Re: find SNMP ifIndex value if hostname and SNMP ifDescr are known

Jean-Marc,

ok. Thank you for explaining this!


regards,
Martin

On 5/15/15, Jurkiewicz Jean-Marc <[email protected]> wrote:
> Hi Martin,
>
> When you work with SNMP, the Index is the "key".
>
> Once you have the Index you can "snmpget" a lot of information regarding
> this Index ( i.e. this Interface).
> There is no way to "invert" the process ( find an Index when you have the
> Description).
>
> http://jmjmon.eu/LaSupervisionDeReseau/SNMP_Mon-V010.pdf will provide you
> more explanations ( in French for the moment)
>
> As you want a "Description" there is no other issue than reading all the
> "Descriptions" and then get the Index referring to the Interface you are
> looking for.
>
> Best regards
>
> JMJ
>
> -----Message d'origine-----
> De : Martin T [mailto:[email protected]]
> Envoyé : mercredi, 13. mai 2015 10:40
> À : Jurkiewicz Jean-Marc
> Cc : [email protected]
> Objet : Re: find SNMP ifIndex value if hostname and SNMP ifDescr are known
>
> Jean-Marc,
>
> sorry, my mistake. "$" in "grep -E "GigabitEthernet5/26$"" ensures that I
> get the ifIndex of the physical interface.
> snmpwalk/snmpget are run under Linux, SNMP agent runs on Cisco and Juniper
> equipment and language of choice is bash/grep/sed/awk.
> However, the example in my initial post works, but I was looking more like a
> built-in feature in snmpwalk/snmpget, i.e. something which would avoid me
> listing all the "ifDescr" -s first and then greping the right one and doing
> all this parsing.
>
>
> thanks,
> Martin
>
> On 5/12/15, Jurkiewicz Jean-Marc <[email protected]> wrote:
>> Hi,
>>
>> "gsed -r "s/IF-MIB::ifDescr.([0-9]+) .*/\1/"" part is to make sure
>> that I get the ifIndex of the physical interface and not the
>> sub-interface like "GigabitEthernet5/26.123".
>>
>> Isn't that achieved by the "$" in     grep -E "GigabitEthernet5/26$"
>>
>> Some further information would be welcome in order to be able to
>> answer your question.
>> Platform ?
>> Language ? is PERL an option ? AWK  seems the most appropriate when I
>> see your example.
>>
>> Example :
>>
>> [jur466@nocu07 ~]$ snmpwalk -c MyCS  MySwitch
>> 1.3.6.1.2.1.2.2.1.2
>> .1.3.6.1.2.1.2.2.1.2.1 = STRING: GigabitEthernet0/0
>> .1.3.6.1.2.1.2.2.1.2.2 = STRING: Null0
>> .1.3.6.1.2.1.2.2.1.2.3 = STRING: GigabitEthernet1/0/1
>> .1.3.6.1.2.1.2.2.1.2.4 = STRING: GigabitEthernet1/0/2
>> .1.3.6.1.2.1.2.2.1.2.5 = STRING: GigabitEthernet1/0/3
>> .1.3.6.1.2.1.2.2.1.2.6 = STRING: GigabitEthernet1/0/4 Removed lines
>> .1.3.6.1.2.1.2.2.1.2.29 = STRING: GigabitEthernet1/0/27
>> .1.3.6.1.2.1.2.2.1.2.30 = STRING: GigabitEthernet1/0/28
>> .1.3.6.1.2.1.2.2.1.2.31 = STRING: GigabitEthernet1/0/29
>> .1.3.6.1.2.1.2.2.1.2.32 = STRING: GigabitEthernet1/0/30
>> .1.3.6.1.2.1.2.2.1.2.33 = STRING: GigabitEthernet1/0/31
>> .1.3.6.1.2.1.2.2.1.2.34 = STRING: GigabitEthernet1/0/32 Removed lines
>>
>>
>> Then
>>
>> [jur466@nocu07 ~]$ snmpwalk -c MyCS  MySwitch          1.3.6.1.2.1.2.2.1.2
>> |
>> grep GigabitEthernet1/0/3$
>> .1.3.6.1.2.1.2.2.1.2.5 = STRING: GigabitEthernet1/0/3	==>> does not
>> return
>> GigabitEthernet1/0/3x
>> [jur466@nocu07 ~]$
>>
>>
>> Split the line
>> .1.3.6.1.2.1.2.2.1.2.5 = STRING: GigabitEthernet1/0/3
>>
>> By "="
>>
>> Removes spaces => .1.3.6.1.2.1.2.2.1.2.5
>>
>> Spilt by "." (dot)
>>
>> The last element of the table is the index
>>
>> Regards
>> JMJ
>>
>> -----Message d'origine-----
>> De : Martin T [mailto:[email protected]] Envoyé : mardi, 12. mai 2015
>> 17:45 À : [email protected]
>> Objet : find SNMP ifIndex value if hostname and SNMP ifDescr are known
>>
>> Hi,
>>
>> Is there a clever method to find out the SNMP ifIndex value if I know
>> the hostname of the network device and ifDescr for this particular
>> interface? At the moment I do it like this:
>>
>> snmpwalk -v 2c -c public router ifDescr | grep -E
>> "GigabitEthernet5/26$" | gsed -r "s/IF-MIB::ifDescr.([0-9]+) .*/\1/"
>>
>> "router" is the hostname and "GigabitEthernet5/26" is the ifDescr.
>> "gsed -r "s/IF-MIB::ifDescr.([0-9]+) .*/\1/"" part is to make sure
>> that I get the ifIndex of the physical interface and not the
>> sub-interface like "GigabitEthernet5/26.123".
>>
>>
>> thanks,
>> Martin
>>
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