Why in ospf , lsa refresh time is set as 30 minutes

Hi all
i have doubt regarding the ospf lsa refresh time interval . why this is set as default by 30 minutes . is there any particular reason for this ? Please let me know

Hi,
RFC 2328 stipulates two facts:
The maximum age of an LSA is 3600 seconds. After an LSA has reached an age of 3600 seconds, it must be flushed.
Every LSA has to be reoriginated (that is, refreshed) every 1800 seconds.
The choice of 1800 seconds for the refresh interval is purely a very conservative estimate of the advance in which an LSA should be refreshed so that it can still be propagated to all other routers in an area or OSPF domain in time before the old LSA expires by reaching the age of 3600 seconds. In essence, the choice of the refresh interval at 30 minutes gives the network an additional 30 minutes to propagate the refreshed LSA before the old one expires.
In fact, current Cisco IOSes do not go by the exact 1800 second interval. The IOS has chosen various approaches to scheduling the LSA refreshing process, and it is very nicely described in this article by Petr Lapukhov:
http://blog.ine.com/2009/12/31/tuning-ospf-performance/
Scroll down to the part called LSA Group Pacing.
Best regards,
Peter

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Why in ospf , lsa refresh time is set as 30 minutes

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