Mailing List Archive: VxLAN EVPN decision

VxLAN EVPN decision

Apr 29, 2020, 12:10 PM

Post #1 of 3 (733 views)

Folks,

when someone should decide to go with VxLAN EVPN base clos design or
Tier 3 (core/dist/access) design? what criteria decide which design
would be best fix?

Following criteria in my mind.
1. North/South Vs east-west traffic
2. BUM suppression ( Classic design doesn't help here)
3. If you hate STP (but vPC is exception)
4. scale (STP has limitation because of large L2)
5. complexity (Classic Tier 3 is easy to configure and manage)

what other things people keep in mind to decide go with Tier 3 vs Clos
(VxLAN+EVPN)
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Re: VxLAN EVPN decision [ In reply to ]

nick at foobar

Apr 30, 2020, 2:32 AM

Post #2 of 3 (725 views)

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Satish Patel wrote on 29/04/2020 20:10:
> what other things people keep in mind to decide go with Tier 3 vs Clos
> (VxLAN+EVPN)

implementation cost and whether there's a requirement for a service
guarantee. Clos will guarantee capacity between ingress and egress
stages, but this comes at a cost.

Nick
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Re: VxLAN EVPN decision [ In reply to ]

adamv0025 at netconsultings

Apr 30, 2020, 8:02 AM

Post #3 of 3 (723 views)

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> Satish Patel
> Sent: Wednesday, April 29, 2020 8:10 PM
> To: Cisco Network Service Providers <cisco-nsp@puck.nether.net>
> Subject: [c-nsp] VxLAN EVPN decision
>
> Folks,
>
> when someone should decide to go with VxLAN EVPN base clos design or
> Tier 3 (core/dist/access) design? what criteria decide which design would
be
> best fix?
>
> Following criteria in my mind.
> 1. North/South Vs east-west traffic
> 2. BUM suppression ( Classic design doesn't help here) 3. If you hate STP
(but
> vPC is exception) 4. scale (STP has limitation because of large L2) 5.
> complexity (Classic Tier 3 is easy to configure and manage)
>
> what other things people keep in mind to decide go with Tier 3 vs Clos
> (VxLAN+EVPN)
>
I'd go with MPLS+EVPN -nowadays all data-centre gear supports MPLS in
addition to IP.
With regards to the 3-tier vs folded clos model (vs benes model) I guess one
could evaluate them from the modularity viewpoint for example -more
precisely how many classes of nodes you want to maintain,
3-tier = 3 types,
Clos = 2 types,
Benes = 1 type,
- and how this affects your scaling.

adam

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