Hello,
SCU can be used in this scenario
http://www.juniper.net/documentation/en_US/junos14.2/topics/task/configuration/scu-or-dcu-configuring-junos-nm.html

To drop traffic matching your chosen SCU in a firewall filter, use

set forwarding-options family inet filter output YouRscUfilteRname

But - have You ever heard of IP source address spoofing?
HTH
Thanks
Alex

On 28/07/2015 23:49, tim tiriche wrote:
Hello,

Goal: on transit provider link, allow ASN XYZ to reach port 80 and drop all
other destined to port 80?


I don't want to build a static filter as ASN XYZ could have additional
updates.
Not sure if flowspec can match on as-path?

Any pointers would be helpful.

Thanks,
-Tim
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