From: Gregg Malcolm (greggm@xxxxxxxxxxxxx)
Date: Sat Apr 06 2002 - 18:06:44 GMT-3
Folks,
With my lab date rapidly approaching, I'm trying to think of strange scenarios
that might bite me. Here are my two latest :
Suppose that you were asked to bridge a layer 3 protocol across an a few
routers (take IP for example). Scenario would be Enet----R1----more
routers----R2----Enet. You are asked to bridge the two Enet's together for IP
connectivity (they are in the same subnet). DLSW won't work (correct me if
I'm wrong here). My first thought was GRE tunnel and bridge on it using IRB
(GRE will not do bridging). My only guess (and I refuse to even try it) would
be to do IRB on each router across the path (ouch !!)
The other scenario involves both frame and ATM. What if you aren't allowed
access to frame and ATM switches (and the remote devices) and you aren't given
DLCI or PVC/NSAP numbers. Take ATM for example. I know how to do
pvc-discovery (some debug helps to learn the VPI value). What if you are
asked to set up an SVC or use CLIP ? I have no idea how to learn the remote
NSAP address. Finding the prefix of the LS1010 is easy. If the end devices
(routers) supported PNNI (they are UNI), I'm sure I could get the remote NSAP
that way. Any ideas ? Seems to me, if they ask for SVC or CLIP, they must
supply you with the remote NSAP address.
I sure hope I don't see these two.
TIA, Gregg
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