Dis Election Configuration Example - HP FlexFabric 12900E Series Configuration Manual

192.168.0.0/24
10.1.1.0/24
10.1.2.0/24
Flags: D-Direct, R-Added to Rib, L-Advertised in LSPs, U-Up/Down Bit Set
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 Rib, 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 Rib, L-Advertised in LSPs, U-Up/Down Bit Set
The output shows that the routing table of Level-1 switches contains a default route with the next hop
as the Level-1-2 switch. The routing table of Level-2 switch contains both routing information of
Level-1 and Level-2.

DIS election configuration example

Network requirements
As shown in
(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.
10
10
10
Level-2 IPv4 Forwarding Table
-----------------------------
IntCost
10
10
10
20
Route information for IS-IS(1)
------------------------------
Level-2 IPv4 Forwarding Table
-----------------------------
IntCost
10
20
20
10
Figure 43, Switches A, B, C, and D reside in IS-IS area 10 on a broadcast network
NULL Vlan300
NULL Vlan100
NULL Vlan200
ExtCost ExitInterface
NULL
NULL
NULL
NULL Vlan300
ExtCost ExitInterface
NULL Vlan300
NULL Vlan300
NULL Vlan300
NULL Vlan100
169
Direct D/L/-
Direct D/L/-
Direct D/L/-
NextHop Flags
D/L/-
D/L/-
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/-