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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