BIRD / BGP / IPv6 / source address directive : auto vs link local vs GUA

[olivier a]

Hi !

I'm learning BGP and I'm really puzzled about the 'source address'
directive in the context of IPv6.
I've seen some people explicit a GUA source address
( example : source address 2001:db8:0:0::1; )
Reading the documentation, watching the debug logs and playing with bird6c
didn't help me understand.
Leaving to auto ( no directive ) was functioning ok, but my BGP setup is
rather simple.
What is better ? No directive, link local or Global Unicast Address ?

Thank you for any clue :-)
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