BGP attributes through IGP

Blake Dunlap ikiris at
Fri Mar 7 03:53:13 UTC 2014

Mpls, GRE, line gun...

At some point, you want to stop beginning technical designs with "Doctor!
Doctor! It hurts when I do this. What can I do?"

The answer doesn't generally change, no matter how many times it's asked.


On Thu, Mar 6, 2014 at 6:19 PM, Glen Turner <gdt at> wrote:

> Saku Ytti wrote:
> >
> > It's essentially abusing (some what well-defined and interoperable
> abuse) 32b
> > tag field for this purpose.
> That's pretty much what the OSPF tag and the BGP's synchronisation with
> OSPF were originally intended for.
> However it's pretty much a design misfeature and you'd be happier with
> iBGP over a tunnel
> -glen

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