Hello,
I'm trying to replace two cisco routers by two openBGPd routers.
A have 3 neighbors, two with 4-bytes AS, and one which only supports
2-bytes AS for now.
I have a 4-bytes AS too.
So in my bgpd.conf, I have :
...
AS <my 4bytes> <a 2bytes AS>
network z.z.z.z/21
...
neighbor <neighbor's ip address> #a neighbor which supports 4 bytes AS
{
remote-as <neighbor's AS>
set prepend-self 1
}
...
neighbor <neighbor's ip address> #a neighbor which supports 2 bytes
AS only
{
remote-as <neighbor's AS>
set prepend-self 2
}
...
My problem is that my second neighbor return this message :
neighbor : received notification: error in UPDATE message, AS-Path
unacceptable
I think bgpd is trying to prepend the neighbor which does not support
4bytes AS with... a 4 bytes AS, due to the "set prepend-self 2".
Now, time for the questions :
- Is it openBGPd's normal behavior ?
- Is there a way to force prepending with the 2 bytes AS ? I saw
"announce as-4byte (yes|no)" in manpage, is this option designed for that ?
Thanks for your replies.
Regards,
Cédric
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