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

Mikrotik 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

⚡8x 10G SFP+ fiber ports

🔌1x Gigabit RJ45 PoE port

🛡️Advanced RouterOS & SwitchOS options

R8683

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Description

🚀 Elevate your network game with Mikrotik’s powerhouse switch!

SEAMLESS PO E POWER - Gigabit RJ45 port supports Power over Ethernet to simplify device setup and reduce cable clutter.
SILENT METAL BUILD - Robust white metal case ensures durability while running whisper-quiet—perfect for professional environments.
DUAL OS FLEXIBILITY - Switch effortlessly between RouterOS and SwitchOS for tailored network management and security.
BLAZING 10 G FIBER SPEED - 8 SFP+ ports deliver ultra-fast, low-latency connectivity for your high-demand network.
FUTURE PROOF YOUR NETWORK - Supports mixed media connections with easy integration of fiber and copper for scalable growth.

The Mikrotik CRS309-1G-8S+IN is a managed Gigabit Ethernet switch featuring 8 high-speed 10G SFP+ fiber ports and 1 Gigabit RJ45 PoE port, housed in a durable white metal case. It offers flexible network management with dual RouterOS and SwitchOS firmware options, delivering silent operation and robust performance ideal for professional and home tech enthusiasts seeking scalable, secure, and high-speed connectivity.

Specifications

ASIN	B07NFXN4SS
Best Sellers Rank	#111,344 in Computers ( See Top 100 in Computers ) #725 in Network Switches
Brand	Mikrotik
Built-In Media	Power Adapter
Case Material Type	Metal
Color	White
Colour	White
Compatible Devices	Desktop
Compatible devices	Desktop
Customer Reviews	4.6 out of 5 stars 366 Reviews
Data Transfer Rate	1000 Megabits Per Second
Included components	Power Adapter
Interface	RJ45
Item Dimensions L x W x H	14.1L x 11.5W x 2.8H centimeters
Item Weight	1.1 Pounds
Manufacturer	MIKROTIK
Mfr Part Number	CRS309-1G-8S+IN
Model Number	CRS309-1G-8S+IN
Number of Layers	1
Number of Ports	9
Number of ports	9
Product dimensions	14.1L x 11.5W x 2.8H centimeters
Switch Type	Managed
Unit Count	1.0 Count
Upper Temperature Rating	40 Degrees Celsius
Voltage	12 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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R8683

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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TrustScore 4.5 | 7,300+ reviews

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