Fabric attach: SMLT Vlan, SMLT-LACP loop protection

[tfsnetman]

Hello,

I am trying to get my head around how to connect a fabric attach stack switch to a VSP cluster.

I was using this as a reference:

http://documentation.extremenetworks.com/VOSS/SW/82x/ConfigLinkAggVOSS_8.2_CG.pdf

Page 73 could be our scenario with:

2 x VSPs in a cluster with SMLT
1 x X460-G2 stack - fabric attach client, link aggregation with LACP

Questions:

SMLT VLAN

• Why would I need VLAN 33 for the SMLT, if the SMLT client is a switch?
• If a vlan is needed on the VSPs do I have to configure it on the x460 client switch and add the vlan to the uplinks as tagged?

Loop protection:

• SLPP doesn’t seem to work with LACP
• the X460 disables spanning tree on port groups
• Should I use LACP on the X460-G2 stack?
• should I keep spanning-tree enabled on the SMLT/ MLT ports on the VSPs?
• What would you recommended as loop protection?

Thanks, Klaus

[tfsnetman]

Hi guys,

I have been studying and applying the concepts mentioned in the EVD which doesn’t seem to mention the concept of a VLAN the way the VOSS 8.2 document does - hence my question.

Thank you,

Klaus

[Jay2009]

They could be using VLAN 33 just to run SLPP on.

I would do and SMLT on the VSP and use a sharing group on EXOS

enable sharing port grouping port_list

Disable spanning-tree and use SLPP on the VSPs.

Take a look at the Extreme Validated Design for Automated Campus. It is well written and a must read if you are using SPBM and EXOS edge.

https://www.extremenetworks.com/resources/extreme-validated-design/extreme-automated-campus/

[StephanH]

Hello Klaus,

in my opinion the mentioned vlan 33 is a arbitrary vlan here in the example.

Even if you connect servers, there is no need to have a special VLAN if the edge switch is an XOS.

If the edge switch is VOSS or BOSS, the configuration is different. But to my knowledge there is no special VLAN 33, so I do not know any scenario with VLAN 33.

[tfsnetman]

Hi Stephan,

Thank you for your reply.

I know that fabric attached devices use LLDP to send C-Vlan / i-SiD request to the fabric server.

Please correct me if I am wrong:

• vlan 33 would be used in a scenario where an edge device like a server would be connected with redundant links to the VSP SMLT.

Would you know a scenario where a client switch is involved requiring vlan 33?

Much appreciated,

Klaus