Configure Simple Password Authentication

Language:

Configure simple password authentication in SEFOS2.
1. Type.
```
SEFOS# configure terminal
SEFOS(config)# router ospf
SEFOS(config-router)# router-id 10.4.0.2
```
2. Enable OSPF over the VLAN interface and associate the interface with an OSPF area.
```
SEFOS(config-router)# network 10.4.0.2 area 0.0.0.0
```
3. Exit Router Configuration mode.
```
SEFOS(config-router)# exit
```
4. Enter Interface Configuration mode.
```
SEFOS(config)# interface vlan 1
```
5. Configure the authentication key for simple password authentication.
```
SEFOS(config-if)# ip ospf authentication-key 1234
```
6. Enable simple password authentication.
```
SEFOS(config-if)# ip ospf authentication
```
7. Exit Interface Configuration mode.
```
SEFOS(config-if)# exit
```
8. Exit Configuration mode.
```
SEFOS(config)# exit
```

Configure simple password authentication in SEFOS4.
1. Type.
```
SEFOS# configure terminal
SEFOS(config)# router ospf
SEFOS(config-router)# router-id 10.4.0.4
```
2. Enable OSPF over the VLAN interface and associate the interface with an OSPF area.
```
SEFOS(config-router)# network 10.4.0.4 area 0.0.0.0
```
3. Exit Router Configuration mode.
```
SEFOS(config-router)# exit
```
4. Enter Interface Configuration mode.
```
SEFOS(config)# interface vlan 1
```
5. Configure the authentication key for simple password authentication.
```
SEFOS(config-if)# ip ospf authentication-key 1234
```
6. Enable simple password authentication.
```
SEFOS(config-if)# ip ospf authentication
```
7. Exit Interface Configuration mode.
```
SEFOS(config-if)# exit
```
8. Exit Configuration mode.
```
SEFOS(config)# exit
```

Examine the authentication type configured.

SEFOS# show ip ospf interface
 
vlan1 is line protocol is up
Internet Address 10.4.0.2, Mask 255.255.0.0, Area 0.0.0.0
AS 1, Router ID 10.4.0.2, Network Type BROADCAST, Cost 1
Transmit Delay is 1 sec, State 5, Priority 1
Designated RouterId 10.4.0.4, Interface address 10.4.0.4
Backup Designated RouterId 10.4.0.2, Interface address 10.4.0.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 0 sec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with the neighbor 10.4.0.4
Simple password authentication enabled

Examine the adjacency formed between the neighbors in SEFOS 2 and SEFOS 4.

SEFOS# show ip ospf neighbor detail
 
Neighbor 10.4.0.4, interface address 10.4.0.4
In the area 0.0.0.0 via interface vlan1
Neighbor priority is 1,  State is FULL/BACKUP, 5 state changes
DR is 10.4.0.4 BDR is 10.4.0.2
Options is 0x2

Remove a previously assigned OSPF password.

SEFOS(config-if)# no ip ospf authentication-key