BigIron RX Series Configuration Guide 681
53-1002253-01
Overview of OSPF (Open Shortest Path First)
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FIGURE 102 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 103.
Priority is a configurable option at the interface level. You can use this parameter to help bias one
router as the DR.
FIGURE 103 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.
Router A
Router B
Router C
priority 10
priority 20
priority 5
Designated Backup Router
Designated Router
Router C
priority 5
Router B
priority 20
Designated Router
priority 10
Router A
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