Question on SNMP response (and how to use them)

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

Hi,

I have probably a dumb question, but I'm stuck for the moment and maybe someone has a easy and fast solution for me.

I try to poll a Cisco router SHDSL Interface. I have lots of routers, most of them running in 2-wire or 4-wire mode.

I'm interested in graphing the quality of the links, specially the ATTENUATION and the NOISE MARGIN, also in CRC ERROR tracking ecc.

When I poll the interface for example for the ATTENUATION using the following OID: .1.3.6.1.2.1.10.48.1.5.1.1 I get the following answer

Code:

HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.15.xtuC.customerSide.wirePair1 = INTEGER: 0 dB
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.15.xtuR.networkSide.wirePair1 = INTEGER: 1 dB

for the NOISE MARGIN OID: .1.3.6.1.2.1.10.48.1.5.1.2

Code:

HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrSnrMgn.15.xtuC.customerSide.wirePair1 = INTEGER: 0 dB
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrSnrMgn.15.xtuR.networkSide.wirePair1 = INTEGER: 18 dB

The thing is I'm not interested in the xtuC values, only xtuR as this are the values seen by the router.

Is there a way to "cancel" them out? Maybe by a regex? Someone has an idea for me?

Linegod · **Posted:** Sun Feb 19, 2012 8:58 am

If you post the output from the snmpwalk using the -On option, to display only numeric, I might be able to help.

When you post the plain language output, it is impossible to see if there is a more specific OID you could be calling to get the value you want.

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

here the result of .1.3.6.1.2.1.10.48.1.5.1.2:

Code:

.1.3.6.1.2.1.10.48.1.5.1.2.15.1.2.1 = INTEGER: 0
.1.3.6.1.2.1.10.48.1.5.1.2.15.2.1.1 = INTEGER: 17

while .1.3.6.1.2.1.10.48.1.5.1.1:

Code:

.1.3.6.1.2.1.10.48.1.5.1.1.15.1.2.1 = INTEGER: 0
.1.3.6.1.2.1.10.48.1.5.1.1.15.2.1.1 = INTEGER: 4

the thing is that I'm not interested in the 0 value. But on the other side I can't call directly .1.3.6.1.2.1.10.48.1.5.1.1.15.2.1.1 for example, because if I have a interface working in 4wire mode in this way I will get only the result of one wire.

Linegod · **Posted:** Sun Feb 19, 2012 9:59 am

Why not just create two output entries in your XML, one for the customer side, and one for the network side, then in your graph just remove the one that isn't valid after creation?

Or have two graph templates, and apply the correct one when you create it.

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

mmmmmhhh

my XML file looks like this:

Code:

<interface>
        <name>SHDSL Line Statistics</name>
        <description>Query the SHDSL Attenuation Margin</description>
        <oid_index>.1.3.6.1.2.1.10.48.1.5.1.2</oid_index>
        <index_order>SNRDisp:ATNDisp</index_order>

   <fields>
        <SNRDisp>
                <name>SNR Disp</name>
                <method>walk</method>
                <source>value</source>
                <direction>input</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.2</oid>
        </SNRDisp>
        <ATNDisp>
                <name>ATN Disp</name>
                <method>walk</method>
                <source>value</source>
                <direction>input</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.1</oid>
        </ATNDisp>
        <SNR>
                <name>SNR Margin</name>
                <method>walk</method>
                <source>value</source>
                <direction>output</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.2</oid>
        </SNR>
        <ATN>
                <name>Attenuation</name>
                <method>walk</method>
                <source>value</source>
                <direction>output</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.1</oid>
        </ATN>
   </fields>
</interface>

do you think there is something wrong? I still can't get it to work, my graphs are always empty....

gandalf · **Posted:** Sun Feb 19, 2012 2:38 pm

You did follow the step-by-step procedure for creating a new SNMP data query? See 1st link of my sig and scroll down to that very chapter.
R.

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

Yes I did it now 3 times. Always my graphs are empty. I'm sure it's just a small problem but I can't get it fixed.

