Switch – dell power connect 3524 switch SNMP port mapping

dellsnmpswitch

I am using MibViewer utility and executing SNMP Walk command using OID .1.3.6.1.2.1.17.7.1.2.2.1.2 to find which MAC addresses are connected to which ports on my switch.

What I am seeing is that for every walk request the switch seems to return inconsistent results every time. Out of the 24 live ports on the switch it only returns mappings for some of the ports each time.

Why doesn't it always return every port mapping each time?

I have a program which has to sit there and execute SNMP get command sometimes for up to 10 minutes before it can get all 24 ports mapped.

I would like to find a more efficient, faster way to retrieve all of the port to MAC address mappings.

Best Answer

A PowerConnect 35XX? That must be a new model. Seriously, are you trying to keep the model number a secret?

In any event, the 35XX series switches are managed switches so why not just log in to the web interface and look at the Dynamic Address table?

Is it a requirement to have a programattic way of interrogating the address table?

Related Solutions

Assign computers to specific VLANs with Dell PowerConnect 3524/6224

the dynamic vlan feature is actually still based on the mac address... or can make use of a captive portal. I.e. you can dump "unauthenticated" workstations into a specific vlan that only allows access to a locked-down website asking for username/password which will grant them access to a specific vlan.

For MAC authentication, you simply supply the username & password as the mac address in the radius server.

As far as radius authentication goes... I've set it up in a lab, but have yet to deploy it. It works great as long as you take some important things into consideration... I could go into details, but that's a very long discussion.

Mac – DELL switch 6248 port and mac mapping using SNMP

You have to do a little bit of tracking through BRIDGE-MIB and IF-MIB.

(Caveat: I don't have your specific switch model to test on, but these are standard MIBs, so this should work.)

Use dot1dTpFdbAddress (.1.3.6.1.2.1.17.4.3.1.1) from BRIDGE-MIB to find the MAC addresses (example shows a single line of snmpwalk output for clarity, you'll probably get several rows returned):

>snmpwalk -v 2c -c public myswitch .1.3.6.1.2.1.17.4.3.1.1
SNMPv2-SMI::mib-2.17.4.3.1.1.0.20.124.62.198.161 = Hex-STRING: 00 14 7C 3E C6 A1

Take those numbers that follow the base OID (looking at the example, I'm talking about 0.20.124.62.198.161). Use them to find the value of dot1dTpFdbPort (.1.3.6.1.2.1.17.4.3.1.2), also from BRIDGE-MIB:

>snmpwalk -v 2c -c public myswitch .1.3.6.1.2.1.17.4.3.1.2
SNMPv2-SMI::mib-2.17.4.3.1.2.0.20.124.62.198.161 = INTEGER: 794

Take the integer values from dot1dTpFdbPort (794 in the example) and use them to find the value of dot1dBasePortIfIndex (.1.3.6.1.2.1.17.1.4.1.2), again from BRIDGE-MIB:

>snmpwalk -v 2c -c public myswitch .1.3.6.1.2.1.17.1.4.1.2
SNMPv2-SMI::mib-2.17.1.4.1.2.794 = INTEGER: 200

That value is your ifIndex (200 in the example). Use that to pull a human-friendly value out of ifName (.1.3.6.1.2.1.31.1.1.1.1), from IF-MIB:

>snmpwalk -v 2c -c public myswitch .1.3.6.1.2.1.31.1.1.1.1
IF-MIB::ifName.200 = STRING: 4/20

Best Answer

Related Solutions

Assign computers to specific VLANs with Dell PowerConnect 3524/6224

Mac – DELL switch 6248 port and mac mapping using SNMP

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