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Author Topic: SPB - Explain Technology - SMLT  (Read 2010 times)

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Offline bartounet16000

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SPB - Explain Technology - SMLT
« on: November 21, 2015, 03:47:24 AM »
Hello
We have actually 2 Nortel 8306 on network core interconected by IST link
Multiple ERS4548 Distributions Stacks are linked whith the cores by SMLT.

We had a commercial presentation about SPB
We understood interest about SPB, no tag configuration by port, security, easy to propagate VLAN through big network.

But we have question
Does SPB replace MLT/SMLT ??

If we will change 8306 by VSP 7200

Will we be forced to set SMLT before add SPB over ?

Or is what the SPB takes care of itself inteconnexion? without SMLT ?

« Last Edit: November 21, 2015, 03:56:30 AM by bartounet16000 »


Offline Dominik

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Re: SPB - Explain Technology - SMLT
« Reply #1 on: November 23, 2015, 03:35:58 AM »
Hi,

in genral SPB will be activated at all the Switch to Switch connections.
Here you can have multiple path across your network and you are not longer forced to have the classic triangle SMLT design. Of course you can have a trinagle with SPB if you like.

SMLT will not fade away completly , it is still needed for connecting Servers, firewalls, Storgae Devices....
It is no problem to have both technologys active at the same time. So you can have an SMLT over an vIST
across your two VSP7200 that connects for example an Server. And between the two VSP7200 you run SPBm.

Check out this blog post for more details:
http://networkautobahn.com/2015/02/04/multichassis-link-aggregation-in-a-spb-fabric/

Cheers
It´s always the networks fault!
networkautobahn.com

Offline bartounet16000

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Re: SPB - Explain Technology - SMLT
« Reply #2 on: November 23, 2015, 03:45:12 AM »
thanks for your answer
The commercial presentation that we had seemed to say that SMLT / MLT was necessary for activating SPB

If I understand well, by activating any switches on the SPB firm is the protocol that deals with creating interconnections without SMLT / MLT?

Offline Dominik

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Re: SPB - Explain Technology - SMLT
« Reply #3 on: November 23, 2015, 07:20:27 AM »
you would run SPB on all Switch to switch connections and SMLT only on connections to
devices that does not support SPB.

With SPB you still have the limitation that you can have only one active connection / adjancency between two switches. So if you need more bandwith between these two switches you would still configure an MLT to add additional links between the two switches, but run SPB on that MLT.
With the classic SMLT desgin you had to configure all the VLAN configurations manually on the uplinks of the core and access switches. With SPB this is no longer needed. You would just configure SPB on these Uplinks and would never touch them again. All the VLAN configurations are only needed on the Accessports.

Cheers
It´s always the networks fault!
networkautobahn.com

Offline Théo

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Re: SPB - Explain Technology - SMLT
« Reply #4 on: December 06, 2015, 04:54:10 PM »
Hi Bartounet,

If i understand, today you have two ERS8300 interconnected with an IST and few edge devices interconnected with SMLT links.
If you replace ERS8300 by VSP7200, you will have the same situation with just a little difference. IST will be replaced by Virtual-ist (IST over SPB).
So, you will need to run SPB between your core devices (VSP7200) but don't worry its very easy to use. And i'm sure you can find help here to do it if needed (I can).
About all your Edge device, you can keep it with no configuration change (SMLT/MLT) and replace it later with SPB compatible device (or not) later.

regards,
Théo
ACIS 6103 - ACSS 3605