OSPF neighbor states
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml
Exchange
In the exchange state, OSPF routers exchange database descriptor (DBD) packets.
Database descriptors contain link-state advertisement (LSA) headers only and
describe the contents of the entire link-state database. Each DBD packet has a
sequence number which can be incremented only by master which is explicitly
acknowledged by slave. Routers also send link-state request packets and
link-state update packets (which contain the entire LSA) in this state. The
contents of the DBD received are compared to the information contained in the
routers link-state database to check if new or more current link-state
information is available with the neighbor.
Loading
In this state, the actual exchange of link state information occurs. Based on
the information provided by the DBDs, routers send link-state request packets.
The neighbor then provides the requested link-state information in link-state
update packets. During the adjacency, if a router receives an outdated or
missing LSA, it requests that LSA by sending a link-state request packet. All
link-state update packets are acknowledged.
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of Taqdir Singh
Sent: Wednesday, October 20, 2010 8:55 AM
To: [email protected]
Subject: [OSL | CCIE_RS] OSPF - Exchange vs loading ?
Hi team:
how would you differentiate betwen ospf exchange vs loading ?
what excatly happens in exchange and loading ?
--
Thanks & regards,
Taqdir Singh
Networks | 9911709496
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