In this video you will learn about the OSPF type-4 summary ASBR LSA. We will examine why we need this LSA and look at a scenario on real cisco equipment to demonstrate the type 4 LSA
Nicely done, best part is that the practical, theory and the immediate effect of a commands shown together....Sir post a video explaing all the LSA on practical.
@starguard: Link-State Advertisement. Essentially it is an advertisement containing the relevant link and state information needed for OSPF routers to build a topology database which they then use to build their routing table
You know how Cisco likes to make proprietary protocols like EIGRP easier and more flexible to work with? I wish they could do the same thing with OSPF.
Ok I understand , that we know how to get to 4.4.4.4 .. But if we advertise the loopback 4.4.4.4 into ospf,, it wud be reflected in all areas.. wudnt it??
4.4.4.4 Network is different from the Actual 4.4.4.4 R4's RID. Pay attention to what a Link State Identifier is refering to : In LSA Type 3 ==> The actual Network/prefix 4.4.4.4 == R4 Loopback In LSA Type 4 ==> A Router ID 4.4.4.4 == R4's RID ( It could be 44.44.44.44) Make sense?
R2 should be having a type 3 lsa with a metric to reach the ASBR via ABR. I don't think R2 even needs a type 4 LSA in this case as it already has Type 3 lsa regarding the ASBR advertised by ABR into area 25. You are thus correct.
@@parassinghpardeshi872 correct, I was about to ask the same thing that LSA 4 is not required for this as LSA 3 should advertise inter area route. LSA 4 is only for NSSA
@@shaheershaikh I don't think type 4 lsa is not needed. Consider a case if router 4.4.4.4 is not an actual loop back it's just a router id to identify that router in the tree. In that case if 4.4.4.4 has not been advertised in ospf or any other routing domain then we need type 4 LSA to reach 4.4.4.4. By default if you make a loop back interface it's added in the routing table and is considered as a directly connected interface. And it's been advertised in ospf here so it's generating type 3 lsa for it. If 4.4.4.4 had not been advertised in ospf in any case it's just an ID which none of the routers know, thus it's mandatory that type 4 lsa is there to reach it. That's what I think, I maybe wrong. 😇
@@shaheershaikh Brother I didn't expect you would reply 😂 I felt how old ospf really is when I commented here. I'm just getting started into networking field 😇
Thank you very much! I was confused on why I couldn't see any Type 4 LSA's. Very well explained.
Thank you! Kevin Wallace video confused me, yours cleared what I thought was the correct explanation of LSA type 4
This is the best LSA Type 4 explanation.
Nicely done, best part is that the practical, theory and the immediate effect of a commands shown together....Sir post a video explaing all the LSA on practical.
Thank you very much for this video. This really helped me understand the difference between Type 4 and Type 5 LSAs. Nice work!
Clear and simple explanation. Thanks!
Excellent, Short and Clear, Thank You
thank you very much , now I know why type 4 are not in my ospf database !
Detailed Explanation. Thanks for this video.
Thank you for this short and clear explanation of Type 4 LSA.
Next time you post a video, add the links to your blog and tweeter ;)
Excellent, you explain very well. Keep it up!
Great explanation, thanks!
Nice video. Thank you for your explanation.
Very well explained why LSA-4 and its requirement... Thank you.
Thank you for the awesome video!!! :)
Great explanation, thanks for sharing your knowledge
jus loved d xplanation n hav
made my doubts very clear.....thnxxxxxxxx
good video ,very detail
@starguard: Link-State Advertisement. Essentially it is an advertisement containing the relevant link and state information needed for OSPF routers to build a topology database which they then use to build their routing table
What kind of device is that Cat3? i cant find it in Packet Tracer.
can you explain all OSPF LSA TYPES
You know how Cisco likes to make proprietary protocols like EIGRP easier and more flexible to work with? I wish they could do the same thing with OSPF.
Ok I understand , that we know how to get to 4.4.4.4 .. But if we advertise the loopback 4.4.4.4 into ospf,, it wud be reflected in all areas.. wudnt it??
4.4.4.4 Network is different from the Actual 4.4.4.4 R4's RID.
Pay attention to what a Link State Identifier is refering to :
In LSA Type 3 ==> The actual Network/prefix 4.4.4.4 == R4 Loopback
In LSA Type 4 ==> A Router ID 4.4.4.4 == R4's RID ( It could be 44.44.44.44)
Make sense?
Link State Advertisements
wudnt R2 have a type 3 LSA of 4.4.4.4? If R2 had it in the first set up,, it means 4.4.4.4 has been advertised in ospf.. Correct me if I am wrong..
R2 should be having a type 3 lsa with a metric to reach the ASBR via ABR. I don't think R2 even needs a type 4 LSA in this case as it already has Type 3 lsa regarding the ASBR advertised by ABR into area 25. You are thus correct.
@@parassinghpardeshi872 Wahhh that was 7 years ago...thanks anyways though 😊
@@parassinghpardeshi872 correct, I was about to ask the same thing that LSA 4 is not required for this as LSA 3 should advertise inter area route. LSA 4 is only for NSSA
@@shaheershaikh I don't think type 4 lsa is not needed. Consider a case if router 4.4.4.4 is not an actual loop back it's just a router id to identify that router in the tree. In that case if 4.4.4.4 has not been advertised in ospf or any other routing domain then we need type 4 LSA to reach 4.4.4.4. By default if you make a loop back interface it's added in the routing table and is considered as a directly connected interface. And it's been advertised in ospf here so it's generating type 3 lsa for it. If 4.4.4.4 had not been advertised in ospf in any case it's just an ID which none of the routers know, thus it's mandatory that type 4 lsa is there to reach it. That's what I think, I maybe wrong. 😇
@@shaheershaikh Brother I didn't expect you would reply 😂 I felt how old ospf really is when I commented here. I'm just getting started into networking field 😇
Link state advertisement
Bad quality video