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What is the purpose of type 2 LSA?
Type 2 – Network LSA – the designated router (DR) on a broadcast segment (e.g. Ethernet) lists which routers are joined together by the segment. Type 2 LSAs are flooded across their own area only. The link-state ID of the type 2 LSA is the IP interface address of the DR.
Why does OSPF have multiple areas?
The reason you would create multiple area types is to avoid overwhelming routers with a huge routing table and topology database when they do not need to understand this information. To reduce router overhead in a large OSPF network, you can create different types of areas.
Why do we need Type 4 LSA in OSPF?
So, a type-4 asbr-summary LSA is needed to help make the ASBR reachable and, by extension make the associated type-5 prefix valid. The type-4 acts like a glue record, and uses the ABRs well known RID as a care-of address for the ASBR and it’s advertised prefixes.
What are OSPF LSAs?
LSA Type 1 (Router LSA) packets are sent between routers within the same area of origin and do not leave the area. An OSPF router uses LSA Type 1 packets to describe its own interfaces but also carries information about its neighbors to adjacent routers in the same area.
What is the difference between OSPF and multiple OSPF?
The OSPF link state routing protocol must be pre-configured in the network. Only two OSPF speakers use the interface between which OSPF Multi-Area functionality works. Multi-Area OSPF only works on Point-to-Point network types.
How many LSA are in OSPF?
6 Types of OSPF LSA.
Is there such a thing as a summary LSA in OSPF?
The name “summary” LSA is very misleading. By default OSPF is not going to summarize anything for you. There is however a command that let you summarize inter-area routes. Take a look at my OSPF summarization lesson if you are interested.
What do R3 and R4 need to know about OSPF?
R3 and R4 also need to know about the networks in Area 2. R2 is going to create a Type 3 summary LSA and flood it into area 0. This LSA will flood into all the other areas of our OSPF network. This way all the routers in other areas will know about the prefixes from other areas.
How to generate a type 2 router LSA?
Each router will then generate a Type 1 however ONLY the DR will generate the type 2 LSA. The routers will generate a router LSA that is 36 bytes that include 1 link – Transit (type 2). The Link ID will be the IP of the DR, and the Link Data will be the IP of the Router.
Why do I need a router LSA for PTMP?
When configuring the router’s interface for PTMP, the router LSA will contain Point to Point links (to describe each neighbor) and a single stub network to convey the subnet information. Each router will have to generate this Router LSA which can be used to deduce the topology – as you correctly stated in your post.