Which OSPF database packet determines which router is in charge of the database synchronization and the transferring of LSA headers between the two systems?
For the link state routing protocols, it is essential that the link state database for all the routers remain synchronized. This synchronization will begin as soon as an adjacency formed between the neighbors. OSPF uses DBD - database descriptor packets for that purpose.
The Database Description (DD) packets serve two main purposes:
1. determining which router is in charge of the database synchronization
2. transferring the LSA headers between the two systems
The Database Description (DBD) OSPF packet is used during the adjacency formation process to describe the contents of the topological database between routers. The routers exchange DBD packets to determine the master and slave relationship, which dictates the router in charge of the database synchronization.
References: OSPF Design Guide, Juniper Networks Documentation
OSPF Database Description Packets, Juniper Networks Documentation
the Database Description (DD) packets serve two main purposes:
1. determinining which router is in charge of the database synchronization
2. tansferring the LSA headers between the two systems
https://ipwithease.com/ospf-packet-types/
At the time of adjacency is being initialized, these packets are exchanged. These packets describe topological database contents. The database may be described by using multiple packets. A poll-response procedure is used for the description of multiple packets usage. Among the routers, one is designated to be master, and the other a slave. The Database Description packets are sent by the slave after sending the Database Description packets by the master.
Hello packet
When several systems or routers that run OSPF have interfaces attached to a common network, the Hello protocol determines the designated router (DR) .
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