Hi Team,
i was doing a LAB today about OSPF topology is given below
Here i have 3 routers on multi-access network so i created 3 loopback on R1 and advertised them under OSPF. so now the thing is i am able to see all loopbacks under routing table of each router but not seeing them in LSDB can you explain why,
R1
R1#show ip ospf interface
Loopback2 is up, line protocol is up
Internet Address 1.1.1.1/32, Area 0
Process ID 1, Router ID 192.168.20.1, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Loopback3 is up, line protocol is up
Internet Address 2.2.2.1/24, Area 0
Process ID 1, Router ID 192.168.20.1, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Loopback100 is up, line protocol is up
Internet Address 100.100.100.1/24, Area 0
Process ID 1, Router ID 192.168.20.1, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
FastEthernet0/0 is up, line protocol is up
Internet Address 192.168.20.1/24, Area 0
Process ID 1, Router ID 192.168.20.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 192.168.20.2, Interface address 192.168.20.2
Backup Designated router (ID) 192.168.20.1, Interface address 192.168.20.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 192.168.20.2 (Designated Router)
Suppress hello for 0 neighbor(s)
R1#sh ip ospf database
OSPF Router with ID (192.168.20.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
192.168.10.1 192.168.10.1 932 0x80000002 0x00213E 1
192.168.20.1 192.168.20.1 1450 0x80000011 0x00704B 4
192.168.20.2 192.168.20.2 931 0x8000000B 0x0063CC 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.10.2 192.168.20.2 931 0x80000001 0x00DA76
192.168.20.2 192.168.20.2 1251 0x80000002 0x00EC4F
not seeing any loopback in LSDB
but on R3 i am seeing them under routing table.
R3
R3#show ip ospf database
OSPF Router with ID (192.168.10.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
192.168.10.1 192.168.10.1 211 0x80000002 0x00213E 1
192.168.20.1 192.168.20.1 733 0x80000011 0x00704B 4
192.168.20.2 192.168.20.2 212 0x8000000B 0x0063CC 2
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.10.2 192.168.20.2 212 0x80000001 0x00DA76
192.168.20.2 192.168.20.2 532 0x80000002 0x00EC4F
route
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/3] via 192.168.10.2, 00:16:23, FastEthernet0/1
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.1 [110/3] via 192.168.10.2, 00:16:23, FastEthernet0/1
100.0.0.0/32 is subnetted, 1 subnets
O 100.100.100.1 [110/3] via 192.168.10.2, 00:16:23, FastEthernet0/1
C 192.168.10.0/24 is directly connected, FastEthernet0/1
O 192.168.20.0/24 [110/2] via 192.168.10.2, 00:16:23, FastEthernet0/1