Brocade Multi-Service IronWare Routing Configuration Guide Instrukcja Użytkownika Pobierz pdf (Strona 186)

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OSPF point-to-point links

FIGURE 8 OSPF operating in a network

OSPF point-to-point links

In an OSPF point-to-point network, where a direct Layer 3 connection exists between a single pair of

OSPF routers, there is no need for Designated and Backup Designated Routers, as is the case in

OSPF multi-access networks. Without the need for Designated and Backup Designated routers, a

point-to-point network establishes adjacency and converges faster. The neighboring routers

become adjacent whenever they can communicate directly. In contrast, in broadcast and

non-broadcast multi-access (NBMA) networks, the Designated Router and Backup Designated

Router become adjacent to all other routers attached to the network.

To configure an OSPF point-to-point link, refer to “Configuring an OSPF network type” on page 209.

Designated routers in multi-access networks

In a network that has multiple routers attached, OSPF elects one router to serve as the designated

router (DR) and another router on the segment to act as the backup designated router (BDR). This

arrangement minimizes the amount of repetitive information that is forwarded on the network by

forwarding all messages to the designated router and backup designated routers responsible for

forwarding the updates throughout the network.

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