Question on routing of Tata AS6453 with their other network AS4755

Anurag Bhatia me at
Mon Nov 18 08:01:46 UTC 2013

Heu Michael

But this time AS4755 wasn't their customer. It's their own network in

I think probably it will be hard for us and in general for technical
community to comment on business side of it but I am just curious on
technical side on what it is like that? Is it missing iBGP sessions or just
intentional filtering of a group of prefixes via a peer group or based on
some community tag?


On Sun, Nov 17, 2013 at 11:16 PM, Michael Smith <mksmith at> wrote:

> On Nov 16, 2013, at 11:49 AM, Anurag Bhatia <me at> wrote:
> > Hello everyone
> >
> >
> > I was looking around and noticed a pretty bad route from DTAG to Tata
> > AS6453 (basically destination was Tata Comm's Indian network on AS4755).
> I
> > am not able to understand cause for inefficient routing but I am sure I
> am
> > failing to understand something which is crazy in their IGP. The result
> is
> > that route from Europe to India is via Europe > US > Singapore > India
> > rather then direct India.
> >
> <snip>
> I think you'll find that these decisions are intentional and driven by the
> cost of routes headed direct over land from EU to India.  Ask Tata for a
> price quote for transit internet services in the EU and, separately, for
> transit internet in the EU that go direct from EU to India.  They are not
> the same price.
> Regards,
> Mike


Anurag Bhatia

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