What is NSSA no summary?
no-summaries —Prevent area border routers from advertising summaries into an NSSA. If default-metric is configured for an NSSA, a Type 3 LSA is injected into the area by default.
Which type of OSPF LSA is generated by an Asbr and includes external routes?
Which type of OSPF LSA is generated by an ASBR and includes external routes? Type 5 LSAs are generated by ASBRs to advertise routes learned from an external domain into OSPF. Refer to the exhibit.
What’s the LSA type when OSPF redistributes external routers to NSSA?
type 7
Redistribution into an NSSA area creates a special type of link-state advertisement (LSA) known as type 7, which can only exist in an NSSA area.
Which LSA type is used to summarize routes from one OSPF area to another?
Type 3 LSAs are used whenever a router is placed between OSPF areas. It summarizes routes as router information moves across areas.
What kind of LSA can be generated in NSSA?
Redistribution into an NSSA area creates a special type of link-state advertisement (LSA) known as type 7, which can only exist in an NSSA area. An NSSA autonomous system boundary router (ASBR) generates this LSA and an NSSA area border router (ABR) translates it into a type 5 LSA, which gets propagated into the OSPF domain.
Is the NSSA ASBR the same as NSSA ABR?
The NSSA ABR (the routers connecting NSSA to backbone area 0) translates Type 7 LSA into Type 5 LSA, and flooded into the OSPF topology. In Cisco IOS, by default, the NSSA ASBR always set the N/P-bit (Propagate) in the Options field of Type 7 LSA. The P-bit is not set only when the NSSA ASBR and NSSA ABR are the same router for the area.
Why does the ABR generate summary ASBR LSA?
This is why the ABR will generate a summary ASBR LSA which will include the router ID of the ASBR in the link-state ID field. Type 5 – External LSA: also known as autonomous system external LSA: The external LSAs are generated by the ASBR.
How to advertise external routes in NSSA?
To advertise external routes into an NSSA, the autonomous system boundary router (ASBR) creates nssa-external LSAs (type 7).