To setup syslog on the XOS below a example - in my case I've used VR-mgmt (mgmt port) as the source, if you use VR-default you must change that commands.
To enable it use the command #enable syslog
![3da1f76de8e04e4c88a7189298c15b17_RackMultipart20170215-117931-10gp23e-XOS_syslog2_inline.png 3da1f76de8e04e4c88a7189298c15b17_RackMultipart20170215-117931-10gp23e-XOS_syslog2_inline.png](/t5/image/serverpage/image-id/5021iFC7A5BF5A6EB0A4B/image-size/large?v=v2&px=999)
That generates the following syslog message in EMC which you could use to trigger the alarm...
"02/15/2017 22:15:21 AAA[2241]: Login passed for user admin through telnet (172.25.25.202)"