Hi Paul,
Clearly if you have bunch of legacy applications which require L2 and
are not capable of crossing L3 you need to provide them the L2 network.
But beyond that I really do not see a need for VLANs. Subnet - of course
- but within a given tier ... more ... withing given TOR.
What would be any other reasons to be stack with L2 for DC transport ?
Best,
R.
> Not sure you can avoid it completely, nor do I know that everyone
else in the industry wants to avoid it either. As avoiding VLANs
doesn't address the LANs needed to support clusters of servers acting as
any single tier of the application model described below. Web clusters,
app clusters, etc...
It's a fine balance that is flexible today because we can use the VLANs and IP
subnets appropriately depending on the need and scale. We should be sure not
to box ourselves into a one size fits all mentality. InterVLAN routing inside a
VRF is very appropriate for many DC's for example and used today.
--
Paul Unbehagen
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