Will the 10g sfp+ ports support 1g/gige sfp's (i.e. are the ports 1g and/or 10g capable)?

If you try to use a 1Gbit SFP transceiver that isn’t from MikroTik you will likely at first have problems and it might not work. If this happens you have to go into RouterOS and turn off auto negotiate for that port. You want to manually select the speed as well. Then I’d recommend that you use masking tape or a label maker to mark the physical router so that you or a future user knows that one of the ports has auto negotiate turned off. You’ll actually need to do this with the MikroTik S+RJ10 as well as it has problems sticking too the highest speed your cable can handle (it’s a multi speed 1G/2.5G/5G/10G transceiver) I don’t know if SwitchOS has the same problems.

Do these switches have the ability for mlag? i.e. i want to have two of these as core switches for redundancy.

I don't believe so. You would need to check with MikroTik to see if that feature is available in the Router OS.

Will cisco sfp-10g-sr and sfp-10g-lrm sfp's work in this?

Cisco compatibles have worked well for me. This is not nearly as finicky as a Cisco switch.

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⚡ Elevate your network game with Mikrotik’s powerhouse switch — speed, power, and style in one sleek package!

GIGABIT RJ 45 PORT - Versatile 1G RJ45 port ensures compatibility with legacy devices while maintaining high-speed performance.
BLAZING 10 G SFP SPEED - Experience lightning-fast data transfer with 8 high-performance 10G SFP+ ports, perfect for bandwidth-hungry setups.
COMPACT DURABLE DESIGN - Sleek white metal chassis combines modern aesthetics with rugged durability, fitting perfectly in any professional workspace.
SEAMLESS PO E INTEGRATION - Power your network devices effortlessly with built-in Power over Ethernet support, reducing cable clutter and boosting efficiency.
ENERGY EFFICIENT OPERATION - Consumes just 19 watts, delivering powerful networking without the energy guilt—smart tech for the eco-conscious pro.

The Mikrotik CRS309-1G-8S+IN is a managed Gigabit Ethernet switch featuring 8 ultra-fast 10G SFP+ ports and 1 Gigabit RJ45 port, with built-in Power over Ethernet support. Housed in a durable white metal case, it offers efficient 19W power consumption and compact dimensions, making it ideal for professional environments demanding high-speed, reliable, and streamlined network management.

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Product dimensions	14.1L x 11.5W x 2.8H centimeters
Item weight	1.1 Pounds
Voltage	12 Volts
Case material type	Metal
Upper temperature rating	4E+1 Degrees Celsius
Interface type	RJ45
Data transfer rate	1000 Megabits Per Second
Manufacturer	MIKROTIK
Item model number	CRS309-1G-8S+IN
Color	White
Wattage	19 watts
Are Batteries Included	No
Item Weight	499 g

Mikrotik CRS309-1G-8S+IN Managed Gigabit Ethernet Switch with PoE, RJ45, White, Metal Case

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