Information Technology Reference
In-Depth Information
IS-IS Areas and IS Types
Figure 8-9
L1 Area
L1/L2 Router
L1 Routers
L2 Area
L2 Routers
L2 Routers
L1 Area
L1/L2 Router
L1 Routers
IS-IS Authentication
IS-IS supports three types of authentication: link authentication, area authentication, and
domain authentication. For all these types, only cleartext password authentication is supported.
You use link authentication between ISs in a common subnetwork (such as Ethernet, private
line). The cleartext password must be common only between the ISs on the link. The password
is configured with the interface command
isis password
password
[
level-1
|
level-2
] command.
The optional
level-1
or
level-2
keywords specify which routes, L1 or L2, use the password. You
must use a separate command for each level;
level-1
is the default.
If you use area authentication, all ISs in the area must use authentication and must have the
same password. The IS-IS area password is configured with the
router isis
sub-command
area-
password
password
.
Use domain authentication on L2 and L1/L2 ISs only. All L2 and L1/L2 ISs must be configured
for authentication and must use the same password. The IS-IS domain password is configured
with the
router isis
sub-command
domain-password
password
.
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