http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1455
------- Comment #5 from guy@xxxxxxxxxxxx 2007-04-10 09:07 GMT -------
IEEE Std 802.1AB-2005 says:
G.2.2 PMD auto-negotiation advertised capability field
The PMD auto-negotiation advertised capability field shall contain an integer
value as defined by the
ifMauAutoNegCapAdvertisedBits object in IETF RFC 3636.
RFC 3636 says:
ifMauAutoNegCapAdvertisedBits OBJECT-TYPE
SYNTAX BITS {
bOther(0), -- other or unknown
b10baseT(1), -- 10BASE-T half duplex mode
b10baseTFD(2), -- 10BASE-T full duplex mode
b100baseT4(3), -- 100BASE-T4
b100baseTX(4), -- 100BASE-TX half duplex mode
b100baseTXFD(5), -- 100BASE-TX full duplex mode
b100baseT2(6), -- 100BASE-T2 half duplex mode
b100baseT2FD(7), -- 100BASE-T2 full duplex mode
bFdxPause(8), -- PAUSE for full-duplex links
bFdxAPause(9), -- Asymmetric PAUSE for full-duplex
-- links
bFdxSPause(10), -- Symmetric PAUSE for full-duplex
-- links
bFdxBPause(11), -- Asymmetric and Symmetric PAUSE for
-- full-duplex links
b1000baseX(12), -- 1000BASE-X, -LX, -SX, -CX half
-- duplex mode
b1000baseXFD(13), -- 1000BASE-X, -LX, -SX, -CX full
-- duplex mode
b1000baseT(14), -- 1000BASE-T half duplex mode
b1000baseTFD(15) -- 1000BASE-T full duplex mode
}
RFC 1906 says:
(3) When encoding an object whose syntax is described using the BITS
construct, the value is encoded as an OCTET STRING, in which all
the named bits in (the definition of) the bitstring, commencing
with the first bit and proceeding to the last bit, are placed in
bits 8 to 1 of the first octet, followed by bits 8 to 1 of each
subsequent octet in turn, followed by as many bits as are needed of
the final subsequent octet, commencing with bit 8. Remaining bits,
if any, of the final octet are set to zero on generation and
ignored on receipt.
ITU-T Recommendation X.690 says:
6.2 For the purposes of this Recommendation | International Standard only, the
bits of an octet are numbered from
8 to 1, where bit 8 is the "most significant bit", and bit 1 is the "least
significant bit".
>From this, I conclude that bOther is the MSB of the first octet, b10baseT is
the next octet down, and so on. That would make a field value of 0x0136 as
being:
b100baseT2FD, bfdxSPause, bfdxBPause, b1000baseXFD, b1000baseT
I.e., at least as I read the standards in question, Wireshark is dissecting the
packet correctly, and if that's not what the folks at Avaya intended, they
misread the standard.
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