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

Product ID: 313962432

Details

Brand
Mikrotik
Colour
White
Compatible devices
Desktop
Included components
Power Adapter
Number of ports
9

⚡8 PoE-enabled ports for seamless power & data

🔗1G Gigabit Ethernet for ultra-fast connectivity

🛡️Robust metal case for durable, professional-grade build

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Description

⚡ Power your network like a pro — speed, control, and style in one sleek switch!

COMPACT YET MIGHTY - Small footprint (14.1 x 11.5 x 2.8 cm) packs powerful networking into a space-saving design.
SLEEK DURABLE DESIGN - Premium white metal casing ensures longevity and a modern aesthetic that fits any professional workspace.
MANAGED SWITCH CONTROL - Full network management capabilities give you granular control and monitoring for optimized performance.
BLAZING FAST GIGABIT SPEEDS - Experience lightning-fast 1 Gbps throughput to keep your network running at peak performance.
POWER UP CONNECT EFFORTLESSLY - 8 PoE ports deliver power and data over a single cable, reducing clutter and boosting efficiency.

The Mikrotik CRS309-1G-8S+IN is a managed Gigabit Ethernet switch featuring 8 PoE-enabled ports and a robust metal case. Designed for professional environments, it offers 1 Gbps data transfer rates, comprehensive network management, and a compact, durable white chassis. Ideal for millennial managers seeking reliable, high-performance networking with a clean, modern look.

Specifications

ASIN	B07NFXN4SS
Best Sellers Rank	#105,351 in Computers ( See Top 100 in Computers ) #691 in Network Switches
Brand	Mikrotik
Built-In Media	Power Adapter
Case Material Type	Metal
Color	White
Compatible Devices	Desktop
Customer Reviews	4.6 4.6 out of 5 stars (362)
Data Transfer Rate	1000 Megabits Per Second
Interface	RJ45
Item Dimensions L x W x H	14.1L x 11.5W x 2.8H centimeters
Item Weight	499 g
Manufacturer	MIKROTIK
Mfr Part Number	CRS309-1G-8S+IN
Model Number	CRS309-1G-8S+IN
Number of Layers	1
Number of Ports	9
Switch Type	Managed
Unit Count	1.0 Count
Upper Temperature Rating	40 Degrees Celsius
Voltage	12 Volts

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