Brocade Multi-Service IronWare Routing Configuration Guide Manual de usuario descargar pdf (Pagina 187)

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Multi-Service IronWare Routing Configuration Guide 159

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OSPF point-to-point links

Designated router election in multi-access networks

In a network with no designated router and no backup designated router, the neighboring router

with the highest priority is elected as the DR, and the router with the next largest priority is elected

as the BDR, as shown in Figure 9

FIGURE 9 Designated and backup router election

If the DR goes off-line, the BDR automatically becomes the DR. The router with the next highest

priority becomes the new BDR. This process is shown in Figure 10.

NOTE

Priority is a configurable option at the interface level. You can use this parameter to help bias one

router as the DR.

FIGURE 10 Backup designated router becomes designated router

If two neighbors share the same priority, the router with the highest router ID is designated as the

DR. The router with the next highest router ID is designated as the BDR.

NOTE

By default, the Brocade device’s router ID is the IP address configured on the lowest numbered

loopback interface. If the device does not have a loopback interface, the default router ID is the

lowest numbered IP address configured on the device.

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Brocade Multi-Service IronWare Routing Configuration Guide Manual de usuario Pagina 187

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