![]() This feature is intended to minimize traffic created by a periodic refresh of LSAs in OSPF domains with large number of LSAs. 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.Ĭisco IOS version 12.1(2)T introduces the flooding reduction feature for OSPF. Using OSPF demand circuit options suppresses hello and LSA refresh functions. However, even this amount of traffic is undesirable on demand circuits. These functions maintain neighbor relationships and ensure that the link-state databases are accurate and use far less bandwidth than similar functions in Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP). OSPF sends hellos every 10 seconds and refreshes its link-state advertisements (LSAs) every 30 minutes. Demand circuit options were introduced for Open Shortest Path First (OSPF) in Cisco IOS ® Software release 11.2 in response to the OSPF RFC 1793. ![]()
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