3Com Switch 4800G 24-Port Configuration Manual page 357

IPV4 Destination
--------------------------------------------------------------------------
192.168.0.0/24
10.1.1.0/24
10.1.2.0/24
IPV4 Destination
--------------------------------------------------------------------------
192.168.0.0/24
10.1.1.0/24
10.1.2.0/24
172.16.0.0/16
[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
DIS Selection Network requirements
Configuration
As shown in Figure 113, 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 selected as the Level-1-2 DIS router.
Route information for ISIS(1)
-----------------------------
ISIS(1) IPv4 Level-1 Forwarding Table
-------------------------------------
IntCost
10
10
10
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IntCost
10
10
10
20
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
Route information for ISIS(1)
-----------------------------
ISIS(1) IPv4 Level-2 Forwarding Table
-------------------------------------
IntCost
10
20
20
10
Flags: D-Direct, R-Added to RM, L-Advertised in LSPs, U-Up/Down Bit Set
IS-IS Configuration Example
ExtCost ExitInterface
NULL Vlan300
NULL Vlan100
NULL Vlan200
ExtCost ExitInterface
NULL Vlan300
NULL Vlan100
NULL Vlan200
NULL Vlan300
ExtCost ExitInterface
NULL Vlan300
NULL Vlan300
NULL Vlan300
NULL Vlan100
357
NextHop Flags
Direct D/L/-
Direct D/L/-
Direct D/L/-
NextHop Flags
Direct D/L/-
Direct D/L/-
Direct D/L/-
192.168.0.2 R/-/-
NextHop Flags
Direct D/L/-
192.168.0.1 R/-/-
192.168.0.1 R/-/-
Direct D/L/-