Re: Routing parts of another LIR's PA block

Somewhere in Basham Halabi's "Internet Routing Architectures" (Cisco Press) he mentions that two different origins for a prefix is an "illegal configuration". Unfortunately I just can't find the exact phrase in the book.

Anyway, I am sure that announcing the same prefix under 2 different origins should work although I never did something like this.

Indeed, it happens today, and my guess is that it works, or networks wouldn't do it (not necessarily a valid assumption, I know). :) Shane