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39 Cards in this Set
- Front
- Back
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OSPF Neighbor Relationships Certain parameters within the OSPF Hellos must also match for two routersto become neighbors. They include |
■ Hello/dead timers■ Area ID■ Authentication type and password■ Stub area flag |
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OSPF Neighbor Relationships
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OSPF routers send out periodic multicast packets to introduce themselves toother routers on a link. They become neighbors when they see their ownrouter ID included in the Neighbor field of the Hello from another router.Seeing this tells each router that they have bidirectional communication. Inaddition, two routers must be on a common subnet for a neighbor relationshipto be formed. (Virtual links are sometimes an exception to this rule.) |
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IPv4 multicast addresses used for OSPF are 224.0.0.5 tosend information to all OSPF routers
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224.0.0.6 to send information to DR/BDR routers.
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IPv6 multicast addresses are FF02::5 for all OSPFv3 routers
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FF02::6for all DR/BDR routers
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OSPF uses multicast and unicast, rather than broadcast,for sending messages
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Authentication: OSPF supports clear-text, MD5, and SHA authentication
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Independent transport: OSPF works on top of IP and uses protocol number 89. Itdoes not rely on the functions of the transport layer protocols TCP or UDP
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