![]() OSPF does not define a way to fragment its protocol packets, and depends on IP fragmentation when transmitting packets larger than the network MTU. ![]() OSPF packets are therefore encapsulated solely by IP and local data-link headers. OSPF runs directly over the Internet Protocol's network layer. Appendix A.1 of RFC 2328 describes the Encapsulation of OSPF packets in this manner: Request for Comments (RFC) 2328 documents version 2 of the OSPF protocol. ![]() Outgoing packets, such as OSPF packets, cannot be larger than the interface MTU. This document describes the interaction of Open Shortest Path First (OSPF) packets, maximum transition unit (MTU), Link State Advertisements (LSAs), and Link State (LS) Update packets in the context of Cisco bug ID CSCse01519.
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