List and Explain the Different Types of Lsa in Ospf

LSAs Type 1 are only sent among OSPF routers in the same area so we see R5 R6 and R7 here which are in Area 2 only. Area ID is the 32 bit area ID assigned to an interface sending an OSPF packet.

Ospf Lsa Types Ccna Cisco Networking Computer Network

Router LSA Type 1 Network LSA Type 2 ABR Summary LSA Type 3 ASBR Summary LSA Type 4 ASBR Externel LSA Type 5 Group Summary Type 6 NSSA External LSA Type 7 External Attributes LSA Type 8 Opaque LSAs Type 9 10 11.

. In type 1- router LSA all the OSPF router communicates with LSA In type 2 network LSA it is employed in DR or BDR election across a multi-access network. 6 Types of OSPF LSA. IP Network - Connection to stub network Link Type 4.

The link state ID is the IP address of the subnet that is being advertised. So here we know R5 and R7 are the DRs. Learn about these types overviews.

I am hoping you will understand it quite easily. Connection to transit network Link Type 3. An OSPF router uses Type 1 LSA to describe its own interfaces but also carries information about its neighbors to adjacent routers in the same area.

As a rewind please go through my last post which explains Type-1 and 2 Router LSA of OSPF. IP address of DR. 6 Types of OSPF LSA The OSPF LSA types define different router types.

Type 1. Type 5 LSA is External LSA which is generated by Autonomous System Boundary Router ASBR. Neighbor Router ID - Point-to-point connection to another router.

The LSA contains a list of the directly connected interfaces link types and link states. Usually the test types are Type1 Type2 Type3 Type4 Type5 and Type7. NSSA external routes LSA type 7.

There are different types of LSA but for now we are going to focus on type 4 LSA aka Type 4 Summary ASBR AS Boundary Router LSAThe type 4 LSA is generated from the ABR Area Border Router to inform the routers in another area where the ASBR is located and what the cost is to reach it. 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. Some of the OSPF LSA types are the main LSA types that are used in OSPF operations often.

LSA TYPE 4. -AKA router link entries. OSPF LSA Type 1 OSPF Router LSA.

If you want to verify you can check it with the show ip ospf neighbor command. Created by each router to describe their directly connected networks. Lets see all the LSA types.

Here Type specifies the OSPF packet type. External routes LSA type 5. Created by the DR and contain the RID of the routers on the same segment along with the network mask.

Neighbor Router ID - Virtual Link. This LSA is not flooded beyond the borders of their associated area. Type 4 LSA is the Summary LSA which is created by Area Border Routers ABR and transported to other areas to create shortest path three of an Autonomous System Boundary Router ASBR LSA TYPE 5.

R3 and R4 also need to know about the networks in Area 2. These do not leave the area. In type 3 summary LSA LSA helps area border router to exchange the inter-area data.

In the OSPF there are 5 different types of packets. OSPF Type 1 LSARouter LSA packets are sent between routers within the same OSPF area and do not leave the area. Summary LSA Created by ABR flooded into each area 4.

R1 is flooding a router LSA within the area so R2 will store this in its LSDB. The scope of this type of LSA is area-local. LSA Type 2 Network generated by DR lists all attached routers flooded.

Autonomous system LSA Created by ASBR flooded into OSPF domain Well the O only code is for routes inside of our own area. Further detail on these LSA types is shared below LSA Type 9. -All routers advertise their directly connected OSPF-enabled links in a type 1 LSA and forward their network information to OSPF neighbors.

Every OSPF router maintains a Link state database LSDB. These do not leave the area. Network LSA Generated by DR flooded within an area 3.

LSA TYPE 2 OSPF NETWORK LSA. LSA Type 1 Router LSA packets are sent between routers within the same area of origin and do not leave the area. LSA Type 1 Router LSA Generated by all routers in an area to describe their directly attached links Intra-area routes.

Therefore multiple LSAs are required. Please refer to the above diagram to understand the below better. I just enabled ospf globally and on the physical link on PE1.

OSPF LSA Types Explained 3. Created by the ABR and contain summary routes for networks in an area. The Link IDs of Type 2 LSA are the IP interface addresses of the DRs.

This LSA has types depend on the type of router and has also sequence number. LSA Type 2 Network LSA Generated by the DR of a broadcast or Nonbroadcast segment to describe the neighbors connected to the segment. Packet length is the total length of an OSPF packet.

This LSA types is Link-state in scope and is not flooded beyond the local network. Following is a list of OSFP LSA types and their relevance to appropriate OSPF areas. OSPF LSA Types with ExampleLSA Type 1 Router LSA Type 2 Network LSA Type 3 Network Summary LSA Type 4 ASBR Summary LSA Type 5 AS External LSA.

LSA Type 1 Router contains router links and state and is flooded into the area of origin. List out the different types of LSA. Each router stores the received LSA packets in the link-state database.

OSPF however works with multiple areas and you probably want full connectivity within all of the areas. Type 1 router LSAs always stay within the area. The format of the common OSPF header is shown below.

Au type is the authentication type. ASBR Summary LSA Created by ABR flooded into backbone 5. Figure -11 Different LSA Types is OSPF v2.

And they are injected in other areas. Today I will embark on explaining Type-3 4 and 5 with straight-forward examples. Link state advertisement It is a message that communicates the routers local routing topology to all other local routers in the same OSPF area.

-Type 1 LSAs are flooded only within the area in which they originated. This LSA contains external route information. OSPF uses LSA to create and maintain the network topology.

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