CSPF/3/IGP_LINK_INFONULL: Received a link event with null information from IGP [IgpName].
A link event that did not contain any link information was received from the IGP protocol.
[IgpName]
Indicates the name of an IGP protocol, such as IS-IS and OSPF.
Received nework-lsa information is not valid.
If IGP is OSPF use display ospf lsdb opaque-link and display ospf lsdb opaque-area command.
If IGP is ISIS use display isis traffic-eng link and display isis traffic-eng network command.