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

Product ID: 313962432

Details

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

⚡8x SFP+ 10Gbps ports

🔇Whisper-quiet metal chassis

🔧Fully managed Layer 2 switch

R11390

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Description

⚡ Elevate your network game with silent speed and pro control!

COMPACT DURABLE - Slim, white metal design fits seamlessly into modern workspaces while built to last.
SILENT POWERHOUSE - Fanless metal case ensures whisper-quiet operation—perfect for sleek office setups.
PO E READY FLEXIBILITY - Supports Power over Ethernet to simplify device deployment and reduce cable clutter.
BLAZING 10 GBPS BACKBONE - 8 SFP+ ports deliver ultra-fast, low-latency connections for your high-demand network.
PRO LEVEL NETWORK CONTROL - Advanced Layer 2 management lets you customize VLANs, QoS, and security with ease.

The Mikrotik CRS309-1G-8S+IN is a compact, fanless managed gigabit switch featuring 8 high-speed SFP+ 10Gbps ports and 1 Gigabit RJ45 port. Housed in a durable white metal case, it offers advanced Layer 2 management and Power over Ethernet support, making it ideal for professionals seeking reliable, silent, and flexible network infrastructure.

Specifications

ASIN	B07NFXN4SS
Best Sellers Rank	#122,740 in Computers ( See Top 100 in Computers ) #797 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 (374)
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 Items	1
Number of Layers	1
Number of Ports	9
Platform	No Operating System
Switch Type	Managed
Unit Count	1.0 Count
Upper Temperature Rating	40 Degrees Celsius
Voltage	12 Volts

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R11390

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.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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