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Zorluk: OrtaOSPFv2 Network Types and DR/BDR Selection

Match each OSPFv2 network type or interface configuration on the left to its corresponding DR/BDR election requirement and default timer profile on the right.

  • BroadcastElects a DR and BDR; defaults to 10-second Hello and 40-second Dead timers.
  • Point-to-PointSuppresses DR/BDR election; defaults to 10-second Hello and 40-second Dead timers.
  • Point-to-MultipointSuppresses DR/BDR election; defaults to 30-second Hello and 120-second Dead timers.
  • OSPF Interface Priority set to 0Explicitly prevents a router interface from becoming a DR or BDR on multiaccess segments.

Cevap

Broadcast pairs with DR/BDR election and 10s/40s timers; Point-to-Point pairs with no DR/BDR election and 10s/40s timers; Point-to-Multipoint pairs with no DR/BDR election and 30s/120s timers; Priority 0 explicitly excludes the interface from DR/BDR election.
Broadcast network types perform DR/BDR elections with 10s/40s timers to minimize link-state information flooding across shared multiaccess media. Point-to-Point network types suppress DR/BDR elections since only two endpoints exist, using 10s/40s timers. Point-to-Multipoint network types also suppress DR/BDR elections but use 30s/120s timers suitable for WAN connections. Configuring an OSPF priority of 0 explicitly forces the interface to act strictly as a DROther, avoiding DR or BDR role assignment.

Adım Adım Çözüm

1
Identify network types that perform DR/BDR elections
Only Broadcast (and Non-Broadcast Multiaccess / NBMA) network types conduct DR/BDR elections.
Multiaccess segments require a central router (DR) to reduce adjacency overhead from n(n-1)/2 to n-1.
2
Differentiate default Hello and Dead timers among non-DR network types
Point-to-Point uses 10s Hello / 40s Dead timers, whereas Point-to-Multipoint uses 30s Hello / 120s Dead timers.
Point-to-Multipoint is designed for hub-and-spoke topologies where slower timers account for WAN link characteristics.
3
Determine the impact of setting interface priority to 0
An OSPF priority of 0 disqualifies the interface from becoming DR or BDR.
The priority range is 0-255, where 0 explicitly excludes the router from election, keeping it as a DROther regardless of Router ID.

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OSPFv2 Network Types and DR/BDR Selection Rules
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OSPFv2 Network Types and DR/BDR Selection

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