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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? -J -- James Jun TowardEX Technologies, Inc. Technical Lead Boston IPv4/IPv6 Web Hosting, Colocation and [email protected] Network design/consulting & configuration services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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