Explorer OSPF Packets

Sunday, April 5, 2009

Explorer OSPF Packets
OSPF Packets:

OSPFv3 has five types of packets: hello, DD, LSR, LSU, and LSAck.

OSPF does not use UDP or TCP for transmitting its packets. Instead, it runs directly over IP (IP protocol 89) using an OSPF header. One field in this header identifies the type of packet being carried.

Hello—Identifies neighbors and serves as a keepalive and to elect the DR/BDR,

Database Description (DBD)—A summary of the LSDB, including the RID and sequence number of each LSA in the LSDB for database synchronization, contents in DD packets including the header of each LSA (uniquely representing a LSA). The LSA header occupies small part of an LSA to reduce traffic between routers. The recipient checks whether the LSA is available using the LSA header.

Link State Request (LSR)—A request for an Link State Update (LSU). Contains the type of LSU requested and the ID of the router requesting it.

Link State Update (LSU)—LSU (Link State Update) packets are used to send the requested LSAs to peers, and each packet carries a collection of LSAs

Link State Acknowledgment (LSAck)—Acknowledges all other OSPF packets (except hellos).

OSPF traffic is multicast to either of two addresses: for all OSPF routers or for all OSPF DRs


Use The Below Code To Use Emoticons In your Comments

:)) ;)) ;;) :D ;) :p :(( :) :( :X =(( :-o :-/ :-* :| 8-} :)] ~x( :-t b-( :-L x( =))

Post a Comment

Related Posts with Thumbnails