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mark99i
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2x CRS326-24S+2Q+ MLAG configuration

Fri Feb 16, 2024 2:43 am

Hello, while configuring the MLAG configuration on two CRS326-24S+2Q+ switches, I encountered incomprehensible behavior that could potentially lead to a service failure during operation. I have attached a physical connection diagram (png) and updated to the latest version of the ROS7 branch.

To connect the server, I use SFP-DAC-001 cables.

The first problem is that when disconnecting the network adapter on the server, the status of the sfp plus interface remains active. At the same time, if I disable the interface from the switch side, then it will be in the disconnected status on the server (network cable is not connected)

The second problem is that the bonding used as the basis for MLAG uses the state of the physical link (Mii monitoring) to determine the state of the logical LACP channel (802.3ad), which leads to packet losses as soon as I disable the interface from the server side.

It is very strange that the physical state of the link is used to check the state of the logical LACP channel, while the physical link may be active but not configured on the other side and this will also lead to packet loss.

At the same time, when I disconnect the interface from the server side, despite the fact that the physical link on the switch remains active, as well as the bonding interface attached to it, the failure indicator may be the lack of LACP negotiation. At the same time, this field is visible in winbox (bonding interface - status - lacp partner system id) and it becomes empty as soon as the agreement is violated.

For what reason can I not select this field as the activity of the bonding interface?

I wrote to technical support on this issue (SUP-114652), but maybe there will be some thoughts here. I recently set up exactly the same configuration on arista switches (but 1g ethernet). They can clearly separate the stages: after connecting the cable and after agreeing on the LACP protocol, as well as configure different VLAN settings
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adcre
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Posts: 27
Joined: Fri Dec 10, 2021 4:18 pm

Re: 2x CRS326-24S+2Q+ MLAG configuration

Tue Feb 20, 2024 1:13 pm

Hello!
Could you post the configuration part of mlag, and interfaces (including vlans).
I think could be related to the propagation of vlans on peerport, but I can be wrong.

Best Regards!
 
roadracer96
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Joined: Tue Aug 25, 2009 12:01 am

Re: 2x CRS326-24S+2Q+ MLAG configuration

Thu Feb 22, 2024 2:56 am

Mlag is completely broken in mikrotik. Doesn't work right at all and never should have been released.
 
adcre
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Posts: 27
Joined: Fri Dec 10, 2021 4:18 pm

Re: 2x CRS326-24S+2Q+ MLAG configuration

Thu Feb 22, 2024 3:13 pm

Mlag is completely broken in mikrotik. Doesn't work right at all and never should have been released.
I am not agree with that, we have been using it with crs317 since July 2022 in production (test were made first on lab to check all our needs would work).

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