From Asia region (Bhutan):

> On 10 Nov 2018, at 1:03 am, im <na...@netfront.jp> wrote:
> 
> I heard that OSPF is only famous in asia region…

Not necessarily :-)

>  1. what is your backbone's IGP protocol?

IS-IS

>  2. why you choose it?

OSPFv3 was quite flaky (could have been OS bugs), and there wasn’t v4 support 
until rfc5838, so migrated to IS-IS when deploying v6 (with Philip Smith’s 
help).

But preferred multi topology to allow for incremental v6 deployment (without 
affecting v4).

—
Tashi

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