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F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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192.168.0.0/24 10 NULL GE1/2 Direct D/L/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
10.1.1.0/24 10 NULL GE1/1 Direct D/L/-
10.1.2.0/24 10 NULL GE1/3 Direct D/L/-
192.168.0.0/24 10 NULL GE1/2 Direct D/L/-
172.16.0.0/16 20 NULL GE1/2 192.168.0.2 R/-/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
[RouterC] display isis route
Route information for ISIS(1)
-----------------------------
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
192.168.0.0/24 10 NULL GE1/2 Direct D/L/-
10.1.1.0/24 20 NULL GE1/2 192.168.0.1 R/-/-
10.1.2.0/24 20 NULL GE1/2 192.168.0.1 R/-/-
172.16.0.0/16 10 NULL GE1/1 Direct D/L/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
The output shows that the routing table of Level-1 routers contains a default route with the next hop
being the Level-1-2 router, and the routing table of Level-2 router contains all Level-1 and Level-2
routes.
700BDIS election configuration example
1472BNetwork requirements
As shown in 2645HFigure 280, on a broadcast network (Ethernet), Router A, Router B, Router C, and Firewall
reside in IS-IS area 10. Router A and Firewall are Level-1-2 routers, Router B is a Level-1 router, and Router
C is a Level-2 router.
Change the DIS priority of Firewall to make it elected as the Level-1-2 DIS router.