Re: Juniper support for 10/25G SFP - Do they support dual rate SFP ?
Yes, with the now shipping QFX5200-48y. The QFX5200-32C could also be broken out to 4 x 25GE or set as 40GE and broken out to 4 x 10GE. As for QFX5200-48y:
QFX5200-48Y:This 1 U 48x25GbE switch has 6x100GbE uplink ports for connecting to the spine, making it an ideal choice for 25GbE access or leaf deployments with a 100GbE spine. Additionally, it’s backward compatible, as 25GbE access ports can be configured to 10GbE, and the 100GbE uplink ports can be configured to 40GbE.
There will be another 10/25 GE native switch coming out later in 2018, the QFX5120-48y, and then a similar form factor, the EX4650-48y.
y = 25GE natively capable. The default operation is 10GE. There is a setting to convert ports to 25GE in groups of 4 ports.