Rule rejected UDP(17) traffic

Hello Community

This busy Firewall Activity is back...10 non stop pages filled in 37 minutes.  

Any thoughts.  Is this noise ?  UPnP enabled in router by default (no option to disable) and disabled in services.  SSDP Discovery is Running from Manual.  My Network IP is 192.168.1.100

4/2/2015 7:50:03 PM,Info,    Rule  rejected  UDP(17)  traffic with  (192.168.1.100  Port ssdp(1900) ),Detected,No Action Required,Firewall - Activities,,,,,,
same repeated activity
4/2/2015 7:13:32 PM,Info,    Rule  rejected  UDP(17)  traffic with  (192.168.1.100  Port ssdp(1900) ),Detected,No Action Required,Firewall - Activities,,,,,,
no logging
4/1/2015 8:57:00 PM,Info,Smart Firewall is enabled.,Detected,No Action Required,,,,,,,