Comments:
I am not able to understand that how discouraging the IP forwarding over a link where LDP is not fully established help in LDP session establishment.
As you mentioned the reason for blackhole could be -configuration error or - An implementation bug.
Can you help me in uderstanding this.
Secondly,
"It is recommended this that both side of a link implement mechanism to be effective and to avoid asymmetric link costs which could
cause problems with IP multicast forwarding."
what exactly mean by IP multicast forwarding problems?