VRRP/MCLAG support

[Shailesh Tyagi]

Hi there —

I am struggling to find a proper documentaion on MCLAG support. I would like to setup a pair of Mellanox SN2700 in Active/standby ToR mode connected to a Multi-homed BGP connection (similar to this). Is this even possible in the current version? "config mclag" command does not work on my current image. 

Thanks in advance,

Shailesh Tyagi

[Danny Abukalam]

My understanding is that SONiC does not yet support MC-LAG. There was an attempt to merge a patchiest last year but this since appears to be reverted. I suspect the docs you have linked there are either from an image built from that patchset, or a vendor fork of SONiC.

I would also like to use an upstream image of SONiC with MC-LAG, but most SONiC users I talk to seem to be using Layer 3 failover as redundancy as opposed to bonding across switches, which is suboptimal for smaller clusters that don’t span racks in my opinion, not to mention less performant.

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[Shailesh Tyagi]

Thanks for clarifying, Danny. I am actually surprised that such a large community can use Sonic without such a basic feature set.

[Danny Abukalam]

I agree that MC-LAG is pretty critical if you’re doing things at Layer 2, but I suspect that most of SONiC’s users are past the scale where Layer 2 is even remotely manageable.

And at that scale they probably care a lot less about single-link failure, and can mitigate for that in other ways.

But I agree Shailesh, it’s a pretty important and missing feature. MRs welcome I guess :)

There’s still some stuff in master like high-level design documentation etc - https://github.com/Azure/SONiC/tree/master/doc/mclag

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[Shailesh Tyagi]

Apparently SONiC.202106 roadmap shows support MC-LAG (L2) support. Is this going to happen in the near future or it's reverted as you mentioned.  

[Adam Yeung]

Hi Shailesh

Support for L2 MCLAG was submitted by BRCM and merged into 202106 via the following code PRs

https://github.com/Azure/sonic-swss/pull/1349 https://github.com/Azure/sonic-buildimage/pull/4819 https://github.com/Azure/sonic-swss/pull/1331 https://github.com/Azure/sonic-utilities/pull/1138 https://github.com/Azure/sonic-swss-common/pull/405 https://github.com/Azure/sonic-mgmt-framework/pull/59

The design and implementation is based on the MCLAG enhancement HLD below

https://github.com/Azure/SONiC/pull/596

Thanks

Adam

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[Shailesh Tyagi]

Thanks for the info, Adam! Do you know a tentative release date for 202106?

[Adam Yeung]

Hi Shailesh

The 202106 branch is already cut, it’s available for testing and additional fixes. Unlike a SW FCS or GA program, there isn’t a release date per se. I’d recommend you to check with the community modulators on the logistics.

Thanks

Adam 

On Sep 18, 2021, at 3:21 PM, Shailesh Tyagi <s...@samespace.com> wrote:

Thanks for the info, Adam! Do you know a tentative release date for 202106?

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[Shailesh Tyagi]

Will do, thanks! 

[Nathan Stratton]

I am running 202106 and don't see iccpd running anything needed to be done to enable it?

[Shailesh Tyagi]

systemctl unmask iccpd

systemctl start iccpd

enable iccpd service in config_db.json for autostart after reboot.