topic RE: LACP Cisco iOS/VOSS interconnection best practices in ExtremeSwitching (VSP/Fabric Engine)

LACP Cisco iOS/VOSS interconnection best practices

Jave — Fri, 12 Nov 2021 16:46:00 GMT

Hi,

Looking for creating an LACP interconnection between a SMLT VOSS Cluster and a VSS Cisco Catalyst Cluster, I wish to know best practices in terms of spanning tree and SLPP. What is the best to setup in a such case ?

Rodjeur

RE: LACP Cisco iOS/VOSS interconnection best practices

SamPirok — Mon, 29 Nov 2021 17:24:00 GMT

Hi Rodjeur, thanks for reaching out. We don't have specific best practice for this per se, as using SMLT results in STP being disabled on the SMLT side. SLPP is our recommended loop prevention and protection methodology for SMLT environments, and our best practices there involve using different rx-thresholds on the SMLT links to avoid taking both down if the loop is over the SMLT itself (eg 50 one side, 500 on the second link). The specific values used for rx-threshold should be tuned based on deployment specifics, such as the number of VLANs transmitting SLPP packets on the links. For the CISCO side of this, not having STP on the SMLT links needs to be factored into the overall loop design for that portion of the network. Hope that helps!

RE: LACP Cisco iOS/VOSS interconnection best practices

TQU — Tue, 30 Nov 2021 10:14:00 GMT

Hi Rodjeur,

From my feedback, to configure interconnexion between VOSS and other vendor device, i always use LACP (MLT or SMLT).
If it's not required, i always disable spanning-tree on MLT/SMLT. And especially with other vendors, to avoid STP compatibility issue.
SLPP is a good way to check SMLT static link agregation, i use it too.
With LACP, some says that as LACP check the agregation and it's not needed. That's true, but SLPP add another protection.

Regards,
Théo

RE: LACP Cisco iOS/VOSS interconnection best practices

Jave — Tue, 30 Nov 2021 11:35:00 GMT

Hi guys,

Thanks for your advice. I've already disabled STP on VOSS side and enabled SLPP with assymetric values for rx-threshold. If I will understood, I should to disable STP on Cisco side too ?

Rodjeur

RE: LACP Cisco iOS/VOSS interconnection best practices

TQU — Tue, 30 Nov 2021 12:03:00 GMT

Hi Rodjeur,

Yes, STP should be disabled on both side.
If STP is enabled, it can extend time during failover.

Regards,
Théo

RE: LACP Cisco iOS/VOSS interconnection best practices

Jave — Tue, 30 Nov 2021 12:07:00 GMT

Ok, I will do that.

Regards,

Rodjeur

RE: LACP Cisco iOS/VOSS interconnection best practices

EXTR_Paul — Thu, 23 Dec 2021 21:16:00 GMT

Here you go

https://extremeportal.force.com/ExtrArticleDetail?an=000083501&q=voss%20smlt%20lacp