Hi, On Thu, Nov 15, 2018 at 10:22:51AM -0600, Aaron1 wrote: > Well, I???m a data center rookie, so I appreciate your patience > > I do understand that layer 2 emulation is needed between data centers, if I > do it with traditional mechanisms like VPLS or l2circuit martini, I???m just > afraid if I make too many connections between spine and leaves that I might > create a loop
Since these connections are all *routed*, the routing protocol takes care
of loops. There is no redundant L2 anything (unless you do LACP links,
but then LACP takes care of it) that could loop.
The "user-visible layer2 network" stuff emulated via VXLAN, MPLS, ...
might form loop, so how you attach downstream L2 "infrastructure" will pose
some challenges - but this is totally independent from the leaf/spine
infra.
> However, I???m beginning to think that EVPN may take care of all that stuff,
> again, still learning some of the stuff that data centers due
EVPN is, basically, just putting a proper control-plane on top of MPLS
or VXLAN for "L2 routing" - put your MAC addresses into BGP, and it will
scale like hell.
ISPs I've talked to like EVPN, because "this is BGP, I understand BGP".
Enterprise folks find EVPN scary, because "this is BGP, nobody here knows
about BGP"... :-) (and indeed, if BGP is news to you, there are way too
many things that can be designed poorly, and half the "this is how you do
a DC with EVPN" documents design their BGP in ways that I wouldn't do...)
gert
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany [email protected]
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