Re: lost interface ID on Linux machine

Thanks, rely the ID (ifIndex ) is change when the interface is down.
this case occur on linux machine and more some others device.




Em 23 de abril de 2012 06:04, Joel Hansell <[email protected]> escreveu:
> Hi,
>
> By "ID number", I assume that you mean the ifIndex?
>
> The ifIndex is not guaranteed to be persistent over reboots, and this
> is a quite common occurence. The relevant RFC text is below:
>
> "Its value ranges between 1 and the value of ifNumber.  The
>        value for each interface must remain constant at least from
>        one re-initialization of the entity's network management
>        system to the next re-initialization."
>
> In other words, the ifIndex numbering of the interfaces is only
> guaranteed to persist until the machine is re-booted.
> But surely, if you want to know which interface is which, you can just
> inspect the ifDescr field instead?
>
> As an aside, some systems seem to be able to have ifIndex persistence
> enabled, like some Cisco equipment:
> http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080134eec.shtml
>
> Regards,
> Joel Hansell
>
> On Mon, Apr 23, 2012 at 4:47 AM, Usuário do Sistema <[email protected]> wrote:
>> Hello, I have a CentOS 5.4 Linux machine and I'm monitoring by snmp it
>> interfaces ethernet. but, when the machine it is restart ID number
>> snmp that's interfaces are change.
>>
>> for exemplo when the linux machine is with ID 3 on interface eth1 and
>> it is reset so it come up with a different ID for exemplo 2 for eth1.
>>
>> so I wonder why happen ? it's normal ? it's possible set a ID value
>> for every interface ?
>>
>> if is change the ID number for each interface so stop my monitoring
>> because my snmp software read by interface ID.
>>
>>
>> thanks
>>
>> ------------------------------------------------------------------------------
>> For Developers, A Lot Can Happen In A Second.
>> Boundary is the first to Know...and Tell You.
>> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
>> http://p.sf.net/sfu/Boundary-d2dvs2
>> _______________________________________________
>> Net-snmp-users mailing list
>> [email protected]
>> Please see the following page to unsubscribe or change other options:
>> https://lists.sourceforge.net/lists/listinfo/net-snmp-users
>
> ------------------------------------------------------------------------------
> For Developers, A Lot Can Happen In A Second.
> Boundary is the first to Know...and Tell You.
> Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
> http://p.sf.net/sfu/Boundary-d2dvs2
> _______________________________________________
> Net-snmp-users mailing list
> [email protected]
> Please see the following page to unsubscribe or change other options:
> https://lists.sourceforge.net/lists/listinfo/net-snmp-users

------------------------------------------------------------------------------
For Developers, A Lot Can Happen In A Second.
Boundary is the first to Know...and Tell You.
Monitor Your Applications in Ultra-Fine Resolution. Try it FREE!
http://p.sf.net/sfu/Boundary-d2dvs2
_______________________________________________
Net-snmp-users mailing list
[email protected]
Please see the following page to unsubscribe or change other options:
https://lists.sourceforge.net/lists/listinfo/net-snmp-users