Interfaces are configured in the config>router>interface context, as shown in Figure: Configuring a level 1 area.
Figure: Configuring a level 1 area
The following example displays the command usage to configure a level 1 area.
A:ALA-A>config>router# isis
A:ALA-A>config>router>isis# area-id 47.0001
A:ALA-A>config>router>isis# level-capability level-1
A:ALA-A>config>router>isis# interface system
A:ALA-A>config>router>isis>if# exit
A:ALA-A>config>router>isis# interface A-B
A:ALA-A>config>router>isis>if# exit
A:ALA-A>config>router>isis# interface A-C
A:ALA-A>config>router>isis>if# exit
A:ALA-A>config>router>isis#
A:ALA-B>config>router# isis
A:ALA-B>config>router>isis# area-id 47.0001
A:ALA-B>config>router>isis# level-capability level-1
A:ALA-B>config>router>isis# interface system
A:ALA-B>config>router>isis>if# exit
A:ALA-B>config>router>isis# interface B-A
A:ALA-B>config>router>isis>if# exit
A:ALA-B>config>router>isis# interface B-C
A:ALA-B>config>router>isis>if# exit
A:ALA-B>config>router>isis#
A:ALA-C>config>router# isis
A:ALA-C>config>router>isis# area-id 47.0001
A:ALA-C>config>router>isis# level-capability level-1
A:ALA-C>config>router>isis# interface system
A:ALA-C>config>router>isis>if# exit
A:ALA-C>config>router>isis# interface "C-A"
A:ALA-C>config>router>isis>if# exit
A:ALA-C>config>router>isis# interface "C-B"
A:ALA-C>config>router>isis>if# exit
A:ALA-A>config>router>isis# info
----------------------------------------------
level-capability level-1
area-id 49.0180.0001
interface "system"
exit
interface "A-B"
exit
interface "A-C"
exit
----------------------------------------------
A:ALA-A>config>router>isis#
A:ALA-B>config>router>isis# info
----------------------------------------------
level-capability level-1
area-id 49.0180.0001
interface "system"
exit
interface "B-A"
exit
interface "B-C"
exit
----------------------------------------------
A:ALA-B>config>router>isis#
A:ALA-C>config>router>isis# info
#------------------------------------------
echo "ISIS"
----------------------------------------------
level-capability level-1
area-id 49.0180.0001
interface "system"
exit
interface "C-A"
exit
interface "C-B"
exit
----------------------------------------------
A:ALA-C>config>router>isis#