The most basic router configuration must have the following:
system name
system address
The following is a sample router configuration output.
A:ALA-A> config# info
. . .
#------------------------------------------
# Router Configuration
#------------------------------------------
router
interface "system"
address 10.10.10.103/32
exit
interface "to-104"
address 10.0.0.103/24
port 1/1/1
exit
exit
autonomous-system 12345
router-id 10.10.10.103
...
exit
isis
exit
...
#------------------------------------------
A:ALA-A> config#