I'm at a loss as to why, but I have a primary on 100Mb where very
recently even a single unicast session now peaks >80Mb often filling the
pipe and interfering with other roles (e.g.: authentication).

I used to be able to host four concurrent unicast/multicast sessions
from this server without issue, but no longer.

Any thoughts? No significant changes in the last couple of weeks and
I've since restarted the server. No glaring signs of an error condition
in the logs either... just a lot of traffic incurred when imaging.

Can imaging be throttled server-side other than via preboot bundles in
ZCC? Ideally, something that can be imposed across the board via conf file.

Servers are SLES 11 running ZCM 11.2.3.