And assumes that the data rate of the host returning traffic on the
symmetric path is within your switchover budget. And what if traffic
is unidirectional?
Dino
On Nov 25, 2008, at 10:34 AM, Luigi Iannone wrote:
William Herrin wrote:
On Mon, Nov 24, 2008 at 11:15 PM, Robin Whittle <[EMAIL PROTECTED]>
wrote:
By contrast, a multiple-LOC multihomed host could detect the
failure
of one of its LOCs (the one associated with the failed link)
within a
few hundred milliseconds and switch to using just the LOCs which
still
work. Detection is straightforward: if you're round-robining
through
the available LOCs as you send packets, the failed LOC sets are the
ones that stop reliably returning responses.
I can't see how every multihomed host could be required to
continually test reachability with extra packets, or that it would
be
good to have each host sending out packets through multiple ISP
links
as a means of detecting an outage.
Who said anything about sending extra packets? The payload packets
are
the test. The acks (or their absence) are the response to the test.
This if you assume symmetric traffic (e.g., TCP) and symmetric routing
(i.e., A -> B = B -> A).
IMHO you can't make this assumption.
Cheers
Luigi
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