What Is OSPF Router LSA? (Link ID, Routing Table OSPF 2.1)

Q1.What LSA router?

Q1.What LSA router?

Answer: It is also called Type-1 LSA.A router running OSPF creates an LSA type-1 to describe its interface IP addresses and link costs.During startup of OSPF, the router creates a router LSA for describing their relationship.

Q2.Why Type-1 LSA?

Answer.Hosts connected to the routers need to learn from each other IP addresses and how to reach the other.Alternatively, static routing.But it will not scale.OSPF each router to create its own Type-1 LSA and floods during the entire construction of relations of contiguity.Therefore, the routers in a region are able to discover the addresses of other routers link and how to achieve them.

Q3.What is the relationship of identity in the LSA router?

Answer: Router LSA describes its links.Each link is indicated by a link ID, which is represented by Router ID, the IP interface, or subnet address based on the nature of the link.

For example, in this simulation, R3 has three interfaces.

- Link 1: R3-R11 is connected by a serial link.

- Link 2: R3 is connected to R1 with an Ethernet link (sub-network multi-access.) R3 is elected DR.

- Link 3: R3 is connected to a subnet host.No OSPF router attached.

Now we'll see how to specify links:

Link ID Interface IP address Link type Description

# 1 S0 / 0 1.1.1.1 1.1.1.1 Point to Point Router ID is the ID of the connected router (R1)

# 2 E0 / 0 10.1.1.1 10.1.1.1 transmission of this sub-network routers OSPF.Link ID is Dr. IP interface.

# 3 E0 / 1 network 192.168.1.1 192.168.1.1 host this sub-network has no router OSPF.Link ID is the address of the subnet.

Q4.What are the bits of EBV type-1 LSA?

Answer: V = 1 if the router uses a virtual link to establish full adjacency with router anthers.

E = 1 if the type of LSA-1 is created by an ASBR.

B = 1 if the router is an ABR.

Q5.What is the scope of type-1 LSA floods

Answer: With the region.

This article is the FAQ interactive simulation OSPF: Router LSA.To test this interactive simulation, click the external link below.

What Is OSPF Router LSA? (Link ID, Routing Table OSPF 2.1)

By: bessieg

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