Hello
I'm having difficulty using as-path math expressions
Look at my case.
correct as-path: 65001 65002 65003
I would like to validate if the as-path of the received prefix conforms
to the as-path above. But, I would like to allow prepend of all ASes,
so:
65001 65001 65002 65003 is valid
65001 65002 65002 65003 is valid
65001 65002 65003 65003 is valid
65001 65001 65002 65002 65002 65003 65003 is valid
65001 65999 65002 65003 is NOT valid
The best expression I found was
if (bgp_path ~ [= 65001* 65002* 65003* =]) then
but it considers the path '65001 65999 65002 65003' to be valid
With regex that would be easier, but with bird bgpmask I couldn't solve
it.
Any suggestion?
--
Marcelo Balbinot
IP/MPLS Backbone Manager at AS53062
G G NET Telecomunicações
www.gegnet.com.br
INOC 53062*100
