ISDN is not so cheap in cali unless you can get Centrex..
Brian "Sonic" Whalen
Success = Preparation + Opportunity
On Thu, 31 May 2001, Michael L. Williams wrote:
> Well, having more than one router connected to the same WAN connection
still
> leaves a single point of failure. Where I work, we have hundreds of
remotes
> sites, each of which has 2 routers connected together to the remote LAN
> using HSRP. One router has a frame relay connection, and the other has an
> ISDN dial-back up interface to the same WAN destination (Central Site).
> This way if the primary circuit goes down, the HSRP priority gets reduced
> (even on a subinterface level) until the connection is completely down,
thus
> router 2 then invokes the ISDN dials..... ISDN is cheap, so this sounds
like
> a good method to me for providing redundance without having to mess with
> trying to connect 2 routers to a single WAN connection......
>
> My 2 cents
>
> Mike W.
>
> "Jon" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > I've been reading about designing physical redundancy into networks, by
> > having hot standby devices and using HSRP between them. As an example,
if
> > a site has a single router and a single core switch, these are points of
> > risk. By adding a second core switch and a second router, any hardware
> > failure should be overcome by the standby device taking over. If all the
> > servers and wiring closet switches are multi-homed to both core switches,
> > users shouldn't notice that a fault has occured. (I assume that the loss
> > of a wiring closet switch is acceptable -- perhaps local spares are
> > sufficient).
> >
> > However, if I only have one WAN circuit coming into the facility, it can
> > only be connected to one router at a time, right? So, if the active
> > router fails, how does the WAN connectivity fail over, short of an
> > operator moving the cable to the second router? I'm not trying to
address
> > WAN circuit redundancy or multi-homing, that's a different worm-can to
> > open.
> >
> > Is there some way to have both routers connected to the same WAN circuit?
> > Something along the lines of a WYE-cable that connects both routers to
the
> > demarc connection? Or is this something that the circuit provider would
> > address with their equipement (for a fee, I'm sure)?
> >
> > If this has been hashed over in the past, I couldn't find it in the
> > archives. So, if we've covered this before, could someone share the key
> > search words to locate the discussion?
> >
> > -jon-
> >
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