I have a CRS210 and want to use both SFP ports. While the documentation states that SFP-1 can be used at 1.25G, SFP-2 can only be used at 10G. My question is, if I put a 10G Tranceiver in that slot, turn off auto-negotiation and select 1G, will it work? Also will a 10G Tranceiver do the same in a RB2011? Trying not to waste money needlesly.