How to find network negotiation settings?

Our network team replaced all our core routers and switches this past
weekend. Since then, our iSeries appears to be slower when talking on the
network. This is most apparent when printing, where spooled files stay in
PND and WTR status for longer than normal, compared to last week.

I think we need to change the negotiation settings in the router and the
iSeries for them to match. All the router ports are set to auto negotiate
but I recall the iSeries settings are manual. I do not remember where to
see or set the negotiation settings. Also, is a 5701 NIC gigabit capable?

Thanks,
Loyd