Dis Election Configuration - 3Com S7906E Configuration Manual

172.16.0.0/16
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
[SwitchD] display isis route
IPV4 Destination
--------------------------------------------------------------------------
192.168.0.0/24
10.1.1.0/24
10.1.2.0/24
172.16.0.0/16
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
(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.
20 NULL
Route information for ISIS(1)
-----------------------------
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IntCost ExtCost ExitInterface
10 NULL
20 NULL
20 NULL
10 NULL
1-16, Switch A, B, C and Switch D reside in IS-IS area 10 on a broadcast network
Vlan300 192.168.0.2
NextHop
Vlan300 Direct
Vlan300 192.168.0.1
Vlan300 192.168.0.1
Vlan100 Direct
1-41
R/-/-
Flags
D/L/-
R/-/-
R/-/-
D/L/-