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Example for Configuring IS-IS DIS Election
Networking Requirements
In Figure 7-30, four switches on the broadcast network communicate using IS-IS. SwitchA and SwitchB are Level-1-2 devices, SwitchC is a Level-1 device, and SwitchD is a Level-2 device. SwitchA with high performance needs to be configured as a Level-2 DIS.
Configuration Roadmap
The configuration roadmap is as follows:
Configure IS-IS to enable network interconnectivity.
Set the DIS priority of SwitchA to 100 so that SwitchA can be elected as a Level-2 DIS.
Procedure
- Configure an IPv4 address for each interface. The configuration details are not described here.
- View the MAC address of the VLANIF interface on each switch. When each VLANIF interface has the same DIS priority, the switch with a larger interface MAC address is elected as the DIS.
# View the MAC address of VLANIF10 on SwitchA.
[~SwitchA] display arp interface vlanif 10
ARP timeout:1200s ARP Entry Types: D - Dynamic, S - Static, I - Interface, O - OpenFlow, RD - Redirect EXP: Expire-time VLAN: VLAN or Bridge Domain
IP ADDRESS MAC ADDRESS EXP(M) TYPE/VLAN INTERFACE VPN-INSTANCE
-----------------------------------------------------------------------------------
10.1.1.1 00e0-fc10-afec I Vlanif10
-----------------------------------------------------------------------------------
Total:1 Dynamic:0 Static:0 Interface:1 OpenFlow:0 Redirect:0
# View the MAC address of VLANIF10 on SwitchB.
[~SwitchB] display arp interface vlanif 10
ARP timeout:1200s ARP Entry Types: D - Dynamic, S - Static, I - Interface, O - OpenFlow, RD - Redirect EXP: Expire-time VLAN: VLAN or Bridge Domain
IP ADDRESS MAC ADDRESS EXP(M) TYPE/VLAN INTERFACE VPN-INSTANCE
-----------------------------------------------------------------------------------
10.1.1.2 00e0-fccd-acdf I Vlanif10
-----------------------------------------------------------------------------------
Total:1 Dynamic:0 Static:0 Interface:1 OpenFlow:0 Redirect:0
# View the MAC address of VLANIF10 on SwitchC.
[~SwitchC] display arp interface vlanif 10
ARP timeout:1200s ARP Entry Types: D - Dynamic, S - Static, I - Interface, O - OpenFlow, RD - Redirect EXP: Expire-time VLAN: VLAN or Bridge Domain
IP ADDRESS MAC ADDRESS EXP(M) TYPE/VLAN INTERFACE VPN-INSTANCE
-----------------------------------------------------------------------------------
10.1.1.3 00e0-fc50-25fe I Vlanif10
-----------------------------------------------------------------------------------
Total:1 Dynamic:0 Static:0 Interface:1 OpenFlow:0 Redirect:0
# View the MAC address of VLANIF10 on SwitchD.
[~SwitchD] display arp interface vlanif 10
ARP timeout:1200s ARP Entry Types: D - Dynamic, S - Static, I - Interface, O - OpenFlow, RD - Redirect EXP: Expire-time VLAN: VLAN or Bridge Domain
IP ADDRESS MAC ADDRESS EXP(M) TYPE/VLAN INTERFACE VPN-INSTANCE
-----------------------------------------------------------------------------------
10.1.1.4 00e0-fcfd-305c I Vlanif10
-----------------------------------------------------------------------------------
Total:1 Dynamic:0 Static:0 Interface:1 OpenFlow:0 Redirect:0
- Configure IS-IS protocol.
# Configure SwitchA.
[~SwitchA] isis 1
[*SwitchA-isis-1] network-entity 10.0000.0000.0001.00
[*SwitchA-isis-1] quit
[*SwitchA] interface vlanif 10
[*SwitchA-Vlanif10] isis enable 1
[*SwitchA-Vlanif10] commit
[~SwitchA-Vlanif10] quit
# Configure SwitchB.
[~SwitchB] isis 1
[*SwitchB-isis-1] network-entity 10.0000.0000.0002.00
[*SwitchB-isis-1] quit
[*SwitchB] interface vlanif 10
[*SwitchB-Vlanif10] isis enable 1
[*SwitchB-Vlanif10] commit
[~SwitchB-Vlanif10] quit
# Configure SwitchC.
[~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 vlanif 10
[*SwitchC-Vlanif10] isis enable 1
[*SwitchC-Vlanif10] commit
[~SwitchC-Vlanif10] quit
# Configure SwitchD.
[~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 vlanif 10
[*SwitchD-Vlanif10] isis enable 1
[*SwitchD-Vlanif10] commit
[~SwitchD-Vlanif10] quit
# Check IS-IS neighbor information on SwitchA.
[~SwitchA] display isis peer
Peer Information for ISIS(80) -------------------------------------------------------------------------------- System ID Interface Circuit ID State HoldTime(s) Type PRI -------------------------------------------------------------------------------- 0000.0000.0002 Vlanif10 0000.0000.0002.01 Up 8 L1(L1L2) 64 0000.0000.0003 Vlanif10 0000.0000.0002.01 Up 29 L1 64 0000.0000.0002 Vlanif10 0000.0000.0002.01 Up 6 L2(L1L2) 64 0000.0000.0004 Vlanif10 0000.0000.0002.01 Up 27 L2 64 Total Peer(s): 4# View IS-IS interface information on SwitchA.
