What exactly is meant by a flat network? Please read on before you give a quick answer.
I have some definite ideas, but I would love to hear other people's inputs, ideas and perceptions.
The trend in the data center is to go in the direction of flat networks, which to me means that the multi-tiered architectural model can be collapsed into 2 layers. Juniper says they will collapse the data center into one tier: the Stratus project promises the equivalent of one gigantic logical switch.
So, the implication is that there will be a flattening of the network in 2 ways: first, in terms of physical layers of networking and secondly, in terms of creating one logical L2 domain that is horizontally expanded (across data centers, too), but the redesigned L2 domain will not require STP, blocked uplinks, or unknown unicast flooding.
I do require some clarification:
1.) How exactly can the access and aggregation layers be flattened? If, for example, one can stack all the top of rack (accesss layer) switches to create a single virtual chassis and then do the same, or something similar, like VSS, to the aggregation layer, the result is that each layer will see the other layer as one switch. So, 10 access switches will look like 1 switch to the aggregation layer, and 2 aggregation layer switches will look like 1 switch to the access layer. This will allow one to create multi-chassis etherchannels that can expand the network horizontally, HOWEVER, there are still 2 layers of networking.
Does this make sense?
2.) The value in spanning L2 domains across data centers in a services-oriented architecture is clear. It facilitates vMotion and vStorage and creates clusters of compute and storage resources, which can be leveraged for SAN replication, disaster recovery, cloud computing (IT/Software as a Service), and running active/active application services).
But does flattening the network mean that there will be one massive subnet that will be considered one broadcast domain? Albeit, unicast flooding and ARPs will have to be re-engineered to operate in this environment. This doesn't seem likely.
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==================== VIC FNIC driver does not support Virtual Volumes (
second level LUN ID ) An enhancement request has been created to track
this feature - CSCux64473 UPDATE - 12-14-2016 We made some traction on
the enhancement request - The Fix is in t...