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Angela,
This
is an intesting question and is sort of the tip of an iceberg
(pardon the cliché - I feel the answer to this question
is loaded)
There
are fundamentally 2 issues here. Misrouting of packets due
to
errors and corruption of the payload.
IMHO,
packets whose headers are corrupted must be discarded
in
order to prevent misrouting. The question is whether the
misrouting
prevention is limited between RPR MACs or to the
ultimate destination
entity
connected to a RPR MAC. I am assuming that a RPR MAC has
multiple clients.
Certain services require persistent delivery of frames.
Such services
will
make their won decision on what to do with corrupted frames.
For
these services it may require that corrupted frames be still
delivered
to the
specific MAC client.
Now,
it maybe of significant value in debugging networks and from
an
operational perspective to know over which span on the ring
the
frame
got corrupted. Hence CRC recomputation at every node may
have
some value from an operational perspective. Also, since the
TTL
field
is part of the frame CRC recomputation cannot be avoided at least
for
the
header.
raj
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