.
Here's a cool way to use your AUX port:
r3#conf t
Enter configuration commands, one per line. End with CNTL/Z.
r3(config)#int loopback 0
r3(config-if)#ip address 10.10.10.10 255.255.255.255
r3(config-if)#no shutdown
r3(config-if)#exit
r3(config)#line aux 0
r3(config-line)#transport input telnet
r3(config-line)#^Z
r3#
r3#sh line
Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 CTY - - - - - 1 0 0/0 -
* 65 AUX 9600/9600 - - - - - 14 2 0/2517358 -
* 66 VTY - - - - - 14 0 0/0 -
67 VTY - - - - - 0 0 0/0 -
68 VTY - - - - - 0 0 0/0 -
69 VTY - - - - - 0 0 0/0 -
70 VTY - - - - - 0 0 0/0 -
Line(s) not in async mode -or- with no hardware support:
1-64
I'll now plugin a rollover cable in the AUX port, and the other end into the console port of some other device (in this case a Cat5)
Now I'll be able to do the following:
r3#telnet 10.10.10.10 2065
Trying 10.10.10.10, 2065 ... Open
Console>
Console> sh ver
WS-C5505 Software, Version McpSW: 6.3(4a) NmpSW: 6.3(4a)
Copyright (c) 1995-2002 by Cisco Systems
NMP S/W compiled on Feb 9 2002, 19:11:26
MCP S/W compiled on Feb 09 2002, 18:56:22
System Bootstrap Version: 5.1(1)
Hardware Version: 1.0 Model: WS-C5505 Serial #: xxxxxxxxx
Mod Port Model Serial # Versions
--- ---- ---------- --------- ----------------------------------------
1 2 WS-X5550 022301142 Hw : 1.2
Fw : 5.1(1)
Fw1: 5.2(1)
Sw : 6.3(4a)
DRAM FLASH NVRAM
Module Total Used Free Total Used Free Total Used Free
------ ------- ------- ------- ------- ------- ------- ----- ----- -----
1 32768K 18662K 14106K 8192K 3910K 4282K 512K 185K 327K
Uptime is 0 day, 5 hours, 30 minute
Pretty nifty, If you need console access to a device that is behind a core-router..