13 good questions and answers about "OSPF - Foundation Summary"

What is the command mode and description of ipv6 router ospf process id?
Global config; puts user in IPv6 OSPFv3 configuration mode for that PID.
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What is the command mode and description of area area-id default-cost cost?
OSPF config mode; sets the cost of the default route created by ABRs and sent into stubby areas.
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What is the command mode and description of ospfv3 [ process-id [ ipv4 | ipv6 ] ] cost interface-cost?
Interface subcommand; sets the cost.
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What is the command mode and description of ip(v6) ospf mtu-ignore?

Interface subcommand; tells the router to ignore the check for equal MTUs that occurs when sending DD packets.
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What is the command mode and description of ip(V6) ospf retransmit-interval seconds?
Interface subcommand; sets the time between LSA transmissions for adjacencies belonging to an interface. The default is 5 seconds.
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What is the command mode and description of show { ip ospf | ipv6 ospf | ospfv3 }[ process-id ] summary-address?
User mode; lists information about route summaries in OSPF.
Router# show ip ospf summary-address OSPF Process 2, Summary-address 10.2.0.0/255.255.0.0 Metric -1, Type 0, Tag 0 10.2.0.0/255.255.0.0 Metric -1, Type 0, Tag 10
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What is the command mode and description of show { ip ospf | ipv6 ospf | ospfv3 } interface [ interface-type interface-number ] [ brief ]?

User mode; lists OSPF protocol timers and statistics per interface.


R1# sh ip ospf interface brief
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Lo1          1     0               1.1.1.1/24         1     LOOP  0/0
Gi0/0        1     0               192.168.1.1/24     1     BDR   1/1
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What is the command mode and description of show { ip ospf | ipv6 ospf | ospfv3 } statistics [ detail ]?
User mode; displays OSPF SPF calculation statistics.


show ip ospf statistics

OSPF Router with ID (2.2.2.2) (Process ID 1)

  Area 0: SPF algorithm executed 12 times

  Summary OSPF SPF statistic

  SPF calculation time
Delta T   Intra D-Intra Summ    D-Summ  Ext     D-Ext   Total   Reason
03:37:23   0    4       0       0       0       0       4       R, N
03:35:54   0    4       0       0       0       0       4       R, N
01:52:30   0    0       0       0       0       0       0       R
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What is the meaning of the OSPF timer Retransmission?

Per interface; the time between sending an LSU, not receiving an
acknowledgment, and then resending the LSU. Default is 5 seconds.
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What is the meaning of the OSPF timer Poll Interval?

On NBMA networks, the period at which Hellos are sent to a neighbor
when the neighbor is down. Default is 60 seconds.
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What is the range for single interface cost?
1 to 65,535 (2^16-1)
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What is the range for complete route cost? And what is the infinite cost?
1 to 16,777,215 (2^24-1)

Infinite cost  16,777,215 (2^24-1)
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What is the range for a LSA age?
1 to 3600 seconds
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