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Zorluk: KolayOSPFv2 Network Types and DR/BDR Selection

Refer to the following Cisco IOS command output executed on router R1:

text
R1# show ip ospf interface GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
Internet Address 192.168.1.1/24, Area 0
Process ID 1, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 3.3.3.3, Interface address 192.168.1.3
Backup Designated router (ID) 2.2.2.2, Interface address 192.168.1.2

If the Designated Router (3.3.3.3) fails, which role will router R1 assume on this multiaccess network segment?

  1. It will remain in the DROTHER state and will not participate in the election.Cevap
  2. B
    It will immediately become the Designated Router because it has an active neighbor relationship.
  3. C
    It will become the Backup Designated Router while the current BDR (2.2.2.2) promotes to Designated Router.
  4. D
    It will initiate a new election tie-breaker based on its Router ID.

Cevap

Router R1 will remain in the DROTHER state and cannot become the DR or BDR because its interface priority is set to 0.
In OSPFv2 broadcast network types, setting an interface's OSPF priority to 0 disables DR/BDR election eligibility for that interface. Even if the current DR or BDR fails, the router remains in the DROTHER state.

Adım Adım Çözüm

1
Examine the interface command output for R1's OSPF priority value.
The output displays 'Priority 0' and 'State DROTHER' for interface GigabitEthernet0/0.
An OSPF interface priority value of 0 explicitly designates the interface as ineligible for DR/BDR election.
2
Evaluate the effect of DR failure on a router with priority 0.
The existing Backup Designated Router (2.2.2.2) promotes to DR, but R1 remains DROTHER because its priority of 0 prevents election qualification.
Routers configured with priority 0 are permanently excluded from DR and BDR roles on broadcast networks.

Anahtar Kavram

OSPF Interface Priority 0 DR/BDR Exclusion
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OSPFv2 Network Types and DR/BDR Selection

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