What is link-state ID in OSPF?
The link-state ID is the router ID of the described ASBR for type 4 LSAs. Type 5 – External LSA – these LSAs contain information imported into OSPF from other routing processes. They are flooded to all areas unchanged (except stub and NSSA areas).
Which type of OSPF router will generate Type 3 LSAs?
OSPF Area Border Routers (ABRs) are used to connect OSPF areas. The ABR generates type 3 LSAs to advertise networks between areas.
What information is advertised in a type 4 LSA?
An OSPF type 4 summary LSA is generated by an ABR only when an ASBR exists within an area. A type 4 LSA identifies the ASBR and provides a route to it so the routing table will have an entry for traffic that is destined for the external autonomous network.
Which is the link state ID in OSPF?
In an OSPF router LSA (LS Type 1), the Link State ID is the Router ID of the originating router. The Advertising Router used to identify the sender is also the Router ID. So does it mean that the two parameters will always be same for every type 1 LSA. Can you point a use case where it is not?
What is the advertising router ID in OSPF?
The Advertising Router is the Router ID of the router that originated the LSA. With LS Type 1 LSAs, these two pieces of information happen to be identical, but that is not the case for other LS Types.
What are the different types of LSA in OSPF?
The original IPv4 -only OSPFv2 and the newer IPv6 -compatible OSPFv3 have broadly similar LSA types. The LSA types defined in OSPF are as follows: Type 1 – Router LSA – the router announces its presence and lists the links to other routers or networks in the same area, together with the metrics to them.
How does OSPF detect a duplicate router ID?
An OSPF neighbor is responsible for reencapsulating the appropriate LSAs in new Update packets for further flooding in order to propagate OSPF LSAs beyond the network on which they were originated. Thus, a duplicate router ID can be detected by, and propagated by multiple routers.