OSPF: Difference between revisions
→Demand Circuit vs Flood Reduction
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*OSPF sends hellos every 10 seconds and refreshes its LSAs every 30 minutes.
*These functions maintain neighbor relationships and ensure that the link-state databases are accurate and use far less bandwidth than similar functions in RIP & IGRP.
*However, even this amount of traffic is undesirable on demand circuits
*Using OSPF demand circuit options suppresses hello and LSA refresh functions.
*OSPF can establish a demand link to form an adjacency and perform initial database synchronization, the adjacency remains active even after Layer 2 of the demand circuit goes down.
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