This is what a rrd looks like:

.....

Code:

rrd_version = "0003"
step = 60
last_update = 1329850046
ds[atn_value].type = "COUNTER"
ds[atn_value].minimal_heartbeat = 120
ds[atn_value].min = 0.0000000000e+00
ds[atn_value].max = NaN
ds[atn_value].last_ds = "U"
ds[atn_value].value = NaN
ds[atn_value].unknown_sec = 28
ds[snr_value].type = "COUNTER"
ds[snr_value].minimal_heartbeat = 120
ds[snr_value].min = 0.0000000000e+00
ds[snr_value].max = NaN
ds[snr_value].last_ds = "U"
ds[snr_value].value = NaN
ds[snr_value].unknown_sec = 28
rra[0].cf = "AVERAGE"
rra[0].rows = 500

As already told above the result of the query on the command line looks like:
.1.3.6.1.2.1.10.48.1.5.1.2:

Code:

.1.3.6.1.2.1.10.48.1.5.1.2.15.1.2.1 = INTEGER: 0
.1.3.6.1.2.1.10.48.1.5.1.2.15.2.1.1 = INTEGER: 19

and
.1.3.6.1.2.1.10.48.1.5.1.1

Code:

.1.3.6.1.2.1.10.48.1.5.1.1.15.1.2.1 = INTEGER: 0
.1.3.6.1.2.1.10.48.1.5.1.1.15.2.1.1 = INTEGER: 1

I use in the data template as max and as min value always "0". As data source type I use "COUNTER".

When going under "Create graph for this host I see:

Attachment:

Console - Create New Graphs - Google Chrome_2012-02-21_19-49-42.png [ 4.21 KiB | Viewed 577 times ]

Anyone an idea?

gandalf · **Posted:** Tue Feb 21, 2012 5:03 pm

hmorandell wrote:

I use in the data template as max and as min value always "0". As data source type I use "COUNTER".

Why using COUNTER, when SNMP tells you it's an INTEGER? Use a GAUGE instead!
R.

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

changed the data template but still not working.
I'm sure it must be a problem with the XML file. I try to fix it. It's definitely no problem of the data and graph template, that's for sure.

noname · **Posted:** Wed Feb 22, 2012 6:11 am

hmorandell wrote:

changed the data template but still not working.
I'm sure it must be a problem with the XML file. I try to fix it. It's definitely no problem of the data and graph template, that's for sure.

Maybe walking to ".1.3.6.1.2.1.10.48.1.5.1.2" is not appropriate as index.
Try to add this line:

Code:

<oid_index_parse>OID/REGEXP:.*\.([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)$</oid_index_parse>

Simulated verbose query:

Quote:

Executing SNMP walk for list of indexes @ '.1.3.6.1.2.1.10.48.1.5.1.2'
Index found at OID: '.1.3.6.1.2.1.10.48.1.5.1.2.15.1.2.1' value: '0'
Index found at OID: '.1.3.6.1.2.1.10.48.1.5.1.2.15.2.1.1' value: '19'
index_parse at OID: '.1.3.6.1.2.1.10.48.1.5.1.2.15.1.2.1' results: '15.1.2.1'
index_parse at OID: '.1.3.6.1.2.1.10.48.1.5.1.2.15.2.1.1' results: '15.2.1.1'
Located input field 'SNRDisp' [walk]
Executing SNMP walk for data @ '.1.3.6.1.2.1.10.48.1.5.1.2'
Found item [SNRDisp='0'] index: 15.1.2.1 [from value]
Found item [SNRDisp='19'] index: 15.2.1.1 [from value]
Located input field 'ATNDisp' [walk]
Executing SNMP walk for data @ '.1.3.6.1.2.1.10.48.1.5.1.1'
Found item [ATNDisp='0'] index: 15.1.2.1 [from value]
Found item [ATNDisp='1'] index: 15.2.1.1 [from value]

hmorandell · **Joined:** Mon May 03, 2010 11:48 am **Posts:** 54

THX noname,

I did something similar to your solution and got it to work!!!

