Jon,
the answer to your question is NO.
here`s the reason....you COULD make yourself a Y cable from your CSU/DSU
,but you would have a few issues.
I tried this sometime ago and found out the hard way.
OK.first thing ....if both routers are on you have a major routing loop
problem..AKA split horizon/Spanning tree ....both routers would recieve the
input packet from the CSU and both would try to route it at the same
time...(VERY BAD)....i totally screwed up my lab routing by doing this .
Also packets from host to internet are not routed properly...
So i tried HSRP but found that only worked if i had only one VLan and didn`t
load balance.....it also was not as fast as just having one router..( pass
as to why)....
SO you could set-up the cable and say shutdown one int on the backup
router...which still means you have a latency (until you re-enablen the int
and re-convergence takes place).....
i hope this is helpfull...
BTW Please don`t ask me about CSU/DSU clocking as it was a BT leased line
CSU/DSU and all i did was rip the cable apart and duplicate it ...
Sorry
steve
>From: "Jon"
>Reply-To: "Jon"
>To: [EMAIL PROTECTED]
>Subject: Redundancy design question [7:6646]
>Date: Thu, 31 May 2001 15:09:25 -0400
>
>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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