Avaya Configuring IP Services Manual de usuario Pagina 193

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Customizing OSPF Services
117356-A Rev. A 7-3
OSPF Addresses and Variable-Length Masks
A destination in as OSPF route advertisement is expressed as an IP address and a
variable-length mask. Taken together, the address and the mask indicate the range
of destinations to which the advertisement applies.
The ability to specify a range of networks allows OSPF to send one summary
advertisement that represents multiple destinations. For example, a summary
advertisement for the destination 128.185.0.0 with a mask of 0xffff0000 describes
a single route to destinations 128.185.0.0 to 128.185.255.255.
OSPF Neighbors
OSPF neighbors are any two routers that have an interface to the same network. In
each OSPF network, routers use the Hello protocol to discover their neighbors and
maintain neighbor relationships. On a broadcast or point-to-point network, the
Hello protocol dynamically discovers neighbors; however, on a nonbroadcast
multiaccess network, you must manually configure neighbors.
The Hello protocol ensures that communication between neighbors is
bidirectional. Periodically, OSPF routers send out hello packets over all interfaces.
Included in these hello packets are
The router’s priority
The router’s Hello Timer and Dead Timer values
A list of routers that have sent this router hello packets on this interface
The router’s choice for designated router and backup designated router
Bidirectional communication is determined when one router sees itself listed in
the neighbor’s hello packet.
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