Re: SNMP variable length string support

On 30/10/2007, thommandra gowtham <[email protected]> wrote:
>  I have a question on SNMP variable length string support. Suppose a MIB
> contains.....


>  LinkName ::=  OCTET STRING (SIZE(1..8))

>  demoEntryString OBJECT-TYPE
>  SYNTAX LinkName .....
>  ::= {demoEntry 2}

>  demoEntry OBJECT-TYPE
       :
>  INDEX {demoEntryString}
>  ::= {demoTable 1}


>  What would be the output of snmpget, snmpwalk and snmpgetnext commands on
> the above demotable?

I presume you are talking about the Solstice Enterprise Agent DEMO-MIB here?
(You don't actually say, and it's definitely not one of ours).

With those tweaks, and a single row indexed by the string "hello",
then the results of walking the table would look something like:

  DEMO-MIB::demoEntryInteger."hello" = down(2)
  DEMO-MIB::demoEntryOid."hello" = SNMPv2-SMI::zeroDotZero


or using numeric OIDs:

  .1.3.6.1.4.1.42.1000.10.1.3.5.104.101.108.108.111 = INTEGER: 2
  .1.3.6.1.4.1.42.1000.10.1.4.5.104.101.108.108.111 = OBJECT ID: .0.0

The instance subidentifiers (i.e. the index) are 5 (the length of the
string), followed by the ascii values of the individual characters
104 ('h'), 101 ('e'), 108 ('l', twice), and 111 ('o').

If the definition of LinkName had been
    LinkName::=  OCTET STRING (SIZE(8))

(i.e. a fixed size), then the length subidentifier isn't needed,
and the response would have been something like

  .1.3.6.1.4.1.42.1000.10.1.3.103.111.111.100.98.121.101.33 = INTEGER: 2
  .1.3.6.1.4.1.42.1000.10.1.4.103.111.111.100.98.121.101.33 = OBJECT ID: .0.0

OK?

Dave

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