From: Jay Hennigan (jay@xxxxxxxx)
Date: Tue Oct 24 2000 - 01:47:07 GMT-3
On Mon, 23 Oct 2000, Jack Heney wrote:
> From Cisco's Networkers 2000 CCIE prep seminar:
> When connecting to the rack via RS@#@, an incorrect communications server
> configuration can cost considerable time during the day.
>
> COMMUNICATIONS SERVER:
> hostname RtrA
> !
> line 1 8
> no exec
> modem callout
> transport input all
>
> ATTACHED ROUTER:
> hostname RtrB
> !
> line con 0
> exec-timeout 0 0
>
> Two quick questions:
> 1. Why "no exec" on the comm server?
You don't want noise, boot messages, etc. from the routers to be
misinterpreted as commands by the comm server. The "no exec" is on the
async lines connected to the lab routers to prevent input from those
lines from being executed as commands.
> 2. Is the comm server simply a router with 8 async serial ports? What sort
> of cable is used to connect these to the attached routers' console ports
> (I'm assuming its a rollover rj-45 with an adapter on the comm server)?
Exactly, but no adapter. The comm server is essentially a 2501 with eight
or 16 extra "aux" ports which become the lines. These are a SCSI-style
multi-pin connector for each eight lines that fans out to RJ-45 style
8-pin modular jacks, so just a flat rollover cable between each and the
corresponding router console port.
The comm server's console is connected to the serial interface on the
PC at your workstation, perhaps through an arrangement that allows the
proctor to monitor or take over the connection.
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2500/2509/acs
vrug/
It's a good idea to practice the telnet escape sequences, to hop from
router to router as you'll likely only have one window to work with.
Also, to send a break to a router via the comm server, it's Ctrl-shift-6
followed by "b". Useful for password recovery.
-- Jay Hennigan - Network Administration - jay@west.net NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323
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