SNMP Mapping Mac Address to Switch Port

Question

Hi there,

I work at a datacenter and I'm in the process of writing a php tool that maps all of our devices and can tell us if what is out there is what is being billed for.

It first pulls a huge list of macs and their ips from both of the cores into a temp table. Then, it loops through all of the racks* and attempts to find which port that mac belongs to. Since there is no golden command (cue lightbulb over your head), I have to:

1. Create a multi-array with the port as the key and the ifindex for the value.
2. Replace the ifindex with with a bridge ID.
3. Replace the bridge ID with the mac hash.
4. Repalce the mac hash with the actual mac

Lastly, it takes the mac, ips, and port and populates the master table.

The problem is step one. 1.3.6.1.2.1.31.1.1.1.1 works on most of the switches but a few of the foundrys do not work. 1.3.6.1.4.1.1991.1.1.3.3.1.1.38 kinda comes close to what I'm looking for but im not entirely comfortable it's what I'm looking for. I was able to find the specific device models under foundry > products > registration, but there aren't any MIBs under that folder. So my questions are:

1. Is there a foundry specific string that returns ports and macs? ifindexes would also work.
2. How do I go about using device specific MIBs (enterprises.foundry.products.registration.snFWSXFamily)?

Any direction on this would be great. -Justin

*= rack models: cisco 2900xl, foundry FI4802 + variants

Answer 1

when I needed to discover MACs and some other info from my switches, I used 'snmpwalk' and 'snmpbulkwalk' commands to examine their SNMP data contents

for example:

snmpbulkwalk -v2c 192.168.30.40 -c public 1.3.6.1.2.1.31.1.1.1.1

outputs:

IF-MIB::ifName.1 = STRING: Gi0/1
IF-MIB::ifName.2 = STRING: Gi0/2
IF-MIB::ifName.3 = STRING: Gi0/3
IF-MIB::ifName.4 = STRING: Gi0/4
IF-MIB::ifName.5 = STRING: Gi0/5
IF-MIB::ifName.6 = STRING: Gi0/6
IF-MIB::ifName.7 = STRING: Gi0/7
IF-MIB::ifName.8 = STRING: Gi0/8
IF-MIB::ifName.9 = STRING: Gi0/9
IF-MIB::ifName.10 = STRING: Gi0/10
IF-MIB::ifName.11 = STRING: Gi0/11
IF-MIB::ifName.12 = STRING: Gi0/12
IF-MIB::ifName.13 = STRING: Nu0
IF-MIB::ifName.14 = STRING: Vl1
IF-MIB::ifName.15 = STRING: Vl2
IF-MIB::ifName.16 = STRING: Vl416

and

snmpbulkwalk -v2c 192.168.30.40 -c public 1.3.6.1.2

outputs A LOT of info among which you can look for your favorite MACs or anything