1.) It is 32-bit number assigned to each router running the ospf protocol.
2.) It is uniquely identify of the router within an autonomous number.
3.) It elects based on highest loopback ip address of router, otherwise highest non-loopback
ip address of router.
4.) We can set manually ospf router id:
In ospf router subcommand: router-id <router-id>
IP protocol type 89 (Does not use TCP and UDP)
OSPF need to perform reliable multicasting because it need talk to multiple possible neighbor
on the same network segment. Now, TCP does not support multicasting and UDP is reliable
not. Therefore, OSPF implements its own transport mechanism that allows both for reliability
(acknowledgments and retransmission of lost segments) and multicasting, bypassing both TCP
Based on cost of all outgoing interfaces in a route.
3.) Hello interval
Interval which route sends OSPF hello messages out of an interface. By default OSPF send hello
messages in every 10 second on ethernet link and 30 second on WAN link.
Note : OSPF send fast hello messages less than 1 second.
Follow this link:
4.) Dead - Timer
Timer used to determine when neighbor router has failed. OSPF router send dead message every
5.) Update Destination address
Normally send to 220.127.116.11 (all SPF router) and 18.104.22.168 (all DR) router.
6.) Full or Partial update
Full update used when new neighbor are discovered. Partial update used otherwise.
Support MD-5 and Clear-text authentication.
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