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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