The uBR924 is a DOCSIS compatible modem which will receive its configuration
from a CATV service provider. While it is a router, the default operation is
as a non intelligent bridge (no spanning tree). Generally you will not be
able to use any local configuration. The console port can even be disabled
remotely as part of the downloaded configuration.
A short synopsis of a cable modem registration:
1.Cable modem powers up
2.Cable modem listens for a Down Stream HF Signal
3.Aquiring DS signal it then power ranges ( adjust power )
4.Waits for Message telling what Upstream Frequency to adjust to
5.Waits for Message with Free Request Slots
6.On to standard IP DHCP process
7.DHCP provides: name of download config file, TFTP server address, DHCP
address, possibly TOD address(TOD has to be there for CISCO to work)
8.Downloads config file
9.Modem now online and Starts passing PC DHCP info.
This is not an exhaustive list of what takes place but you should get the
idea.
The Cable company has control of your configuration. I suggest you contact
them and see if you have an account and they have added you to the database
so your system will be recognized. There are security issues that I have not
gone into.
Cisco offers a class: "Introduction to Cisco Cable Routers" which covers
both the uBR900 series and CATV side router 7223/7246.
Mike Mizzoni
Yesterdays Memories, Inc.
Consultant, Instructor
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Taylor, Don
> Sent: Wednesday, August 09, 2000 4:10 AM
> To: [EMAIL PROTECTED]
> Subject: Cable router question
>
>
> I recently got a uBR924 and am attempting to use it with the @Home cable
> service. Anybody have any experience with this?
>
> According to CCO, the router should be somewhat self-configuring.
> What I see
> is that the cable interface shows up/down, regardless of whether the cable
> line is even plugged in. Is this normal? Also, I've attempted to
> remove the
> default bridge-group and enable IP routing, but the router doesn't keep
> these changes after a reboot, though it keeps all other changes I make.
>
> I'm just about to call TAC, but I'd rather figure it out for myself with a
> little nudging from groupstudy. Anyone got any hints for me?
>
> - Don
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