I have been getting myself familiar with LMS, but can't figure out why I am having issues seeing some devices. I can't find any solution to my problem on other posts.
I have a server farm connected to my core switch, both can see each other via CDP, and the SF can ping the LMS server. However, I have 'device unreachable' on device discovery and CiscoView. SNMP community strings are the same on each device, and are configured on LMS.
What I have done in the past is to run wireshark defining just the host IP that you are trying to gather information from. Perform this at the LMS server and initiate the connection to the device. Look for the SNMP connections and see if the connection is made. I have found in the past that snmp from the LMS server was not allowed to some of the devices and I had to add the LMS server IP to the approved ACL for SNMP connections.
LMS tries to contact each device directly via SNMP. If it can talk directly to the device, the device is added into DCR as Reachable. If it cannot talk directly to the device, the device is deemed as Unreachable and it is not added into DCR to be managed by LMS.
If LMS is unable to communicate it could be due to any number of things including timeout, incorrect community string, snmp-server view, firewall or access list.
A definitive way to determine the issue would be to perform a packet capture during discovery to see the SNMP transaction between LMS and an 'unreachable' device.
I ran a packet trace and the unreachable device was never once sent an SNMP packet. Further, running the Device Troubleshooting Report on the CW Assistant shows that SNMP v2c read/write failed (my obvious problem), while other devices would pass. Everywhere else that I can think to check device settings for SNMPv2 read/write strings seem to be fine. Any thoughts? Thanks!
I have verified the community strings, and have even changed them to plain alphanumeric in case it was a character issue. All other devices currently registered have the same SNMP strings, with no problem. Also tried SNMP walk tool inside LMS, which also fail.
Packet trace on the server gives me the following:
The device that LMS (172.20.103.60) fails to reach is the server farm switch (Cat 4510R-E) at 172.20.254.51 that it is directly connected to.
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