topic Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link. in ExtremeSwitching (VSP/Fabric Engine)

Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Tue, 14 Jul 2026 20:42:52 GMT

Hello!

I have a scenario that involves two UISP antennas that will be linking together a 5420 to a 5320.

I'm able to establish adjacencies with no issues, but unfortunately the unifi p2p's do not include a separate physical management interface.

Is there a way to tag a management vlan over an ISIS/SPBM interface?

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

Raul_Carbonari — Wed, 15 Jul 2026 00:55:54 GMT

Hi,

I imagine that using Fabric Extend you could achieve what you are looking for

https://extreme-networks.my.site.com/ExtrArticleDetail?an=000078226

Greetings

Raúl Carbonari

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Wed, 15 Jul 2026 14:14:58 GMT

I've setup a logical interface on the two switches. However, when attempting to tag the management vlan for the UISP antennas, I get this.

There is a successful adjacency with the logical interfaces going over the UISP antennas. The Logical interfaces currently are using vlan 10 and 20 (following the illustration you posted).

did I set something up wrong?

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

Phil_ — Mon, 20 Jul 2026 14:46:09 GMT

Could you please clarify the following for us?
Would you like to establish a Fabric Connect connection between a 5420 and a 5320 via UISP antennas? Would you also like to use the uplink from the switches to these antennas as an uplink for the management interface of the UISP antennas?

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Wed, 29 Jul 2026 13:31:23 GMT

Would you like to establish a Fabric Connect connection between a 5420 and a 5320 via UISP antennas? :

The answer to this question is yes. I am successfully able to form adjacencies over the UISP antennas, but I don't have the ability to tag a management vlan to the UISP antennas and manage them.

Would you also like to use the uplink from the switches to these antennas as an uplink for the management interface of the UISP antennas?

To answer this, yes. I would like the ability to manage these antennas and transit fabric connect over a single interface.

In a traditional trunking scenario, this isn't an issue.

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

renewalls09 — Fri, 31 Jul 2026 03:52:07 GMT

Interesting scenario. Using Fabric Extend sounds like a practical approach for carrying management traffic while keeping the SPBM fabric design clean. Thanks for pointing in that direction. www yearbookavenue com

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

Phil_ — Thu, 30 Jul 2026 12:19:17 GMT

The solution would be to tag classic VLANs on that port: one VLAN for management of the antennas themselves and one VLAN for an IP transfer network for a L3 Fabric Extend connection. In theory, this should work. However, I haven´t tested it and it would be interesting to see if it works.

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

Niko_P — Tue, 18 Aug 2026 12:43:10 GMT

Hi,

you can enable:
"boot config flags nni-mstp"

This allows you to add VLANs (other than backbone-vlans) to an NNI link (isis interface).

BUT the added VLANs must not have an I-SID.

https://documentation.extremenetworks.com/VOSS/SW/88/VOSSUserGuide/GUID-57F49ED5-31BA-411B-AD8A-CFCBE5666A57.shtml
https://extreme-networks.my.site.com/ExtrArticleDetail?an=000112021

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Wed, 19 Aug 2026 13:11:40 GMT

I saw that one in the documentation too. I'm sure this would solve the issue but I'm thinking i would have to do this on every single upstream switch to accomplish this.

Thank you.

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Wed, 19 Aug 2026 13:16:05 GMT

At the moment, i did successfully get a L3 Fabric Extend connection - but only working over a direct wired connection. at this point I think the unifi antennas are the problem. I think I'll have to do a packet capture and compare the two traffic flows and see if anything is getting filtered over the p2p link.

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

ItsJaredKushner — Thu, 20 Aug 2026 14:55:13 GMT

nevermind.

Overlooked the MTU settings on the p2p antennas.

The L3 fabric extend configuration works as intended now.

And I have working management access to the antennas. Thank you Phil!

Re: Suggestions for Tagging a management vlan over an ISIS/SPBM link.

Phil_ — Fri, 21 Aug 2026 08:37:16 GMT

Happy to help.