EVO ACX - Traffic is being forwarded out of an Inter-AS option B link without a label being imposed.

1.) This is applicable to all EVO ACX platforms.

2.) The device was acting as an ASBR-PE that is it has a VRF instance configured for L3VPN service along with an Inter-AS Option B link.

3.) Traffic was being forwarded out of the Inter-AS option B link without a label being imposed resulting in traffic blackhole on the peer side.

1.) The following configuration lines (rib group leaking) are required along with the fix, for the resolution of direct in inet3 in the ASBR-PE scenario. 

set groups ps_conf routing-options interface-routes rib-group inet ifrg-inet0-to-inet2-and-inet3

set groups ps_conf routing-options interface-routes rib-group inet6 ifrg-inet60-to-inet62-and-inet63

set groups ps_conf routing-options rib-groups ifrg-inet0-to-inet2-and-inet3 import-rib inet.0

set groups ps_conf routing-options rib-groups ifrg-inet0-to-inet2-and-inet3 import-rib inet.2

set groups ps_conf routing-options rib-groups ifrg-inet0-to-inet2-and-inet3 import-rib inet.3

set groups ps_conf routing-options rib-groups ifrg-inet60-to-inet62-and-inet63 import-rib inet6.0

set groups ps_conf routing-options rib-groups ifrg-inet60-to-inet62-and-inet63 import-rib inet6.2

set groups ps_conf routing-options rib-groups ifrg-inet60-to-inet62-and-inet63 import-rib inet6.3

set groups ps_conf routing-options forwarding-table chained-composite-next-hop transit l3vpn

set apply-groups ps_conf

1.) Fix of PR1794718 is required to ensure "routing-options forwarding-table chained-composite-next-hop transit l3vpn" is enabled.

PR Reference:

https://prsearch.juniper.net/problemreport/PR1794718