NTP Not Discovering All Connections in 7 switch network

Question

The drawing below is the result of a 7 IP address discovery, using SNMP.

I've confirmed the SNMP v2 community string on all 7 switches.

Can anyone tell me why the switch with the red cloud around it, doesn't have connections to the switches above, to the left of, and below it?

I know they are physically there and CDP neighbor shows the switches there, but they don't show up on the map.

The other interesting thing is when I look up the problem switch in Orion NPM and look at the Network side tab, I don't have a NPM Network Topology listing, showing the L2 and L3 connections, like I do for the other switches in the discovery.

Any clue why? I feel like I'm missing something <hopefully> simple.

Thanks for your help.

Kevin

kmphilbin · Accepted Answer

<banging my head on my desk> I sure thought CDP was enabled on all of my switches involved in this discovery, but the one in question did not. That was the problem. I did a CDP run, and there the connections were. I should have double-checked that first.

According to the missing connections document, CDP or LLDP, need to be enabled. There are other suggestions for things to check as well.

NTP Not Discovering All Connections in 7 switch network

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