area 0 authentication message-digest

[vasanth_k08]

>> area 0 authentication message-digest

does this command makes that md5 authentication mandatory for the rest of the network segments in area 0 or just for the network connected to that particular router?

[melletandre]

Hi,

It specify/enable all of area 0 to use MD5 autentication.

But you are still required to configure the authentication under the interfaces connected to Area 0 i.e.

router ospf 1
area 0 authentication message-digest

interface FastEthernet0/0

     ip ospf 1 area 0
     ip ospf message-digest-key 1 md5 cisco

[Sanjay Shaw]

Hi Kumar,

Area authentication command in the configuration enables authentication for all the interfaces of the particular area.

It means the network segments in Area 0.

BR//SS

[Rolf Fischer]

Hi,

the area authentication sets the default for all the local OSPF interfaces belonging to that area, but you can also disable/change authentication on a per-interface level if you want or need to:

R1#show ip ospf interface s0/0 | i auth
 Message digest authentication enabled
R1#conf term
R1(config)#int s0/0
R1(config-if)#ip ospf authentication null
*Mar  1 00:03:32.411: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0/0 from LOADING to FULL, Loading Done
R1(config-if)#do show ip ospf interface s0/0 | i auth
R1(config-if)#

Best regards

Rolf