How Can Faster OSPF Convergence Be Achieved?

Created Apr 20, 2017 08:42:03Latest reply Apr 20, 2017 14:06:23 951 1 0 0
How Can Faster OSPF Convergence Be Achieved?
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Adamcolob     Created Apr 20, 2017 14:06:23 Helpful(0) Helpful(0)

OSPF convergence speed is affected by the following factors:

A router detects that the peer link is down and the neighbor relationship becomes invalid;
A new link-state advertisement (LSA) is generated and flooded;
The Link State Database (LSDB) is updated. A new route is calculated through the Shortest Path First (SPF) routing algorithm and delivered to the Forwarding Information Base (FIB) table.
For faster OSPF convergence, you can adjust the following options on the router:

Shorten the hello interval and dead interval of the neighbor, or configure Bidirectional Forwarding Detection (BFD) for fast failure detection;
Decrease the spf-schedule-interval (five seconds by default) to shorten the time interval between two SPF algorithm operations;
Shorten the LSA generation interval;
Shorten the interval of detecting LSA arrival;
On the interface, run the ospf trans-delay command to speed up the flooding of LSAs.
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