I've noticed this on all my ERS (4800, 4900, 5900), and on VSP switches (8400, 7400. 4450, 1400). I only get informational (not serious or critical) log messages on the syslog server and on XMC. Here is the code for ERS switches.
logging remote address <XMC IP Address>
logging remote secondary-address <syslog server IP address>
logging remote enable
logging remote facility local4
logging remote level informational
On the VSP's
syslog host 1
syslog host 1 address <syslog server IP address>
syslog host 1 facility local4
syslog host 1 severity info
syslog host 1 enable
syslog host 2
syslog host 2 address <XMC IP address>
syslog host 2 facility local4
syslog host 2 severity info
syslog host 2 enable
Other non-Extreme devices show warning/notices/errors/etc. log messages on the syslog server.
Ideas????
Thanks.
