See the following figure.

[: HCIP-Datacom-Core Technology Training Material (IS-IS DIS Election)​​., Analyzing the LSDB:, From the LSDB of R1, the Level-2 link-state database includes the following entries:, LSPID 0100.0000.3003.00-00: This is R3, and it is present in the Level-2 LSDB with the sequence number and checksum details., Other routers (R1, R2, R4) are present but do not have the characteristics of the Level-2 DIS in this topology., Based on the System IDs, R3 (0100.0000.3003) has the highest System ID, making it the Level-2 DIS., Conclusion:, The Level-2 DIS on the network is R3, based on the election rules and the LSDB information shown in the figure., ]