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Unknown means that solarwinds was not able to use the given SNMP creds to access the switches. There may be ACL's or who knows what else jamming you up but you need to get that sorted out. Once you do then just run a discovery against those ip addresses and solarwinds will update them to use SNMP for status instead of just pinging them and it will fix all the unknown bits.
I went into edit the polling method and changed it from icmp only to snmp. The info coming back is much much better. Thanks
if you test the credentials and they work, then you need to enable those snmp strings on the switches or have the network team do it for you.
this should help.
or you can always...