Example for Configuring Basic IS-IS Functions
Networking Requirements
As shown in Figure 1, there are four switches (SwitchA, SwitchB, SwitchC, and SwitchD) on the network. The four switches need to communicate with each other. SwitchA and SwitchB can only process a small amount of data because they have lower performance than the other two switches.
Configuration Roadmap
The configuration roadmap is as follows:
Enable IS-IS on each switch so that the switches can be interconnected. Configure SwitchA and SwitchB as Level-1 devices to enable them to maintain less data.
Procedure
- Create VLANs and add corresponding interfaces to the VLANs.
# Configure SwitchA. The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA.
<HUAWEI> system-view [HUAWEI] sysname SwitchA [SwitchA] vlan batch 10 [SwitchA] interface gigabitethernet 0/0/1 [SwitchA-GigabitEthernet0/0/1] port link-type trunk [SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 [SwitchA-GigabitEthernet0/0/1] quit
- Assign an IP address to each VLANIF interface.
# Configure SwitchA. The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA.
[SwitchA] interface vlanif 10 [SwitchA-Vlanif10] ip address 10.1.1.2 24 [SwitchA-Vlanif10] quit
- Run the IS-IS progress on each Switch, specify the network entity
title, and configure the level.
# Configure SwitchA.
[SwitchA] isis 1 [SwitchA-isis-1] is-level level-1 [SwitchA-isis-1] network-entity 10.0000.0000.0001.00 [SwitchA-isis-1] quit
# Configure SwitchB.
[SwitchB] isis 1 [SwitchB-isis-1] is-level level-1 [SwitchB-isis-1] network-entity 10.0000.0000.0002.00 [SwitchB-isis-1] quit
# Configure SwitchC.
[SwitchC] isis 1 [SwitchC-isis-1] network-entity 10.0000.0000.0003.00 [SwitchC-isis-1] quit
# Configure SwitchD.
[SwitchD] isis 1 [SwitchD-isis-1] is-level level-2 [SwitchD-isis-1] network-entity 20.0000.0000.0004.00 [SwitchD-isis-1] quit
- Enable the IS-IS progress on each interface.
# Configure SwitchA.
[SwitchA] interface vlanif 10 [SwitchA-Vlanif10] isis enable 1 [SwitchA-Vlanif10] quit
# Configure SwitchB.
[SwitchB] interface vlanif 20 [SwitchB-Vlanif20] isis enable 1 [SwitchB-Vlanif20] quit
# Configure SwitchC.
[SwitchC] interface vlanif 10 [SwitchC-Vlanif10] isis enable 1 [SwitchC-Vlanif10] quit [SwitchC] interface vlanif 20 [SwitchC-Vlanif20] isis enable 1 [SwitchC-Vlanif20] quit [SwitchC] interface vlanif 30 [SwitchC-Vlanif30] isis enable 1 [SwitchC-Vlanif30] quit
# Configure SwitchD.
[SwitchD] interface vlanif 30 [SwitchD-Vlanif30] isis enable 1 [SwitchD-Vlanif30] quit [SwitchD] interface vlanif 40 [SwitchD-Vlanif40] isis enable 1 [SwitchD-Vlanif40] quit
- Verify the configuration.
# View the IS-IS LSDB of each Switch.
[SwitchA] display isis lsdb Database information for ISIS(1) -------------------------------- Level-1 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL ------------------------------------------------------------------------------- 0000.0000.0001.00-00* 0x0000006e 0x953e 862 68 0/0/0 0000.0000.0002.00-00 0x0000006a 0xc015 766 68 0/0/0 0000.0000.0002.01-00 0x00000008 0xccb6 766 55 0/0/0 0000.0000.0003.00-00 0x00000086 0x529e 1155 111 1/0/0 0000.0000.0003.01-00 0x0000005e 0xf238 1155 55 0/0/0 Total LSP(s): 5 *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload
[SwitchB] display isis lsdb Database information for ISIS(1) -------------------------------- Level-1 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL ------------------------------------------------------------------------------- 0000.0000.0001.00-00 0x0000006e 0x953e 899 68 0/0/0 0000.0000.0002.00-00* 0x0000006a 0xc015 808 68 0/0/0 0000.0000.0002.01-00* 0x00000008 0xccb6 808 55 0/0/0 0000.0000.0003.00-00 0x00000086 0x529e 1195 111 1/0/0 0000.0000.0003.01-00 0x0000005e 0xf238 1195 55 0/0/0 Total LSP(s): 5 *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload
[SwitchC] display isis lsdb Database information for ISIS(1) -------------------------------- Level-1 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL ------------------------------------------------------------------------------- 0000.0000.0001.00-00 0x0000006e 0x953e 953 68 0/0/0 0000.0000.0002.00-00 0x0000006a 0xc015 859 68 0/0/0 0000.0000.0002.01-00 0x00000008 0xccb6 859 55 0/0/0 0000.0000.0003.00-00* 0x00000085 0x549d 937 111 1/0/0 0000.0000.0003.01-00* 0x0000005d 0xf437 937 55 0/0/0 Total LSP(s): 5 *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload Level-2 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL ------------------------------------------------------------------------------- 0000.0000.0003.00-00* 0x0000008a 0x513c 876 100 0/0/0 0000.0000.0004.00-00 0x00000063 0x48ad 761 84 0/0/0 0000.0000.0004.01-00 0x0000005b 0x3aef 761 55 0/0/0 Total LSP(s): 3 *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload
[SwitchD] display isis lsdb Database information for ISIS(1) -------------------------------- Level-2 Link State Database LSPID Seq Num Checksum Holdtime Length ATT/P/OL ------------------------------------------------------------------------------- 0000.0000.0003.00-00 0x0000008a 0x513c 901 100 0/0/0 0000.0000.0004.00-00* 0x00000063 0x48ad 789 84 0/0/0 0000.0000.0004.01-00* 0x0000005b 0x3aef 789 55 0/0/0 Total LSP(s): 3 *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-Overload
# View the IS-IS routing table of each Switch. A default route is available in the routing table of the Level-1 devices and the next hop is a Level-1-2 device. The routing table of the Level-2 device contains all Level-1 and Level-2 routes.
