-Each node is responsible for its EMS logging and as such will send via the node mgmt interface. Its possible we may be using the cluster mgmt LIF due to a connection problem with the node mgmt LIF. Or possibly routing is not correct.
-Suggest to open a support case so that we can investigate further.
-When opening a case provide the following:
--Cluster SNs
--::>event destination show -instance
Also , please review the following articles:
https://kb.netapp.com/app/answers/answer_view/a_id/1001020/loc/en_US#__highlight
https://kb.netapp.com/app/answers/answer_view/a_id/1029819/~/how-to-forward-syslog-messages-to-a-remote-syslog-loghost-in-clustered-data
Please also check that we can ping and traceroute from the syslog server to the cluster_mgmt LIF and the node_mgmt LIF