MLAG + Stacking

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Create Date: Mar 28 2012 11:51AM

Hi,

I would like to know if there are any limitation about configuring MLAG on a Summit X670 stacking environment. The topology will be as follows:

- Servers connected to Summit x670 siwtches on stacking using MLAG for each VLAN
- Summit X670 switches connected to blackdiamonds using MLAG (MLAG managed by Blackdiamonds).

Thanks,
Rigo


(from Rigoberto_Rojas)
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Posted 5 years ago

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Create Date: Mar 28 2012 12:31PM

Hey Rigo

Just to clarify there are two stacks of 670s correct?

If so then yes you can MLAG the servers to th 670 stacks and then MLAG the stacks to the BDs. This is a mesh design and is covered in the concepts guide.. not the connections from the stacks to the BDs need to be created on both sides. For example each 670 will have a share that spans the BDs as a MLAG but the BDs will need to have a share that span the stacks as MLAGs.

This is covered in the concepts guide.

P

(from Paul_Russo)
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Create Date: Mar 28 2012 1:13PM

Hi,



You mean "EXOSConcepts15.1.pdf" file?. Because the only similar reference on that document that I found was a Two-tier diagram and no references to Stacking switches topology

Regards,

Rigo

(from Rigoberto_Rojas)
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Create Date: Mar 28 2012 2:14PM

So by stacking switches you just mean stacks versus standalone switches. That is the correct area of the guide and the two-tier is the design.

Don't worry about the pictures what matters is that the two MLAG peers are the same. This is from the concepts guide

MLAG peer switches must be of the same platform family. The following MLAG peers are allowed:
BlackDiamond 8800 switches with BlackDiamond 8800 switches, BlackDiamond X8 switches with
BlackDiamond X8 switches, Summit switches with Summit switches, and SummitStack with
SummitStack.

Does that help?

P

(from Paul_Russo)
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Create Date: Mar 29 2012 3:23PM

Hi,

You're right, I meant stacking switches versus standalone switches. What I understand on Two-Tier MLAG Network guide, what I have to do is to split the MLAG's between the Summit (stacking) and the Blackdiamonds. For example:

- If I have 6 VLANs, I will assign the first 3 as MLAG on the Summit switches and normal LAG on Blackdiamonds side. For the last 3 VLANs will be MLAG on Blackdiamonds side and normal LAG on summit side.

Is that right?

Thanks
Rigo

(from Rigoberto_Rojas)
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Create Date: Mar 30 2012 6:09AM

Hey Rigo


Yes that is correct understand that you can have all the VLANs on the Summits or on the BDs. The part to remember is that when creating the two tier MLAG the Summits will be normal sharing going to the BDs which will have the MLAG configuration covering all of the ports from the summits. In addition the BDs will have normal sharing going to the Summits which will have MLAGs covering all of those ports.

So in your design you will have the Summits be MLAG peers for servers covering 3 VLANs as well as the links from the BDs and the BDs will be MLAG peers for ports covering the other 3 VLANs as well as the ports from the Summits.

Also when creating the share groups do not use LACP use static configuration.

Hope that helps.

P

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Create Date: Apr 29 2012 10:05AM

Thanks!

I will have the same topology on a remote site (Stacked SummitX670 connecting the servers and Blackdiamond that will provide ESRP Layer3 and layer MLAG with Summit Switches connectivity). The idea is to connect these two remote sites using the same blackdiamonds with MLAG+ ESRP+ OSPF configuration using redundant links. My concern is that, I'll have 2 10Gb intersiwtch physical links (configured as LACP in order to form a 20Gb link) connecting the blackdiamonds. That link will be used for MLAG communication and all other communication needed (ESRP, OSPF), but I've read that there is a layer limitation regarding this ISC links . Do you think It will cause any problem?.

BR
Rigo

(from Rigoberto_Rojas)

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