[j-nsp] Big flows up to 320 Gbs

[james list]

Hi
Can you elaborate the concept of L3 vs L2?

I was thinking to have L2 versus the server in A/A (vc or mclag) or A/P
(plain vlan among two switches) and a vrrp over the two switches.

Are you talking to have L3 (routed port) on each switch interface versus
server ?

Cheers
James

Il Lun 28 Set 2020, 09:42 <adamv0025 at netconsultings.com> ha scritto:

> > james list
> > Sent: Saturday, September 26, 2020 11:57 AM
> >
> > Dear experts
> > I have a project to connect at layer2 level 16 servers (two interfaces
> > each) with a total of 32 x 10Gbs server interfaces in order to setup a
> big
> data
> > solution.
> >
> > These interfaces must have in normal conditions full L2 bandwidth
> available
> > to transmit among themselves and redundancy of switch (if there is a
> fault
> > condition 160 Gbs is enough).
> >
> > Since this kind of huge bandwidth requirement could cause bottlenecks in
> > Datacenter Lan environment I was thinking to setup a separate lan
> > architecture.
> >
> > I was thinking to setup a virtual chassis environment with 2 x qfx5100
> with
> > multiple 40 Gbs interfaces to set vc ports.
> >
> Couple of thoughts,
>
> Routing vs switching
> First of all try to push for a L3 solution if the app itself doesn't
> support
> it look into routing on host (cRDP, etc...) -so that all you need to worry
> about outside of hosts is routing (not switching).
> With L3 you don't need to worry about split brain scenarios with virtual
> chassis or multi-chassis lag,
>
> Scalability and throughput,
> Note that creating a dedicated 2 x qfx5100 pod will limit the solution to
> the bandwidth of a single qfx5100, which may or may not be sufficient to
> grow the solution in future.
> Migration to a standard folded Clos fabric will then be complicated if
> needed.
> Also note that qfx5100 might have throughput limitations at smaller than
> 1500B packet sizes, so check with the app team on expected packet size and
> compare that with the switch specs or best do your performance testing.
>
> Buffers,
> If you start to mix and match 40s and 10s (in failure condition) you need
> to
> worry about buffers in the stepdown from 40 to 10.
>
>
> adam
>
>
>