Find Neighbour with SNMP LLDP

StackOverflow https://stackoverflow.com/questions/15898109

Question

i have several switches (Hirschmann Mach1040, RS40) connected together. So i want to elict the mac address/ip address of the connected neigbour switch on port x with the snmp. is there a lldp mib_value which tells me the neihbour mac or ip at the specific port on the swich??

Thanks a lot for the help!!!

Was it helpful?

Solution

This code is walking LLDP oid on devices from list which contains ip addres and add neighbourships to parallel arrays. ex; (Each heading is ArrayList) HostName HostInterface NeigbourName NeighbourInt sw2960 fa0/1 HP-98765 Ethernet0/4

   package NDMSMain;

import java.io.IOException;
import java.util.ArrayList;

import SNMPHandler.SNMPManager;
import SNMPHandler.SNMPWalk;
import TopologyHandler.WriteXMLFile;

public class LldpDiscovery {

    static SNMPWalk t1 = new SNMPWalk();
    public static String LLDP_OID = "1.0.8802.1.1.2.1.4.1.1";
    public static String snmpCheck = null; //MODEL
    public static String devicePid = null;  //Product Id

    public static ArrayList<String> topologyNodeId = new ArrayList<String>();
    public static ArrayList<String> lldpHostName = new ArrayList<String>();
    public static ArrayList<String> lldpHostInt = new ArrayList<String>();
    public static ArrayList<String> lldpNeigName = new ArrayList<String>();
    public static ArrayList<String> lldpNeigInt = new ArrayList<String>();
    public static ArrayList<String> lldpNeigMac = new ArrayList<String>();
    public static ArrayList<String> deviceModel = new ArrayList<String>();


    public static void main() {

        System.out.println("LLDP GELDIIIII");

        frame1 out = new frame1();
        String testWalk="";

        String satir[]=null;
        String esit[]=null;
        String hostInt = null;
        for(int i=0; i<out.ipler.size();i++)
        {
            try {

                devicePid = SNMPManager.main("udp:"+out.ipler.get(i).toString()+"/161","1.0.8802.1.1.2.1.5.4795.1.2.7.0");

            if(!devicePid.startsWith("no"))
            {
                // To determine node count and Id s

                snmpCheck= SNMPManager.main("udp:"+out.ipler.get(i).toString()+"/161","1.3.6.1.2.1.1.5.0");
                deviceModel.add(devicePid);
                topologyNodeId.add(snmpCheck);



            testWalk =  t1.main(out.ipler.get(i).toString(),LLDP_OID);


            satir= testWalk.split("\n");
            //System.out.println("satir 0"+satir[0].toString());
            //System.out.println("satir 1"+satir[1].toString());
            int ind =0;
            for(int k=0;k<satir.length;k++)
            {

                esit = null;
                esit = satir[k].split("=");
                //System.out.println("===Hostlar");
                //System.out.println("ind 0: "+esit[ind]);
                if(esit[ind].startsWith("1.0.8802.1.1.2.1.4.1.1.7.0") && !esit[ind].equals("1.0.8802.1.1.2.1.4.1.1.7.0.1.2 "))
                {


                    hostInt = esit[ind].substring(esit[ind].length()-5, esit[ind].length()-3);
                    //System.out.println("===Start-4.1.1.7.0 - genel cnt: "+ arrayCnts +" fa0-"+hostInt);
                    if(!hostInt.startsWith("."))
                    {
                        //System.out.println("===Start-4.1.1.7.0 - .li cnt: " + arrayCnts +"fa0-"+hostInt);
                        lldpHostInt.add("fa0-"+hostInt);

                    }
                    else
                    {
                        //System.out.println("===Start-4.1.1.7.0 - .siz cnt: " + arrayCnts +"fa0-"+hostInt);
                        lldpHostInt.add("fa0-"+hostInt.substring(hostInt.length()-1,hostInt.length())); 

                    }

                    //System.out.println("=== LLDPNeigh cnt:" + arrayCnts + esit[1]);
                    lldpNeigInt.add(esit[1]);


                }
                else if(esit[ind].startsWith("1.0.8802.1.1.2.1.4.1.1.9.0"))
                {
                    //System.out.println("=== NeighNAme cnt:" + arrayCnts + esit[1]);
                    if(!esit[1].equals(" "))
                    {
                        lldpNeigName.add(esit[1]);
                        lldpHostName.add(snmpCheck);
                    }



