OSPF - Foundation Summary
13 important questions on OSPF - Foundation Summary
What is the command mode and description of ipv6 router ospf process id?
What is the command mode and description of area area-id default-cost cost?
What is the command mode and description of ospfv3 [ process-id [ ipv4 | ipv6 ] ] cost interface-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.
What is the command mode and description of ip(V6) ospf retransmit-interval seconds?
What is the command mode and description of show { ip ospf | ipv6 ospf | ospfv3 }[ process-id ] summary-address?
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
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
What is the command mode and description of show { ip ospf | ipv6 ospf | ospfv3 } statistics [ detail ]?
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
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.
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.
What is the range for single interface cost?
What is the range for complete route cost? And what is the infinite cost?
Infinite cost 16,777,215 (2^24-1)
What is the range for a LSA age?
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