What are the LSA types in OSPF?
OSPF LSA Types Explained
- LSA Type 1: Router LSA.
- LSA Type 2: Network LSA.
- LSA Type 3: Summary LSA.
- LSA Type 4: Summary ASBR LSA.
- LSA Type 5: Autonomous system external LSA.
- LSA Type 6: Multicast OSPF LSA.
- LSA Type 7: Not-so-stubby area LSA.
- LSA Type 8: External attribute LSA for BGP.
What is Type 7 LSA OSPF?
Type 7 LSAs are generated by ASBRs. These LSAs describe routes within a not-so-stubby-area (NSSA). Type 7 LSAs can be summarized and converted into Type 5 LSAs by the ABRs for transmission into other OSPF areas. After Type 7 LSAs are converted to Type 5 LSAs, they are distributed to areas that can support Type 5 LSAs.
What is LSA in case of OSPF?
Link State Advertisements (LSAs) are messages communicated via multicast to other routers in the OSPF domain. They are sent from internal routers to the DR/BDR routers to announce changes.
What is LSA Cisco?
The link-state advertisement (LSA) is a basic communication means of the OSPF routing protocol for the Internet Protocol (IP). It communicates the router’s local routing topology to all other local routers in the same OSPF area.
What is type 8 LSA OSPF?
A Type 8 LSA is used to give information about link-local addresses and a list of IPv6 addresses on the link. In OSPFv2, the Type 8 was originally intended to be used as a so-called External-Attributes-LSA for transit autonomous systems where OSPFv2 could replace the internal Border Gateway Protocol (iBGP).
What is the difference between LSA 5 and LSA 7?
The difference between Type-5 LSA and Type-7 LSA is that Type-7 LSA can live only into NSSA area, so it will never leave the NSSA area. Instead Type-5 LSA can be propagated to the other areas (backbone and non-backbone). – Both of them are generated by the ASBR.
What is Type 4 LSA OSPF?
OSPF Type 4 ASBR Summary LSA A type 4 LSA identifies the ASBR and provides a route to the ASBR. The link-state ID is set to the ASBR router ID. All traffic that is destined to an external autonomous system requires routing table knowledge of the ASBR that originated the external routes.
Who generates Type 4 LSA?
The type 4 LSA was generated by ABR R1 and describing the ASBR with the router ID 3.3.
Does IPv4 support OSPFv3?
The OSPFv3 process fully supports an IPv4 AF topology and can redistribute routes from and into any other IPv4 routing protocol. An OSPFv3 process can be configured to be either IPv4 or IPv6.
What is OSPFv3 used for?
OSPFv3 is a routing protocol for IPv4 and IPv6. It is a link-state protocol, as opposed to a distance-vector protocol. Think of a link as being an interface on a networking device. A link-state protocol makes its routing decisions based on the states of the links that connect source and destination machines.