sh ip protocol
Router#sh ip pro
Routing Protocol is "ospf 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 1.1.1.1
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
1.1.0.0 0.0.255.255 area 100
10.0.0.0 0.255.255.255 area 100
Reference bandwidth unit is 100 mbps
Routing Information Sources:
Gateway Distance Last Update
2.2.2.2 110 00:00:19
Distance: (default is 110)
sh ip ospf or sh ip ospf process ID --->shows how many times SPF has been calculated. More the number lesser the stability of the network.
Router#sh ip ospf
Routing Process "ospf 100" with ID 1.1.1.1
Start time: 00:01:25.328, Time elapsed: 00:41:49.764
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 100
Number of interfaces in this area is 2 (1 loopback)
Area has no authentication
SPF algorithm last executed 00:01:20.384 ago
SPF algorithm executed 4 times
Area ranges are
Number of LSA 3. Checksum Sum 0x01587C
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
sh ip ospf database --> shows number of connected neighbors discovered by hello packets
Router#sh ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 100)
Router Link States (Area 100)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 169 0x80000004 0x0025C1 2
2.2.2.2 2.2.2.2 168 0x80000003 0x003B9F 2
Net Link States (Area 100)
Link ID ADV Router Age Seq# Checksum
10.10.1.1 1.1.1.1 169 0x80000001 0x00F71C
sh ip ospf interface--->
Router#sh ip ospf interface f0/0
FastEthernet0/0 is up, line protocol is up --->state of the link
Internet Address 10.10.1.1/24, Area 100 --->interface IP and area in which the interface is
Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1----> cost of the link
Transmit Delay is 1 sec, State DR, Priority 1 -->TD is amount of time taken in sending update to the neighbor, state is DR,BDR,Waiting,DROther. Priority is another parameter in hello packet of OPSF
Designated Router (ID) 1.1.1.1, Interface address 10.10.1.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5--->shows hello packet varialbles
oob-resync timeout 40
Hello due in 00:00:02
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Sh ip ospf neigh
Router#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/BDR 00:00:33 10.10.1.2 FastEthernet0/0
it shows about neighbor states and physical interface with which the neigbor is connected
Router#sh ip ospf neighbor 2.2.2.2
Neighbor 2.2.2.2, interface address 10.10.1.2
In the area 100 via interface FastEthernet0/0
Neighbor priority is 1, State is FULL, 6 state changes -----> INIT, 2 WAY, EXSTART, EXCHANGE, LOADING, FULL,DOWN,ATTEMPT
DR is 10.10.1.1 BDR is 10.10.1.2
Options is 0x52
LLS Options is 0x1 (LR)
Dead timer due in 00:00:35
Neighbor is up for 00:12:22
Index 1/1, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
Router#sh ip pro
Routing Protocol is "ospf 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 1.1.1.1
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
1.1.0.0 0.0.255.255 area 100
10.0.0.0 0.255.255.255 area 100
Reference bandwidth unit is 100 mbps
Routing Information Sources:
Gateway Distance Last Update
2.2.2.2 110 00:00:19
Distance: (default is 110)
sh ip ospf or sh ip ospf process ID --->shows how many times SPF has been calculated. More the number lesser the stability of the network.
Router#sh ip ospf
Routing Process "ospf 100" with ID 1.1.1.1
Start time: 00:01:25.328, Time elapsed: 00:41:49.764
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 0. Checksum Sum 0x000000
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 100
Number of interfaces in this area is 2 (1 loopback)
Area has no authentication
SPF algorithm last executed 00:01:20.384 ago
SPF algorithm executed 4 times
Area ranges are
Number of LSA 3. Checksum Sum 0x01587C
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
sh ip ospf database --> shows number of connected neighbors discovered by hello packets
Router#sh ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 100)
Router Link States (Area 100)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 169 0x80000004 0x0025C1 2
2.2.2.2 2.2.2.2 168 0x80000003 0x003B9F 2
Net Link States (Area 100)
Link ID ADV Router Age Seq# Checksum
10.10.1.1 1.1.1.1 169 0x80000001 0x00F71C
sh ip ospf interface--->
Router#sh ip ospf interface f0/0
FastEthernet0/0 is up, line protocol is up --->state of the link
Internet Address 10.10.1.1/24, Area 100 --->interface IP and area in which the interface is
Process ID 100, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1----> cost of the link
Transmit Delay is 1 sec, State DR, Priority 1 -->TD is amount of time taken in sending update to the neighbor, state is DR,BDR,Waiting,DROther. Priority is another parameter in hello packet of OPSF
Designated Router (ID) 1.1.1.1, Interface address 10.10.1.1
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5--->shows hello packet varialbles
oob-resync timeout 40
Hello due in 00:00:02
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Sh ip ospf neigh
Router#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/BDR 00:00:33 10.10.1.2 FastEthernet0/0
it shows about neighbor states and physical interface with which the neigbor is connected
Router#sh ip ospf neighbor 2.2.2.2
Neighbor 2.2.2.2, interface address 10.10.1.2
In the area 100 via interface FastEthernet0/0
Neighbor priority is 1, State is FULL, 6 state changes -----> INIT, 2 WAY, EXSTART, EXCHANGE, LOADING, FULL,DOWN,ATTEMPT
DR is 10.10.1.1 BDR is 10.10.1.2
Options is 0x52
LLS Options is 0x1 (LR)
Dead timer due in 00:00:35
Neighbor is up for 00:12:22
Index 1/1, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
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