[FROG] OSPF: scaling routers in area or areas per se

[James Bensley]

On Tue, 21 Sept 2021 at 15:34, Muenz, Michael <m.muenz at spam-fetish.org>
wrote:

> - Have only one area 0.0.0.0 also on the branches, so over 100 routers
> in one area
> - Have for each branch one area, so over 100 areas having only one router
> - Running external via BGP and having 100 neighbors with 100 private AS
>
> Anyone here experienced regarding scaling this size?
>

I can't comment on FRR specifically, but the last option is the general
approach taken in the service provider world. Note; you can use the same
ASN at each branch site with BGP Site of Origin + "allow-as in". Both of
these BGP methods are very common in the SP world, and scale much higher
than OSPF for this purpose (CE to PE connectivity). If the end site LANs
ranges raley change then there is no more scalable option than static
routes. If you can - go with static routes.

Cheers,
James.
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