On 28 June 2011 11:04, venkatgiri <venkatgir...@globaledgesoft.com> wrote:
> As per RFC 1212 section 5.1.1. Mapping to the SYNTAX clause
>
> (3) An object with BIT STRING syntax containing no more than
> 32 bits becomes an INTEGER defined as a sum; otherwise if
> more than 32 bits are present, the object becomes an
> OCTET STRING, with the bits numbered from left-to-right,
> in which the least significant bits of the last octet may
> be "reserved for future use".
Please note that this is talking about mapping the OSI type "BIT STRING"
into an SNMP equivalent. It does *NOT* refer to the SNMP "BITS" pseudo-type
See RFC 2578, section 7.1.4 for a discussion of the BITS construct
> QUE 1. should we implement the object as OCTET string syntax or BIT STRING
> syntax (if it is of 64bits).
Forget about BIT STRING - it's not relevant here.
Use BITS (which is essentially an octet string)
> QUE 2. example:
> lets take one object xyz
> whose syntax is BITS {
> a(0),
> b(1),
> c(2),
> d(3)
> .....
> A(60)
> B(61)
> --
> F(63)
> }
As an aside those last few names are not valid.
See the final paragraph of section 7.1.4
> Here if the bits from 0 to 19 are set means, how we should set
> i) either from left to right [left = 0th bit(LSB), right(63rd bit (MSB))]
> ii) or from right to left [right = 0th bit(LSB), left(63rd bit (MSB))]
The first eight bits are mapped into the first octet of the string (MSB first),
the next eight bits are mapped into the second octet, and the
remaining three bits are mapped into the top three bits of the
third octet.
See RFC 1906/3417, section 8, item (3)
and/or RFC 3416, section 2.5, para 2 for details.
Dave
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