No Link in Topology with Cisco Switch

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No Link in Topology with Cisco Switch

sohan
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I'm new to OpenNMS. I did a little test about SNMP with Buffalo Wireless Router and with Cisco Catalyst 3550 Switch:
1. I turned on SNMP on both devices
2. I made a physical connection with a cable from the lan-port of Wireless router to the fa 0/1 Switch.
3. I added 2 of them to the "node list" in OpenNMS, then I observed the Topology and I found no connection (I mean the link) between 2 nodes.
4. SNMP from both devices are up and I just set them as default setting, even the OpenNMS (I did not change anything from the beginning installation).

I use:
_ Ubuntu 16.04 LTS
_ nano /etc/opennms/enlinkd-configuration.xml:
 <enlinkd-configuration threads="5"
                     initial_sleep_time="60000"
                     rescan_interval="86400000"
                     use-cdp-discovery="true"
                     use-bridge-discovery="true"
                     use-lldp-discovery="true"
                     use-ospf-discovery="true"
                     use-isis-discovery="true"
                     />

I just want a link between 2 devices appear in the Topology map by SNMP.