Wired Intelligent Edge (Campus Switching and Routing)

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New Contributor

SAN 3810M Stacking

What would be the best way to add a pair of stacked 3810M switches to our existing SAN of two ProCurve 6600s that are configured in a distributed trunk? Would it be best to create a trunk that spans both 3810s over to the first 6600, and another similar trunk destined for the second 660? I wasn't sure what kind of trunk to implement and if you could split it across the stacked 3810s.

6600 has only 4 SFP+ ports with the rest 1 Gig Ethernet.

3810M has 16 SFP+ ports.

Regular Contributor II

Re: SAN 3810M Stacking

Hi

If you stack two 3810M switches they logically become one switch. And if the 6600 have a distributed trunk you could setup a trunk (two ports total, one per 3810M) to the first 6600 and a second trunk to the second 6600. Setup is up as you would connect a server redundant to both 6600’s.

On the 3810M setup the trunk as a lacp, on the 6600 as a dt-lacp if I am not mistaken. But this was some time ago and I can’t test it in my lab. No legacy hardware, sorry. So check with manual of 6600 to be sure.

Hope it helps
Cheers, Frank
Aruba Partner Ambassador| AMFX#22| ACCX#613| ACMX#733| ACDX#744

If you like my posts, kudo's are welcome. If it solves your problem, please click 'Accept as Solution'
Aruba Employee

Re: SAN 3810M Stacking

Frank is right, you would configure dt-lacp LAGs on the 6600s and LACP LAGs on the 3810s like so:

 

6600(config)# trunk 20,21 trk1 dt-lacp

 

3810(config)# trunk 1/1,2/1 trk1 lacp

 

Justin

New Contributor

Re: SAN 3810M Stacking

Ok, thanks, Justin. So that would be for the first 6600? The second would be similar, correct? ...

 

6600 primary to 3810 stacked:

6600(config)# trunk 20,21 trk1 dt-lacp

3810(config)# trunk 1/1,2/1 trk1 lacp

 

6600 secondary to 3810 stacked:

6600(config)# trunk 20,21 trk2 dt-lacp

3810(config)# trunk 1/2,2/2 trk2 lacp

New Contributor

Re: SAN 3810M Stacking

Also, why would the 6600 need to be configured in dt-lacp vs standard lacp? If the stacked 3810s are logically one switch, shouldn't it be lacp on both sides of the trunk?

Regular Contributor II

Re: SAN 3810M Stacking

Because the 6600 does distributed trunking!!!

And the 3810M doesn’t.

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Cheers, Frank
Aruba Partner Ambassador| AMFX#22| ACCX#613| ACMX#733| ACDX#744

If you like my posts, kudo's are welcome. If it solves your problem, please click 'Accept as Solution'
Aruba Employee

Re: SAN 3810M Stacking

Yes, that configuration would be correct.

 

As with what Frank said, since we're using DT, we need to use the dt-lacp option so that the DT-LACPDUs can be sent out over the DT pair's links to share the LAG information between the DT pair and 3810s.

 

Justin

New Contributor

Re: SAN 3810M Stacking

Sorry to beat this horse to death, but one more question... I would think the DT-LACP would be configured on the 6600 if the design was like the second one below. Can you confirm, or explain the difference between the two? Thanks!

 

Design 1

6600 primary to 3810 stacked:

6600(config)# trunk 20,21 trk1 dt-lacp

3810(config)# trunk 1/1,2/1 trk1 lacp

 

6600 secondary to 3810 stacked:

6600(config)# trunk 20,21 trk2 dt-lacp

3810(config)# trunk 1/2,2/2 trk2 lacp

 

Design 2

6600 primary:

6600(config)# trunk 20 trk1 dt-lacp

6600(config)# trunk 21 trk2 dt-lacp

 

6600 secondary:

6600(config)# trunk 20 trk1 dt-lacp

6600(config)# trunk 21 trk2 dt-lacp

 

 

3810 stack:

3810(config)# trunk 1/1,1/2 trk1 lacp

3810(config)# trunk 2/2,2/2 trk2 lacp

 

 

 

Aruba Employee

Re: SAN 3810M Stacking

 

You'll want the trunks balanced over the 3810 stack for redundancy in the case of a stack member issue/failure.

 

 

 

Regular Contributor II

Re: SAN 3810M Stacking

Hi

The 3810M stacked can be considered as one logical switch. But the two 6600’s are NOT one logical switch. As there will be a link between the two 6600’s you need to try to avoid spanningtree.
So on the 3810M stack create a trunk (lacp) out of 4 interfaces. Two will be connected to 6600-1 and two will be connected to 6600-2. On both 6600’s create a two port dt-lacp based trunk. And the 6600’s will have a isl between them.
From the view of the 3810M it can be considered as a 4 port lacp.

Hope this helps
Cheers, Frank
Aruba Partner Ambassador| AMFX#22| ACCX#613| ACMX#733| ACDX#744

If you like my posts, kudo's are welcome. If it solves your problem, please click 'Accept as Solution'
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