3Com S7902E, Configuration Manual

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172.16.0.0/16 20 NULL Vlan300 192.168.0.2 R/-/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
[SwitchD] 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 Vlan300 Direct D/L/-
10.1.1.0/24 20 NULL Vlan300 192.168.0.1 R/-/-
10.1.2.0/24 20 NULL Vlan300 192.168.0.1 R/-/-
172.16.0.0/16 10 NULL Vlan100 Direct D/L/-
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
DIS Election Configuration
Network requirements
As shown in Figure 1-16 , Switch A, B, C and Switch D reside in IS-IS area 10 on a broadcast network
(Ethernet). Switch A and Switch B are Level-1-2 switches, Switch C is a Level-1 switch, and Switch D is
a Level-2 switch.
Change the DIS priority of Switch A to make it elected as the Level-1-2 DIS router.
Figure 1-16 Network diagram for DIS selection
Configuration procedure
1) Configure an IP address for each interface (omitted)
2) Enable IS-IS
# Configure Switch A.