Hello Áki Hermann,
Le 08/04/2014 01:45, Áki Hermann Barkarson a écrit :
>
> [...]
>
> To learn more about this I want to create my own MIB and I have an
> enterprise OID (1513) that I can use.
>
> So I send traps with SNMPv2-SMI::enterprises.1513.... and passing
> along some variable and this is where I'm struggling with syntax and
> general lack of understanding. I want to format my mib in the correct
> way..
I wrote mibs a few years ago, and I think I can give you some advice,
but probably I will forget things, and maybe I will be wrong on some
points. I hope others would correct me if needed.
> maybe it should be split down into one mib defining objects and
> then I define the notifications in another mib..
I believe it is not necessary to write two separate mibs.
> and and.. so many
> questions :) I can see various examples out there but I'd love to
> have a conversation with someone who actually knows this stuff.
>
>
> This is what I have so far:
>
>
> Advania-Traps-MIB DEFINITIONS ::= BEGIN
Ok.
>
> IMPORTS
> enterprises FROM RFC1155-SMI
This is the old deprecated SMIv1 version of the SNMP syntax. You
should import enterprises from SNMPv2-SMI instead, and don't forget
the ';' at the end of the IMPORTS clause.
But also, you need to import the OBJECT-TYPE, DisplayString and
NOTIFICATION-TYPE that you use, and the MODULE-IDENTITY macro that
you ought to use. ;-)
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
DisplayString, enterprises FROM SNMPv2-SMI;
>
> advania OBJECT IDENTIFIER ::= { enterprises
> 1513 }
I think that advania could be defined to be the one and only
MODULE-IDENTITY of the mib, especially if this mib will be the
only one (or the main) mib under enterprises 1513.
Though, I prefer not taking the responsibility of this choice.
You may read the standard, and wait for other answers, before
deciding what to do.
<http://tools.ietf.org/html/rfc2578#section-5>
<http://tools.ietf.org/html/rfc2578#section-5.6>
> objects OBJECT IDENTIFIER ::= { advania 1 }
> notifications OBJECT IDENTIFIER ::= { advania 2 }
Unless you are absolutely sure that the traps will never been generated
using SNMPv1 protocol but only SNMPv2c or SNMPv3 -- and even if you are
sure of that -- it would be highly desirable that you define a prefix
with a sub-id having the value zero for the notifications :
<http://tools.ietf.org/html/rfc2578#section-8.5>
Hence :
objects OBJECT IDENTIFIER ::= { advania 1 }
notifications OBJECT IDENTIFIER ::= { advania 2 }
notificationsPrefix OBJECT IDENTIFIER ::= { notifications 0 }
>
> -- Objects
>
> trapState OBJECT-TYPE
> SYNTAX DisplayString (SIZE (0..31))
> MAX-ACCESS read-write
> STATUS current
> DESCRIPTION
> "A brief description."
> ::= { msg 1 }
{ objects 1 } I suppose
>
> shortMsg OBJECT-TYPE
> SYNTAX DisplayString (SIZE (0..31))
> MAX-ACCESS read-write
> STATUS current
> DESCRIPTION
> "A brief description."
> ::= { msg 1 }
{ objects 2 } I suppose
>
> longMsg OBJECT-TYPE
> SYNTAX DisplayString (SIZE (0..1279))
I'm not sure whether it is allowed to redefine a DisplayString with
a maximum size greater than 255. What is the opinion of other readers
of this mailing list ?
> MAX-ACCESS read-write
> STATUS current
> DESCRIPTION
> "Detailed info."
> ::= { msg 2 }
{ objects 3 } I suppose
Also, if these objects are not actual objects than can be read
and written independently of traps, the MAX-ACCESS should
probably be accessible-for-notify and not read-write.
>
>
> -- Notifications
>
> customTrap NOTIFICATION-TYPE
> STATUS current
> VARIABLES { trapState, shortMsg, longMsg }
> DESCRIPTION "Custom trap alert."
> ::= { notifications 1 }
{ notificationsPrefix 1 }
(see above, about the required zero subid)
>
> END
>
> Not sure if this is how it's meant to be formatted, any help would be
> appreciated..
I hope other answers will follow mine.
Best regards,
--
Olivier Miakinen
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