Thus spake "Perry Lorier" <[EMAIL PROTECTED]>
Templin, Fred L wrote:
Disagree - PMTU probing is a unidirectional endeavor since the path
from A->B may have completely different characteristics than B->A.
But this isn't on a path, it's on the same L2. L2 traditionally is a
spanning tree, or broadcast media so the assumption seems to hold.
While asymmetric paths are common on a L3 path, they are rare on L2.
Spanning trees are most common at L2, but there are certainly media where we
need to probe in both directions, particularly rings and tunnels. Might as
well probe for all media since (a) it makes things clearer, and (b) an
arbitrary 802.3 host has no way to know if its packets are being bridged to
or tunneled over non-802.3 networks.
S
Stephen Sprunk "Those people who think they know everything
CCIE #3723 are a great annoyance to those of us who do."
K5SSS --Isaac Asimov
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