best practice for advertising peering fabric routes

Florian Weimer fw at
Sat Jan 18 10:37:23 UTC 2014

* Patrick W. Gilmore:

> NEVER EVER EVER put an IX prefix into BGP, IGP, or even static
> route. An IXP LAN should not be reachable from any device not
> directly attached to that LAN. Period.
> Doing so endangers your peers & the IX itself. It is on the order of
> not implementing BCP38, except no one has the (lame, ridiculous,
> idiotic, and pure cost-shifting BS) excuse that they "can't" do
> this.

Any ideas why DE-CIX doesn't enforce this?

One advantage is that IXP participants can perform emergency
maintenance if they have isolated their IXP router from their own

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