                //  lldpHostName.add(out.asd);

                }
                else if(esit[ind].startsWith("1.0.8802.1.1.2.1.4.1.1.5.0") && !esit[ind].equals("1.0.8802.1.1.2.1.4.1.1.5.0.1.2 "))
                {

                    lldpNeigMac.add(esit[1]);
                }
            }
            }

            else   // SNMP DESTEKLEMEYEN CIHAZLAR ICIN COZUM BULUNACAK
            {


                System.out.println("*********There is unknown device here!!!! ******");

            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }//
        }


        System.out.println("---HostName---");
        for(int i=0; i<lldpHostName.size();i++)
        {
            System.out.println(lldpHostName.get(i).toString());
        }
        System.out.println("---HostInt---");
        for(int i=0; i<lldpHostInt.size();i++)
        {

            System.out.println(lldpHostInt.get(i).toString());

        }
        System.out.println("---NeighInt---");
        for(int i=0; i<lldpHostInt.size();i++)
        {

            System.out.println(lldpNeigInt.get(i).toString());

        }
        System.out.println("---NeighName---");
        for(int i=0; i<lldpNeigName.size();i++)
        {
            System.out.println(lldpNeigName.get(i).toString());
        }
        System.out.println("---NeighMac---");
        for(int i=0; i<lldpHostInt.size();i++)
        {
            System.out.println(lldpNeigMac.get(i).toString());
        }
        System.out.println("---NodeId---");
        for(int i=0; i<topologyNodeId.size();i++)
        {
            System.out.println(topologyNodeId.get(i).toString());
        }

        for (int i=0;i<lldpNeigName.size();i++)
        {
            if(!topologyNodeId.contains(lldpNeigName.get(i).trim()))
            {
                topologyNodeId.add(lldpNeigName.get(i));
            }
        }


        System.out.println("===LLDPNODE ID");
        for(int i=0; i<topologyNodeId.size();i++)
        {
            System.out.println(topologyNodeId.get(i).toString());
        }   




    //  createCSV();

        //WriteXMLFile.main();



    enter code here

        /*lldpHostName.clear();
        lldpHostInt.clear();
        lldpNeigInt.clear();
        lldpNeigMac.clear();
        lldpNeigName.clear();
        topologyNodeId.clear();
        deviceModel.clear();*/


    }

}

OTHER TIPS

I think you are wanting lldpRemLocalPortNum, which is of syntax type LldpPortNumber. The definition of LldpPortNumber says:

        A port number has no mandatory relationship to an
        InterfaceIndex object (of the interfaces MIB, IETF RFC 2863).
        If the LLDP agent is a IEEE 802.1D, IEEE 802.1Q bridge, the
        LldpPortNumber will have the same value as the dot1dBasePort
        object (defined in IETF RFC 1493) associated corresponding
        bridge port.  If the system hosting LLDP agent is not an
        IEEE 802.1D or an IEEE 802.1Q bridge, the LldpPortNumber
        will have the same value as the corresponding interface's
        **InterfaceIndex** object.

InterfaceIndex is the IF-MIB::ifIndex, which should map to the correct interface on the device. Does that help?

So here's more details (I needed the big text box). Let's say you have the entry you mentioned in the comments above:

lldpRemTable.lldpRemEntry.lldpRemChassisId.1325376015.2.1 ec e5 55 32 20 88

Notice that lldpRemTable has a indexes of:

    INDEX   {
       lldpRemTimeMark,
       lldpRemLocalPortNum,
       lldpRemIndex
    }

In the above example, you're asking for lldpRemChassisId (remote's chassis id) for the remote entry (his mac for the chassis, ec e5 55 32 20 88). 1325376015 is the lldpRemTimeMark table index (a time value for when you discovered the remote), and 2 is lldpRemLocalPortNum table index (the local port number that you discovered the remote on).

lldpRemLocalPortNum is of type/Textual Convention of LldpPortNum. So you should also have an entry in lldpLocPortTable (also type of LldpPortNum) with lldpLocPortNum == 2 (and probably an IF-MIB::ifIndex == 2). So lldpLocPortTable.lldpLocPortDesc.2 will be the port description of the port that you discovered the remote on. i.e. :

lldpLocPortTable.lldpLocPortDesc.2 = "FastEthernet2 (eth2)"

That's how you do the mapping.

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