Dis Election Configuration Example - HP HPE FlexNetwork 7500 series Configuration Manual

IPv4 Destination
-------------------------------------------------------------------------------
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.
IntCost
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 44, Switches A, B, C, and D reside in IS-IS area 10 on a broadcast network
ExtCost ExitInterface
NULL Vlan300
NULL Vlan100
NULL Vlan200
ExtCost ExitInterface
NULL
NULL
NULL
NULL Vlan300
ExtCost ExitInterface
NULL Vlan300
NULL Vlan300
NULL Vlan300
NULL Vlan100
173
NextHop Flags
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/-