Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 36)

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Configuring IP, ARP, RIP, and OSPF Services

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Designated Routers

To further reduce the amount of routing traffic, the Hello protocol elects a

designated router and a backup designated router on each multiaccess network.

Instead of neighboring routers forming adjacencies and swapping link-state

information with each other (which on a large network can mean a lot of routing

protocol traffic), all routers on the network form adjacencies with the designated

router and the backup designated router only and send link-state information to

them. The designated router then distributes the information from each router to

every other router.

The Hello protocol always elects a backup designated router along with the

designated router. This router takes over all of the designated router’s functions

should the designated router fail.

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