I would like to know how much ports are there in a switch and how much is used using SNMP.
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Thank you for your response. I was asking, Is there any way available to query Switch using Simple Network Management Protocol or any other protocol to know the status of physical ports available in the switch. There are application available in the market to do the same. I would like to know the way behind it? Or if I want to create an application(NMS) by myself how will I know this.
First you need to check to see if your Switch has the SNMP feature. If it has then you must get an application that can connect to it to be able to display statistics.
Try,
http://www.paessler.com/pr
As for creating a program yourself. I wouldnt know where to start. Your best bet would be to ask this question in the Experts-Exchange Programming section.
Jeff
if its a cisco switch, you can download the cisco network assistant which is free and very useful. if it isn't, then you can do an snmpwalk of the ifEntry tree. look at the ifAdminStatus and ifOperStatus and ifType attributes. You just need to really count how many entries you come across to know the total and how many ifOperStatus are up to know the number used, unless you strictly enforce administrative up/down on ports, then you can just count those (in case a link happens to be down when you run your query). as for ifType, you just use that to look for type 6, ethernet, so that you don't accidentally skew your count by including virtual ports.
its a fairly simple script if you want to go the programming route
You have to configure a SNMP-RO(Read-Only) community string (read: password) on the Switch. The default RO-string is usually "public". You then take a SNMP/MIB Browser and "browse the MIB-Tree" The switch manufacturer should be able to tell you what MIBs he has implemented and which OIDs he has implemented you can poll to get the data you want. (for Cisco Switches for instance the supported MIB are listed in their datasheets - you can vie Cisco MIBs at http://www.cisco.com/go/mi
There is a standard Interface-MIB implemented on most snmp-managable switches. So with a tool like OIDview by bytesphere [http://www.oidview.com/oi
->There is (should be) one OID that tells you if the Interface is up or down, one for speed, another for the duplex settings.
Regards
Robert
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by: jeff_01Posted on 2009-11-04 at 00:19:30ID: 25737329
Well it depends on the switch. You get 8,16,24,48 port switches etc etc..
SNMP doesnt use a port itself. SNMP is a protocol (Simple Network Management protocol) that is used to monitor and manage devices on a network.