DIS election configuration example
Network requirements
As shown in Figure 41, Switches A, B, C, and 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 41: Network diagram
Configuration procedure
Configure IP addresses for interfaces. (Details not shown.)
Enable IS-IS:
# Configure Switch A.
<SwitchA> system-view [SwitchA] isis 1 [SwitchA-isis-1] network-entity 10.0000.0000.0001.00 [SwitchA-isis-1] quit [SwitchA] interface vlan-interface 100 [SwitchA-Vlan-interface100] isis enable 1 [SwitchA-Vlan-interface100] quit
# Configure Switch B.
<SwitchB> system-view [SwitchB] isis 1 [SwitchB-isis-1] network-entity 10.0000.0000.0002.00 [SwitchB-isis-1] quit [SwitchB] interface vlan-interface 100 [SwitchB-Vlan-interface100] isis enable 1 [SwitchB-Vlan-interface100] quit
# Configure Switch C.
<SwitchC> system-view [SwitchC] isis 1 [SwitchC-isis-1] network-entity 10.0000.0000.0003.00 [SwitchC-isis-1] is-level level-1 [SwitchC-isis-1] quit [SwitchC] interface vlan-interface 100 [SwitchC-Vlan-interface100] isis enable 1 [SwitchC-Vlan-interface100] quit
# Configure Switch D.
<SwitchD> system-view [SwitchD] isis 1 [SwitchD-isis-1] network-entity 10.0000.0000.0004.00 [SwitchD-isis-1] is-level level-2 [SwitchD-isis-1] quit [SwitchD] interface vlan-interface 100 [SwitchD-Vlan-interface100] isis enable 1 [SwitchD-Vlan-interface100] quit
# Display information about IS-IS neighbors on Switch A.
[SwitchA] display isis peer Peer information for IS-IS(1) ---------------------------- System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0003.01 State: Up HoldTime: 21s Type: L1(L1L2) PRI: 64 System Id: 0000.0000.0003 Interface: Vlan-interface100 Circuit Id: 0000.0000.0003.01 State: Up HoldTime: 27s Type: L1 PRI: 64 System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0004.01 State: Up HoldTime: 28s Type: L2(L1L2) PRI: 64 System Id: 0000.0000.0004 Interface: Vlan-interface100 Circuit Id: 0000.0000.0004.01 State: Up HoldTime: 30s Type: L2 PRI: 64# Display information about IS-IS interfaces on Switch A.
[SwitchA] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 No/No# Display information about IS-IS interfaces on Switch C.
[SwitchC] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 Yes/No# Display information about IS-IS interfaces on Switch D.
[SwitchD] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 No/YesThe output shows that when the default DIS priority is used, Switch C is the DIS for Level-1, and Switch D is the DIS for Level-2. The pseudonodes of Level-1 and Level-2 are 0000.0000.0003.01 and 0000.0000.0004.01.
#Configure the DIS priority of Switch A.
[SwitchA] interface vlan-interface 100 [SwitchA-Vlan-interface100] isis dis-priority 100 [SwitchA-Vlan-interface100] quit
# Display IS-IS neighbors on Switch A.
[SwitchA] display isis peer Peer information for IS-IS(1) ---------------------------- System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 21s Type: L1(L1L2) PRI: 64 System Id: 0000.0000.0003 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 27s Type: L1 PRI: 64 System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 28s Type: L2(L1L2) PRI: 64 System Id: 0000.0000.0004 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 30s Type: L2 PRI: 64# Display information about IS-IS interfaces on Switch A.
[SwitchA] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 Yes/YesThe output shows that after the DIS priority configuration, Switch A becomes the DIS for Level-1-2, and the pseudonode is 0000.0000.0001.01.
# Display information about IS-IS neighbors and interfaces on Switch C.
[SwitchC] display isis peer Peer information for IS-IS(1) ---------------------------- System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 25s Type: L1 PRI: 64 System Id: 0000.0000.0001 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 7s Type: L1 PRI: 100 [SwitchC] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 No/No# Display information about IS-IS neighbors and interfaces on Switch D.
[SwitchD] display isis peer Peer information for IS-IS(1) ---------------------------- System Id: 0000.0000.0001 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 9s Type: L2 PRI: 100 System Id: 0000.0000.0002 Interface: Vlan-interface100 Circuit Id: 0000.0000.0001.01 State: Up HoldTime: 28s Type: L2 PRI: 64 [SwitchD] display isis interface Interface information for IS-IS(1) ---------------------------------- Interface: Vlan-interface100 Id IPv4.State IPv6.State MTU Type DIS 001 Up Down 1497 L1/L2 No/No