I am running a lab through dynamips using isis. I have a router R5(level 1 router) which is connected to R6(level-1-2 router). R6 is connected with
other L1-L2 routers. I try to change the ATT-bit when R6 sends LSP-L1 tou R5 when the backbone area is down but unfortunatelly is not working.
I follow the instructions on the following file which I downloaded from the cisco support
" using IS-IS ATT-bit Control Feature"
I used clns filter-set to match the backbone area which was 49.0002
example: clns filter-set match-49.0002-area permit 49.0002
then I used a route-map to match the clns filter name
router-map is-match-49.0002-area permit 10
match clns address match-49.0002
and then under the router config on R6
set-attached-bit route-map is-match-49.0002-area
I am not sure if I am missing anything but when I turn off all the L1-L2 routers except R6 then R6 kept sending LSPs with the att-bit set to 1
and a default route on R5 is pointing to R6 even if the backbone area was down.
Can you please advice?