registration table and snmp

RouterOS Wireless Networking
1

I am trying to build a system that will go through all my MTs, select the ones with wireless interfaces (which I can do by looking for ieee80211 interfaces in .1.3.6.1.2.1.2.2.1.3), then start graphing signal strength levels. On stations (is there a way to determine if it’s a station or AP/bridge?), the .1.3.6.1.4.1.14988.1.1.1.1.1.4.interfacenumber works fine, but doesn’t seem to work on AP/bridge, so I must use the reg table.

What does the last two fields in the oid refer to (211.8) here?
It seems to be different on every router.

interface wireless registration-table> print oid 
 0 strength=.1.3.6.1.4.1.14988.1.1.1.2.1.3.0.21.109.16.6.211.8 
   tx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.4.0.21.109.16.6.211.8

on another router:

interface wireless registration-table> print oid
 0 strength=.1.3.6.1.4.1.14988.1.1.1.2.1.3.0.21.109.16.62.20.2 
   tx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.4.0.21.109.16.62.20.2

On a ptp link, I can get the signal leve for instance by dropping off all the stuff that varies between registration table oids on different MTs regardless of that random number. I don’t have an ptmp setups to see how that would work.

jp@mocha:~> snmpwalk -v1 -Oqn -cpublic 10.0.13.9 \ .1.3.6.1.4.1.14988.1.1.1.2.1.3
.1.3.6.1.4.1.14988.1.1.1.2.1.3.0.21.109.16.62.20.2 -80 
jp@mocha:~> snmpwalk -v1 -Oqn -cpublic 10.0.13.9 \ .1.3.6.1.4.1.14988.1.1.1.2.1  
.1.3.6.1.4.1.14988.1.1.1.2.1.3.0.21.109.16.62.20.2 -81
.1.3.6.1.4.1.14988.1.1.1.2.1.4.0.21.109.16.62.20.2 1102056692
.1.3.6.1.4.1.14988.1.1.1.2.1.5.0.21.109.16.62.20.2 2176753064
.1.3.6.1.4.1.14988.1.1.1.2.1.6.0.21.109.16.62.20.2 85009428
.1.3.6.1.4.1.14988.1.1.1.2.1.7.0.21.109.16.62.20.2 100169111
.1.3.6.1.4.1.14988.1.1.1.2.1.8.0.21.109.16.62.20.2 24000000
.1.3.6.1.4.1.14988.1.1.1.2.1.9.0.21.109.16.62.20.2 18000000
2

The last numbers in the OID are the MAC address (in decimal) of the wireless client (except the very last number). For example:

strength=.1.3.6.1.4.1.14988.1.1.1.2.1.3**.0.21.109.16.6.211**.8

So, the MAC of that client is 00:15:6D:10:06:D3 (An SR2/SR5 perhaps?)

I don’t recall what the very last number means…a brief lookup on one of my APs show that they all end with .5 instead of your .8. ANyone know what this means?

3

Okay, I’ve figured out the last number. It’s the number of the interface that the client is registered to. For example, you have the following config:

int pr

0 ether1
1 wlan1
2 wlan2

If wlan1 where an ap-bridge with clients associated to it, the registration table OIDs would all end in .2 (note that this number counts/indexes intefaces, starting at 1 and not zero). This is all based on a network running 2.8.28 so I’m not sure it’s the same in 2.9 but I bet that it is.

Now if only I couls take advantage of this in Cacti and not have to manually add all of these OIDs.

4

Yes, I overlooked that that last digit was probably the interface number. Thanks.

The mac address in the oid looks correct. thanks for showing that. Now I can use either my nasty bash to convert decimal to hex or a variation of the nice awk command I learned on the beta board here.

$> printf "%X" 109
6D

or

$> echo 109 |awk '{printf "%X", $1}'
6D