You have configured MPLS and RSVP in your network using all of the Junos defaults. You
established an LSP in your network which is reporting an up status but no traffic is using it.
Which two statements reflect potential causes for this issue? (Choose two)
A.
The LSP egress address is a physical interface address
B.
family MPLS was omitted from the router configurations
C.
No BGP routes are being advertised from the remote neighbor
D.
The LSP egress address does not match the BGP next-hop address
Correct options are C and D.
When LSP is Up, next hop is usable and attractive to BGP, when LSP is Down, LSP next hop is unusable, but can still use normal IP routing to reach next hop.
But when the LSP egress address which usually is the egress router’s loopback address do not match the BGP next-hop address or there is no BGP routes being advertised from remote neighbor, it will not pass traffic.