topic Mixing VDX long-distance isl and lossy isl to same RBRIDGE in Data Center (VDX)

Mixing VDX long-distance isl and lossy isl to same RBRIDGE

wgs — Fri, 20 Sep 2019 02:03:48 GMT

In general can long-distance lossless ISL links and lossy ISL links to link same
In my specific case: Would it be a good practice to add long-distance lossless 10G ISL links to a VCS logical chassis that has two 40G-LR isl links?

Re: Mixing VDX long-distance isl and lossy isl to same RBRIDGE

Michael_Morey — Fri, 20 Sep 2019 02:20:57 GMT

WGS,

For Best practices, I would recommend you review Extreme Validated Designs page. Also regarding ISLs I would recommend reviewing the guidelines and restrictions for long distance ISLs.

Thanks,

Michael Morey
Principal Technical Support Engineer – Switching, Routing & Analytics

Re: Mixing VDX long-distance isl and lossy isl to same RBRIDGE

wgs — Fri, 20 Sep 2019 02:57:00 GMT

Hi Michael,

I have review those documents, but confused slight by conflicting information in the release notes for NOS 7.3.

I am looking to create VCS logical chassis between data centers that are about 2.5km distant. I could use 10G-LR ISL with long distance. The release notes imply that lossy 40G ISL are a valid choice:

• The 40G and 100G interfaces do not support “long-distance isl” command, however can extend distances for non-lossless traffic up to 40Km using standard ISLs.

This is for client to server traffic and L3 routing.

Re: Mixing VDX long-distance isl and lossy isl to same RBRIDGE

wgs — Fri, 20 Sep 2019 04:00:42 GMT

I think perhaps I am overthinking this. We are not on WAN/METRO setup. This is all the same L2, just direct 2.5Km fiber between two rbridges.

Re: Mixing VDX long-distance isl and lossy isl to same RBRIDGE

Michael_Morey — Fri, 20 Sep 2019 04:02:32 GMT

WGS,

As the release notes state, the 40G and 100G interfaces do not support the Lossless "long-distance isl" command. The optics do however support distances up to 40Km and can be used as a standard "lossy" ISL.

Lossless support on 40G and 100G interfaces is limited to 1Km

Thanks,

Michael Morey
Principal Technical Support Engineer – Switching, Routing & Analytics