Hi Rajesh,
The prefix reachability is always signalled via the OSPFv2 Type 3/5/7 LSAs -
this is required for Algo 0 and 1 but also for Flex Algo for basic
reachability. These LSAs carry/include the IGP metric in them. The OSPFv2
Extended Prefix TLV is used to carry the Prefix SIDs - both algo 0
Note : Discussion is not about FAPM.
For flex algorithm (example take it as 128) OSPF Prefix (For summary/external
prefixes), how to get the prefix cost ? there is no prefix cost field in
OSPFv2 Extended Prefix TLV.
Currently only way I can see is prefix needs to be advertised in flex algo
ze
