Using SNMP to retrieve RSSI out of 2602E AP

[willmyers]

I am working on getting the RSSI out of a few work group bridges we have.  All bridges and AP's are running 12.4(2)JA code.

The oid for signal strength is 1.3.6.1.4.1.9.9.273.1.3.1.1.3

If I send an snmpget request to the bridge using that oid it returns no such instance.  After using an snmp walk application I found that it needs some more information tagged onto the oid.

The full oid it found was 1.3.6.1.4.1.9.9.273.3.1.1.3.2.11.65.83.82.83.45.80.83.75.45.73.79.52.168.78.31.160.31

Obviously 1.3.6.1.4.1.9.9.273.1.3.1.1.3 = Signal strength

We determeined that 65.83.82.83.45.80.83.75.73.79 = The SSID

And 52.168.78.31.160.31 = The MAC of the AP it is associated to

The only thing that we were unable to determine is the two numbers directly after the signal strength portion of the oid ( the 2 and 11)

Does anyone have any idea where the 2 and 11 come from. 

[larsthobiasen]

Hi Will

What firmware are you using.

I just talked to cisco TAG because "1.3.6.1.4.1.9.9.273.1.3.1.1.3" is not working on my AP.

AIRESPACE-WIRELESS-MIB is not supported on 2602.

Lars

[willmyers]

We are using version 15.2(2)JB2

[larsthobiasen]

Hi Will

Tkank you for the information.

if i use the Paessler SNMP tester, an send the OID  1.3.6.1.4.1.9.9.273.1.3.1.1.3 to the access-point it will return:

----------------------- New Test -----------------------

Paessler SNMP Tester 5.1

21-11-2013 20:37:09 (2 ms) : Device: 10.0.200.105

21-11-2013 20:37:09 (3 ms) : SNMP V1

21-11-2013 20:37:09 (4 ms) : Custom OID 1.3.6.1.4.1.9.9.273.1.3.1.1.3

21-11-2013 20:37:09 (53 ms) : -------

21-11-2013 20:37:09 (54 ms) : Value: No Such Name (SNMP error # 2)

21-11-2013 20:37:09 (54 ms) : Done

Are you able to get the RSSI information of an AP-client? - Cisco TAG says that this not are posible on the 1600 ane 2600 series, because the AIRESPACE-WIRELESS-MIB not are included in the firmware.

I appreciate your help!

Lars

[willmyers]

I am able to get RSSI, client up time, client data rate, client packets in and out.. etc.  

So the base oid you will be using is the CISCO-DOT11-ASSOCIATIONS-MB

1.3.6.1.4.1.9.9.273.1.3.1.1.

Followed by a 3 for RSSI

Followed by the radio (2 for A/N and 1 for B/G I think)

So lets say you are using the A radio and your SSID is guest

At this point the OID you will send would look like this:

1.3.6.1.4.1.9.9.273.1.3.1.1.3.2.5.

Now you need to take the SSID and convert each character to decimal.  So convert g to dec, u to dec,....... etc.  Be careful case does matter.

So now you have:

1.3.6.1.4.1.9.9.273.1.3.1.1.3.2.5.103.117.101.115.116.

The last piece is the Mac address of the AP that you are associated to.  So take your mac address, grab the characters in groups of two, convert them to decimal, and then stick them on to the oid.

So now you would have something like this:

1.3.6.1.4.1.9.9.273.1.3.1.1.3.2.5.103.117.101.115.116.52.168.78.31.160.31

[larsthobiasen]

Can you please veryfy the following:

1.3.6.1.4.1.9.9.273.1.3.1.1. + 3 +2 (RSSI+A)

SSID test:

116.101.115.116

MAC: 8c705aff58fo

140.112.90.255.88.240

Full OID:

1.3.6.1.4.1.9.9.273.1.3.1.1.3.2.116.101.115.116.140.112.90.255.88.240

you have the number 5 after the Radio?

You have already been a great help!

[willmyers]

I ran your SSID and MAC address into my program and came up with.

1.3.6.1.4.1.9.9.273.1.3.1.1.3.2.4.116.101.115.116.140.112.90.255.88.240