The ASBR-summary LSA is:().
- AGenerated by the ASBR and describes reachability to itself
- BGenerated by the ASBR and describes reachabilty to the ABR
- CGenerated by the ABR and describes reachabilty to the ASBR for routers in a different area from the ASBR
- DGenerated by the ABR and describes reachabilty to the ASBR for routers in the same area with the ASBR