Here is how my XML file looks now:

Code:

<interface>
        <name>SHDSL Line Statistics</name>
        <description>Query the SHDSL Attenuation Margin</description>
        <oid_index>.1.3.6.1.2.1.10.48.1.5.1.2</oid_index>
        <oid_index_parse>OID/REGEXP:^.{24}[0-9]{1,2}\.(.*)</oid_index_parse>
        <index_order>Index</index_order>

   <fields>
                <Index>
                        <name>Index</name>
                        <source>index</source>
                        <direction>input</direction>
                </Index>
        <SNRDisp>
                <name>SNR Disp</name>
                <method>walk</method>
                <source>value</source>
                <direction>input</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.2</oid>
        </SNRDisp>
        <ATNDisp>
                <name>ATN Disp</name>
                <method>walk</method>
                <source>value</source>
                <direction>input</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.1</oid>
        </ATNDisp>
        <SNR>
                <name>SNR Margin</name>
                <method>walk</method>
                <source>value</source>
                <direction>output</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.2</oid>
        </SNR>
        <ATN>
                <name>Attenuation</name>
                <method>walk</method>
                <source>value</source>
                <direction>output</direction>
                <oid>.1.3.6.1.2.1.10.48.1.5.1.1</oid>
        </ATN>
   </fields>
</interface>

and this is a example verbose query (this is a CISCO with 3 SHDSL Interfaces!):

Quote:

Running data query [39].
+ Found type = '3' [SNMP Query].
+ Found data query XML file at '/srv/www/htdocs/cacti/resource/snmp_queries/sdslStats.xml'
+ XML file parsed ok.
+ <oid_num_indexes> missing in XML file, 'Index Count Changed' emulated by counting oid_index entries
+ Executing SNMP walk for list of indexes @ '.1.3.6.1.2.1.10.48.1.5.1.2' Index Count: 3
+ Index found at OID: '1.3.6.1.2.1.10.48.1.5.1.2.12.2.2.1' value: '15'
+ Index found at OID: '1.3.6.1.2.1.10.48.1.5.1.2.13.2.2.1' value: '13'
+ Index found at OID: '1.3.6.1.2.1.10.48.1.5.1.2.14.2.2.1' value: '13'
+ index_parse at OID: '1.3.6.1.2.1.10.48.1.5.1.2.12.2.2.1' results: '12.2.2.1'
+ index_parse at OID: '1.3.6.1.2.1.10.48.1.5.1.2.13.2.2.1' results: '13.2.2.1'
+ index_parse at OID: '1.3.6.1.2.1.10.48.1.5.1.2.14.2.2.1' results: '14.2.2.1'
+ Inserting index data for field 'Index' [value='12.2.2.1']
+ Inserting index data for field 'Index' [value='13.2.2.1']
+ Inserting index data for field 'Index' [value='14.2.2.1']
+ Located input field 'SNRDisp' [walk]
+ Executing SNMP walk for data @ '.1.3.6.1.2.1.10.48.1.5.1.2'
+ Found item [SNRDisp='15'] index: 12.2.2.1 [from value]
+ Found item [SNRDisp='13'] index: 13.2.2.1 [from value]
+ Found item [SNRDisp='13'] index: 14.2.2.1 [from value]
+ Located input field 'ATNDisp' [walk]
+ Executing SNMP walk for data @ '.1.3.6.1.2.1.10.48.1.5.1.1'
+ Found item [ATNDisp='19'] index: 12.2.2.1 [from value]
+ Found item [ATNDisp='18'] index: 13.2.2.1 [from value]
+ Found item [ATNDisp='18'] index: 14.2.2.1 [from value]

and this is one of the generated graphs. I will now do some finetuning, maybe add some more results (CRC errors), then if someone is interested I will post the scripts here.

Attachment:

ssssss.jpg [ 33.04 KiB | Viewed 559 times ]

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