TP-Link JetStream T2700G-28TQ User Manual page 200

Type Authentication
Code
Name
0 Non-Authentication
1 Plain-text
Authentication
2 MD5 Ciphertext
Authentication
2. HELLO Packet
OSPF routers send Hello packets to each other to find neighbor routers in the network and to
maintain the mutual adjacency relationship. Only when two routers send Hello packets carrying
the same interface parameters, can they become neighbors.
1) Netmask: Netmask of the router interface forwarding Hello packet. Only when the netmask of
the forwarding interface and that of the receiving interface coincide, can these two routers be
neighbors.
2) Hello Interval: Interval of a sequence of Hello packets sending by the forwarding interface.
Only the routers with the same Hello interval can become neighbors.
Router Priority: This field decides the election result for DR/BDR in the network segment.
3)
The greatest value means the highest priority of the advertising router and also the possibility
of being elected as the DR in the segment, while the value 0 means no election right.
Features
The 64-bit authentication information fields behind
are all 0.
The 64-bit authentication information behind is the
password to authenticate.
The Key ID, authentication data length and
encryption serial number work together to perform
MD5 Ciphertext Authentication
Table 10-4 Authentication Type
Figure 10-40 HELLO Packet
188