H3C S9500 Series Operation Manual page 69

Operation Manual – OSPF
H3C S9500 Series Routing Switches
By default, the area does not support packet authentication.
II. Configuring OSPF packet authentication
OSPF supports simple authentication or MD5 authentication between neighboring
routers.
The authentication type configured on an interface takes effect only after the area to
which the interface belongs is configured with the corresponding authentication type.
Perform the following configuration in interface view to enable/disable OSPF packet
authentication:
Specify a password for OSPF simple
text authentication on the interface
Cancel simple authentication on the
interface
Specify the interface to use MD5
authentication
Disable the interface to use MD5
authentication
By default, the interface is not configured with either simple authentication or MD5
authentication.
1.3.20 Configuring OSPF Virtual Link
According to RFC2328, after the area partition of OSPF, not all the areas are equal. In
which, an area is different from all the other areas. Its Area-id is 0.0.0.0 and it is usually
called the backbone Area. The OSPF routes between non-backbone areas are
updated with the help of the backbone area. OSPF stipulates that all the non-backbone
areas should maintain the connectivity with the backbone area. That is, at least one
interface on the ABR should fall into the area 0.0.0.0. If an area does not have a direct
physical link with the backbone area 0.0.0.0, a virtual link must be created.
If the physical connectivity cannot be ensured due to the network topology restriction, a
virtual link can satisfy this requirement. The virtual link refers to a logic channel set up
through the area of a non-backbone internal route between two ABRs. Both ends of the
logic channel should be ABRs and the connection can take effect only when both ends
are configured. The virtual link is identified by the ID of the remote router. The area,
which provides the ends of the virtual link with a non-backbone area internal route, is
called the transit area. The ID of the transit area should be specified during
configuration.
The virtual link is activated after the route passing through the transit area is calculated,
which is equivalent to a p2p connection between two ends. Therefore, similar to the
To do...
1-29
Chapter 1 OSPF Configuration
Use the command...
ospf authentication-mode simple
password
undo ospf authentication-mode
simple
ospf authentication-mode md5 key-id
key
undo ospf authentication-mode md5