IS-IS does not redistribute Level 1 external routes into Level 2 by default. You must explicitly apply the policy to redistribute external IS-IS routes. Policies are created in the config>router>policy-options context. See Route policies for more information.
The following is a sample policy statement configuration output.
config>router>policy-options# info
----------------------------------------------
prefix-list "loops"
prefix 10.1.1.0/24 longer
exit
policy-statement "leak"
entry 10
from
prefix-list "loop"
level 2
exit
to
level 1
exit
action accept
exit
exit
exit
policy-statement "isis-ext"
entry 10
from
external
exit
to
level 2
exit
action accept
exit
exit
exit
----------------------------------------------
config>router>policy-options#