North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Rapidly-variable routing on the time scale of seconds to minutes?
> On Mon, Jan 31, 2005 at 09:59:39PM -0500, Charles Shen wrote: > [ snip ] > > > > >From the responses, the answer to "the rapidly-variable routing on > > >the time > > scale of seconds to minutes" seems to be: > > > > 1. It could be link layer load balancing, with the two interfaces > > belonging to the same router. 2. It could be per-flow load > balancing > > where flows are defined via both L3 and L4 info, so > traceroute probe > > could not reflect the truth. > > > > My question is then: would it be safe to argue that the above two > > causes explain all (or most of?) the observed "fluttering" routers? > > (some examples listed below) What we are concerned about is > > per-packet load balancing (packets in the same flow go through > > different paths), which will cause trouble to protocols > that install > > state information in routers along the flow path. > > AFAIK, multiple routers showing up in a single-hop in > traceroute response is a sign of packet-by-packet load > balancing, not flow based. > > I could be wrong, though this was my past observation. > > P.S.: What router-interacting applications are you using? > I am talking about e.g. QoS reservation signaling applications.
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