[~SwitchA] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 No/No
# View IS-IS interface information on SwitchB.
[~SwitchB] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 Yes/No
# View IS-IS interface information on SwitchD.
[~SwitchD] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 No/Yes
As shown in the preceding interface information, when the default DIS priority is used, the IS-IS interface on SwitchB has the largest MAC address among all the interfaces on the Level-1 Switches. Therefore, SwitchB is elected as a Level-1 DIS. The IS-IS interface on SwitchD has the largest MAC address among all the interfaces on the Level-2 Switches. Therefore, SwitchD is elected as a Level-2 DIS. Level-1 and Level-2 pseudonodes are 0000.0000.0002.01 and 0000.0000.0004.01 respectively.
- Configure the DIS priority of SwitchA.
[~SwitchA] interface vlanif 10
[*SwitchA-Vlanif10] isis dis-priority 100
[*SwitchA-Vlanif10] commit
# View IS-IS neighbor information on SwitchA.
[~SwitchA] display isis peer
Peer Information for ISIS(80) -------------------------------------------------------------------------------- System ID Interface Circuit ID State HoldTime(s) Type PRI -------------------------------------------------------------------------------- 0000.0000.0002 Vlanif10 0000.0000.0001.01 Up 23 L1(L1L2) 64 0000.0000.0003 Vlanif10 0000.0000.0001.01 Up 27 L1 64 0000.0000.0002 Vlanif10 0000.0000.0001.01 Up 23 L2(L1L2) 64 0000.0000.0004 Vlanif10 0000.0000.0001.01 Up 23 L2 64 Total Peer(s): 4 - Verify the configuration.
# View IS-IS interface information on SwitchA.
[~SwitchA] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 Yes/Yes
As shown in the preceding information, after the DIS priority of the IS-IS interface on Switch is changed, SwitchA becomes a Level-1-2 DIS (DR) immediately and its pseudonode is 0000.0000.0001.01.
# View IS-IS neighbor and interface information on SwitchB.
[~SwitchB] display isis peer
Peer Information for ISIS(1) -------------------------------------------------------------------------------- System ID Interface Circuit ID State HoldTime(s) Type PRI -------------------------------------------------------------------------------- 0000.0000.0001 Vlanif10 0000.0000.0001.01 Up 8 L1(L1L2) 100 0000.0000.0003 Vlanif10 0000.0000.0001.01 Up 22 L1 64 0000.0000.0001 Vlanif10 0000.0000.0001.01 Up 8 L2(L1L2) 100 0000.0000.0004 Vlanif10 0000.0000.0001.01 Up 26 L2 64 Total Peer(s): 4[~SwitchB] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 No/No
# View IS-IS neighbor and interface information on SwitchD.
[~SwitchD] display isis peer
Peer Information for ISIS(1) -------------------------------------------------------------------------------- System ID Interface Circuit ID State HoldTime(s) Type PRI -------------------------------------------------------------------------------- 0000.0000.0001 Vlanif10 0000.0000.0001.01 Up 8 L2 100 0000.0000.0002 Vlanif10 0000.0000.0001.01 Up 22 L2 64 Total Peer(s): 2[~SwitchD] display isis interface
Interface Information for ISIS(1) -------------------------------------------------------------------------------- Interface ID IPV4 State IPV6 State MTU Type DIS Vlanif10 001 Up Mtu:Up/Lnk:Dn/IP:Dn 1497 L1/L2 No/No
Configuration Files
- Configuration file of SwitchA
# sysname SwitchA # vlan batch 10 # isis 1 network-entity 10.0000.0000.0001.00 # interface Vlanif10 ip address 10.1.1.1 255.255.255.0 isis enable 1 isis dis-priority 100 # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # return - Configuration file of SwitchB
# sysname SwitchB # vlan batch 10 # isis 1 network-entity 10.0000.0000.0002.00 # interface Vlanif10 ip address 10.1.1.2 255.255.255.0 isis enable 1 # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # return - Configuration file of SwitchC
# sysname SwitchC # vlan batch 10 # isis 1 is-level level-1 network-entity 10.0000.0000.0003.00 # interface Vlanif10 ip address 10.1.1.3 255.255.255.0 isis enable 1 # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # return - Configuration file of SwitchD
# sysname SwitchD # vlan batch 10 # isis 1 is-level level-2 network-entity 10.0000.0000.0004.00 # interface Vlanif10 ip address 10.1.1.4 255.255.255.0 isis enable 1 # interface 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # return