157
Level-2 IPv4 Forwarding Table
-----------------------------
IPv4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------------
192.168.0.0/24 10 NULL Eth1/2 Direct D/L/-
10.1.1.0/24 20 NULL Eth1/2 192.168.0.1 R/-/-
10.1.2.0/24 20 NULL Eth1/2 192.168.0.1 R/-/-
172.16.0.0/16 10 NULL Eth1/1 Direct D/L/-
Flags: D-Direct, R-Added to Rib, 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 as the
Level-1-2 router, and the routing table of Level-2 router contains all Level-1 and Level-2 routes.
DIS election configuration example
Network requirements
As shown in Figure 41, on a broadcast network (Ethernet), Router A, Router B, Router C, and Router D
reside in IS-IS Area 10. Router A and Router B are Level-1-2 routers, Router C is a Level-1 router, and Router
D is a Level-2 router.
Change the DIS priority of Router A to make it elected as the Level-1-2 DIS router.
Figure 41 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Enable IS-IS:
# Configure Router A.
<RouterA> system-view
[RouterA] isis 1
[RouterA-isis-1] network-entity 10.0000.0000.0001.00
[RouterA-isis-1] quit
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