network topology on the switch some interface not success to establish peernode

Started by hmjvaline, October 16, 2024, 07:14:57 PM

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hmjvaline

October 16, 2024, 07:14:57 PM Last Edit: October 18, 2024, 03:16:09 AM by hmjvaline
When performing network topology on the switch, the results of lldp and fdb are obtained at the same time, resulting in a conflict and failure to establish the peernode. 

In the following log record, I found that two record is


2024.10.16 23:13:55.965 *D* [topology.link      ] LinkLayerNeighbors::isDuplicate: inconsistent data: FDB(ifLocal=2 remote=76050/5) FDB(ifLocal=41 remote=76040/5)
2024.10.16 23:13:55.965 *D* [topology.link      ] LinkLayerNeighbors::isDuplicate: inconsistent data: FDB(ifLocal=2 remote=76050/5) FDB(ifLocal=42 remote=76048/5)

As a result, I was supposed to find 5 but then I only found 2.


The netxms I use is 5.0.8 and the switch is dlink dgs-1510-52
Other switches of the same type Also having the same issue. The switches are connected to computers and operating systems with the same hardware specifications.
I would like to ask what is the reason for this result, which makes me very confused. I've found that this issue may not be limited to a certain type of network switch.


2024.10.16 23:13:51.088 *D* [topology.fdb      ] GetSwitchForwardingDatabase(sw-203-dlink [47278]): 165 entries read from dot1qTpFdbTable
2024.10.16 23:13:51.177 *D* [topology.fdb      ] GetSwitchForwardingDatabase(sw-203-dlink [47278]): 0 entries read from dot1dTpFdbTable
2024.10.16 23:13:51.177 *D* [poll.topology      ] Switch forwarding database retrieved for node sw-203-dlink [47278]
2024.10.16 23:13:51.177 *D* [topology.link      ] BuildLinkLayerNeighborList(sw-203-dlink [47278]): building link level topology
2024.10.16 23:13:51.177 *D* [topology.driver    ] Collecting topology information from driver DLINK for node sw-203-dlink [47278]
2024.10.16 23:13:51.177 *D* [topology.driver    ] Driver for node sw-203-dlink [47278] cannot provide link layer topology information
2024.10.16 23:13:51.177 *D* [topology.lldp      ] Collecting LLDP topology information for node sw-203-dlink [47278]
2024.10.16 23:13:55.690 *D* [topology.lldp      ] 5 entries in LLDP-MIB connection database for node sw-203-dlink [47278]
2024.10.16 23:13:55.690 *D* [topology.lldp      ] Finished collecting LLDP topology information for node sw-203-dlink [47278]
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): FDB retrieved
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found single MAC A0:36:BC:5B:19:A7 on interface eth1/0/2
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found remote interface ethernet 2 [76051]
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found single MAC A0:36:BC:5B:18:1C on interface eth1/0/3
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found remote interface ethernet [75986]
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found single MAC A0:36:BC:5B:18:D9 on interface eth1/0/41
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found remote interface ethernet 2 [76041]
2024.10.16 23:13:55.965 *D* [topology.link      ] LinkLayerNeighbors::isDuplicate: inconsistent data: FDB(ifLocal=2 remote=76050/5) FDB(ifLocal=41 remote=76040/5)
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found single MAC A0:36:BC:5B:1A:E0 on interface eth1/0/42
2024.10.16 23:13:55.965 *D* [poll.topology      ] Node::addHostConnections(sw-203-dlink [47278]): found remote interface ethernet 2 [76049]
2024.10.16 23:13:55.965 *D* [topology.link      ] LinkLayerNeighbors::isDuplicate: inconsistent data: FDB(ifLocal=2 remote=76050/5) FDB(ifLocal=42 remote=76048/5)
2024.10.16 23:13:55.965 *D* [topology.link      ] BuildLinkLayerNeighborList(sw-203-dlink [47278]): 2 connections found

hmjvaline

#1
October 17, 2024, 11:14:21 AM
nodeid 76050 have a interface(objectId=76051) ifindex=5 mac address A0:36:BC:5B:19:A7 is physical link on the sw-203-dlink(dgs-1510-52) switch eth1/0/2
nodeid 76040 have a interface(objectId=76041) ifindex=5 mac address A0:36:BC:5B:18:D9 is physical link on the sw-203-dlink(dgs-1510-52) switch eth1/0/41
nodeid 76048 have a interface(objectId=76049) ifindex=5 mac address A0:36:BC:5B:1A:E0 is physical link on the sw-203-dlink(dgs-1510-52) switch eth1/0/42

my nodeid 76050 76040 76048 's operation The operating systems are completely cloned. Only the hardware information is slightly different, such as the network card mac address and ip.
in netxms i use topology sw-203-dlink switch forwarding database list result ,It is also consistent with the actual interface between the computer and the switch.

so i search in source code
In lln.cpp I find I saw the relevant code below


Also, I have also directly queried the lldp of the switch and I get this result

Name/OID: .1.0.8802.1.1.2.1.4.1.1.7.306145956.42.9; Value (OctetString): A0-36-BC-5B-1A-E0
Name/OID: .1.0.8802.1.1.2.1.4.1.1.7.306145970.41.17; Value (OctetString): A0-36-BC-5B-18-D9
Name/OID: .1.0.8802.1.1.2.1.4.1.1.7.306146123.2.15; Value (OctetString): A0-36-BC-5B-19-A7

The information on lldp also confirms that the node is on the correct interface.
so,Is it possible that some misjudgment or mistake occurred here?

/**
* Check if given information is duplicate
*/
bool LinkLayerNeighbors::isDuplicate(const LL_NEIGHBOR_INFO& info)
{
    for(int i = 0; i < m_connections.size(); i++)
    {
      LL_NEIGHBOR_INFO *n = m_connections.get(i);
        if (n->ifLocal == info.ifLocal)
        {
          if ((n->ifRemote != info.ifRemote) || (n->objectId != info.objectId))
          {
              nxlog_debug_tag(DEBUG_TAG_TOPO_LINK, 5, _T("LinkLayerNeighbors::isDuplicate: inconsistent data: %s(ifLocal=%d remote=%d/%d) %s(ifLocal=%d remote=%d/%d)"),
                          GetLinkLayerProtocolName(n->protocol), n->ifLocal, n->objectId, n->ifRemote,
                        GetLinkLayerProtocolName(info.protocol), info.ifLocal, info.objectId, info.ifRemote);
          }
        return true;
        }
      if (n->ifRemote == info.ifRemote)
      {
        if ((n->ifLocal != info.ifLocal) || (n->objectId != info.objectId))
        {
            nxlog_debug_tag(DEBUG_TAG_TOPO_LINK, 5, _T("LinkLayerNeighbors::isDuplicate: inconsistent data: %s(ifLocal=%d remote=%d/%d) %s(ifLocal=%d remote=%d/%d)"),
                        GetLinkLayerProtocolName(n->protocol), n->ifLocal, n->objectId, n->ifRemote,
                        GetLinkLayerProtocolName(info.protocol), info.ifLocal, info.objectId, info.ifRemote);
        }
        return true;
      }
    }
    return false;
}
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