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Which type of OSPF link state advertisement is an AS external LSA?
Type-5
Type-5 AS external link advertisement – These LSAs are generated by ASBR to advertise routes of other Autonomous System than OSPF.
How often does OSPF send out link state advertisements LSAs )?
every 30 minutes
Although OSPF does not refresh routing updates periodically, it does reflood LSAs every 30 minutes. Each LSA includes the link-state age variable, which counts the age of the LSA packet. When a network change occurs, the LSA’s advertising router generates an updated LSA to reflect the change in the network topology.
Which type of OSPF link state advertisement advertises a summary LSA for a specific Asbr?
LSA Type 4
LSA Type 4 – OSPF ASBR Summary LSA LSA Type 4 (ASBR Summary LSA) packets are the LSAs that advertise the presence of an Autonomous System Border Router (ASBR) to other areas.
How does a LSA relate to an OSPF network?
An LSA contains routing and topology information that describe a part of an OSPF network. Routers exchange LSAs and learn the complete topology of the network until all routers have the exact same topology database. When two neighbors decide to exchange routes, they send each other a list of all LSAa in their…
What does the link state advertisement ( LSA ) do?
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.
How does OSPF communicate with other local routers?
It communicates the router’s local routing topology to all other local routers in the same OSPF area. OSPF is designed for scalability, so some LSAs are not flooded out on all interfaces, but only on those that belong to the appropriate area.
How are opaque LSAs used in link state database?
Opaque LSAs are used to flood link color and bandwidth information. Standard link-state database (LSDB) flooding mechanisms are used for distribution of opaque LSAs. Each of the three types has a different flooding scope. For all types of LSAs, there are 20-byte LSA headers.