Symptoms It's been a long standing ask for XR to support conditional route advertisements in BGP. The expected option of using the             if rib-has-route option in RPL currently can only be used at the default-information originate attachpoint to conditionally advertise a default route out.   The actual request is documented under  CSCue04899     Allow 'rib-has-route' for outbound rpl there are some reasonable technical limitations as to why it has not happened yet, but there is a neat workaround that I would like to share that provides the exact same behavior! Components involved The logic of the workaround solution is as follows: In BGP one defines a network statement for the route that needs to be conditionally advertised. (One could possible instead of a network statement also use redistribute static with a route-policy using a  prefix-set) This network statement's prefix is defined as a static route under router static The static route references the outgoing interface Null0 and a object track definition The object track definition references something that you want to track.   The tracking options include:   bfdrtr         track type bfd rtr   line-protocol   track type line-protocol; the line protocol of an interface, this interface can be l2transport or an l3 interface of any kind   list           track type list; this allows you to track other track definitions in an  AND or OR manner   route           track type ipv4 route ; the presence of a route   rtr             track type ipsla; an IPSLA probe to verify an end to end connectivity or port or anything that IPSLA can monitor! Detailed Solution This example talks you through a solution of using the BGP network statement, a conditional static route and the dependency  on an interface line state   Config pieces: Static route that is conditional with a tracker called MYIF router static address-family ipv4 unicast   192.168.123.0/24 Null0 track MYIF   Tracker MYIF that checks a lineprotocol state: track MYIF type line-protocol state   interface TenGigE0/2/0/3   BGP configuration that advertises a prefix (that is now conditional) router bgp 64524 address-family ipv4 unicast   network 192.168.123.0/24   Sample operation: Tracking interface is DOWN: LC/0/2/CPU0:Jun 12 09:41:33 : ifmgr[210]: %PKT_INFRA-LINK-3-UPDOWN : Interface TenGigE0/2/0/3, changed state to Down  LC/0/2/CPU0:Jun 12 09:41:33 : ifmgr[210]: %PKT_INFRA-LINEPROTO-5-UPDOWN : Line protocol on Interface TenGigE0/2/0/3, changed state to Dn    Verify the static route is not there:   RP/0/RSP0/CPU0:A9K-BNG(config-if)#do sh route static | i 192.168.123 Wed Jun 12 09:41:18.977 EDT RP/0/RSP0/CPU0:A9K-BNG(config-if)#   Now bring up the interface, in this case it is not connected so i force it up with a loopback RP/0/RSP0/CPU0:A9K-BNG(config-if)#loop int RP/0/RSP0/CPU0:A9K-BNG(config-if)#commit Wed Jun 12 09:41:33.044 EDT LC/0/2/CPU0:Jun 12 09:41:33 : ifmgr[210]: %PKT_INFRA-LINK-3-UPDOWN : Interface TenGigE0/2/0/3, changed state to Up  LC/0/2/CPU0:Jun 12 09:41:33 : ifmgr[210]: %PKT_INFRA-LINEPROTO-5-UPDOWN : Line protocol on Interface TenGigE0/2/0/3, changed state to Up    Notice the tracker detects it and ups the object! RP/0/RSP0/CPU0:Jun 12 09:41:33 : object_tracking[359]: %SERVICES-OT-6-TRACK_INFO : track MYIF state Track_Up    Verify the static route again: RP/0/RSP0/CPU0:A9K-BNG(config-if)#do sh route static | i 192.168.123 Wed Jun 12 09:41:58.463 EDT S    192.168.123.0/24 is directly connected, 00:00:24, Null0   Interface that is tracked configuration. Note that you can also track l2transport interfaces!! interface TenGigE0/2/0/3  description InternalLoop-trackertest   loopback internal  l2transport  !   cheers! xander     =====  Xander Thuijs, CCIE #6775 Distinguished Engineer ASR9000/NCS5500/IOS-XR       ... View more