The Routing Over Large Clouds Mailing List Archive by date[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Maybe RSVP and Q.2931, but not NHRP
> > This is getting to be a very confusing thread! Or is it just me? > > > > Why would you need NHRP if you have I-PNNI? I must be missing something. > The short answer is that you need NHRP if you don't know the answer > already. > > 1) Router-Host and Host-Router communication > If you > think of my criteria "use NHRP if you don't know the answer a > priori", and assume that hosts don't run routing protocols, then > it is pretty clear that there will be lots of cases that ATM- > attached hosts need to use NHRP. It seems to me that this is a typical NHRP loop that we need NHRP because we need NHRP. > > 2) Heirarchy. In the presence of Heirarchy, we will abstract out the > > ATM addresses of the lower level routers What is the point of having the same hierarchy for IP and NSAP (ghee) and having different (or, at least, not mechanically mappable) address values for IP and NSAP? Are you aware that the same hierarchy means to have the same address assignment authority? > > 3) Virtual routers - the correct ATM destination for the traffic may not > > actually be the router It's just IP mobility. > > 4) Other routing protocols. Even if some of your routers run I-PNNI, > > you want interoperability with other protocols (including OSPF and BGP.) OSPF and BGP can run with NSAP-compatible addresses. Masataka Ohta
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