How many MLAG tier topologies are supported?

Mj-networker, 

You wouldn't be able to extend it beyond, as it is 2 tier only, as seen on page 8 here.

As far as your other question, it appears you could uplink MLAG to VLT, as seen on page 50 here.

Let me know if this helps.

Hello,

thank you for clearing that up!

Just to be sure about the second answer: so I can have as many MLAGs as I want connected to the VLT?

Have a nice day

Hello, hope this helps: https://dell.to/436QnED

Thank you. I read it many times and it's just not clear enough.

Regards

Hello,

please let us know what in particular is not clear about the documentation?

Thanks

I only need to know now, can I have more than 1 MLAG domain connected to the VLT?

Hello,

in the documentation I don't see any reference to the limitation of the number of MLAG domain. I didn't found any other information about it.

Some additional info:

In a full mesh of MLAG-only peer switches (as shown in the two-tier example in Figure 8), each peer pair 
 must be in its own MLAG domain. However, with a full mesh of one MLAG peer pair and one VLT peer 
 pair, each pair is already in its own domain within its protocol. For this reason, both peer pairs may use 
 the same domain number if desired

 mj-networker,

To be 100% clear. MLAG is not the same as VLT. 
VLT supports orphan ports. 
MLAG works very well as long as every interface is a port-channel - matching on both switches.
I would never suggest anyone utilize MLAG. 
If you are in need of the benefits of a switch-redundant setup then VLT  is the answer. If you want port density then stacking would be the next closest item I'd suggest.

I hope that helps.

Thank you very much for very informative answer!

What you are saying means, that normal ports (non port-channel ports) won't work on MLAG setup switches? Or they just won't work in certain scenarios?

This does not mean that using MLAG on normal single ports does not work (peer link), but that it makes more sense to use it by creating a port channel.

Sorry, it was a misunderstanding. You said that VLT supports orphan ports, so I thought that MLAG doesn't support them. Orphan port you mean like port connected to the end station, like a computer, right? MLAG doesn't support that kind of ports?

Ty

mj-networker
yes That is exactly what I'm saying. 

MLAG fits firmly into the "distribution" layer of a three-tier topology.  Very niche area of operation. 

Oh, I am so sorry, I found the guide for this only now - Page 58 . The devices, connected to "orphan" ports, are called single-homed partners and can be connected, if you configure extra VLAN on MLAG peer-link and disable STP on it. But in this guide, there is no configuration example. Does this mean, if I just disable STP (MSTP or RSTP-PV), the system will automatically know, that that extra VLAN is ment for single-homed devices?

Disabling STP is to prevent one of the links between the two peers from being blocked. It is not that it is automatically recognized but it is a best practice to do when MLAG is configured in this situation

Hello Bronze,

Regarding your first question, it is possible to have a 3-tier topology with 6 switches connected together on N-series switches. However, it is important to ensure that the design is properly planned to avoid any potential issues with network performance or redundancy.

As for your second question, it is possible to have multiple MLAG domains connected to a VLT domain. However, it is important to consider the design and configuration of the topology to ensure that there are no issues with network performance, loop prevention, or redundancy. It is recommended to consult the Dell documentation or reach out to their technical support for guidance on configuring a VLT-MLAG topology with multiple MLAG domains.

I hope this helps!

[Best Regards]

Olivia Devid