[SwitchA] display isis route Route information for ISIS(1) ----------------------------- ISIS(1) Level-1 Forwarding Table -------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags ------------------------------------------------------------------------------- 0.0.0.0/0 10 NULL Vlanif10 10.1.1.1 A/-/-/- 192.168.0.0/24 20 NULL Vlanif10 10.1.1.1 A/-/-/- 10.1.1.0/24 10 NULL Vlanif10 Direct D/-/L/- 10.1.2.0/24 20 NULL Vlanif10 10.1.1.1 A/-/-/- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set
[SwitchB] display isis route Route information for ISIS(1) ----------------------------- ISIS(1) Level-1 Forwarding Table -------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags ------------------------------------------------------------------------------- 0.0.0.0/0 10 NULL Vlanif20 10.1.2.1 A/-/-/- 192.168.0.0/24 20 NULL Vlanif20 10.1.2.1 A/-/-/- 10.1.1.0/24 20 NULL Vlanif20 10.1.2.1 A/-/-/- 10.1.2.0/24 10 NULL Vlanif20 Direct D/-/L/- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set
[SwitchC] display isis route Route information for ISIS(1) ----------------------------- ISIS(1) Level-1 Forwarding Table -------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags ------------------------------------------------------------------------------- 192.168.0.0/24 10 NULL Vlanif30 Direct D/-/L/- 10.1.1.0/24 10 NULL Vlanif10 Direct D/-/L/- 10.1.2.0/24 10 NULL Vlanif20 Direct D/-/L/- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set ISIS(1) Level-2 Forwarding Table -------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags ------------------------------------------------------------------------------- 172.16.1.0/24 20 NULL Vlanif30 192.168.0.2 A/-/-/- 192.168.0.0/24 10 NULL Vlanif30 Direct D/-/L/- 10.1.1.0/24 10 NULL Vlanif10 Direct D/-/L/- 10.1.2.0/24 10 NULL Vlanif20 Direct D/-/L/- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set
[SwitchD] display isis route Route information for ISIS(1) ----------------------------- ISIS(1) Level-2 Forwarding Table -------------------------------- IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags ------------------------------------------------------------------------------- 172.16.1.0/24 10 NULL Vlanif40 Direct D/-/L/- 192.168.0.0/24 10 NULL Vlanif30 Direct D/-/L/- 10.1.1.0/24 20 NULL Vlanif30 192.168.0.1 A/-/-/- 10.1.2.0/24 20 NULL Vlanif30 192.168.0.1 A/-/-/- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set
Configuration Files
SwitchA configuration file
# sysname SwitchA # vlan batch 10 # isis 1 is-level level-1 network-entity 10.0000.0000.0001.00 # interface Vlanif10 ip address 10.1.1.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 10 # return
SwitchB configuration file
# sysname SwitchB # vlan batch 20 # isis 1 is-level level-1 network-entity 10.0000.0000.0002.00 # interface Vlanif20 ip address 10.1.2.2 255.255.255.0 isis enable 1 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 20 # return
SwitchC configuration file
# sysname SwitchC # vlan batch 10 20 30 # isis 1 network-entity 10.0000.0000.0003.00 # interface Vlanif10 ip address 10.1.1.1 255.255.255.0 isis enable 1 # interface Vlanif20 ip address 10.1.2.1 255.255.255.0 isis enable 1 # interface Vlanif30 ip address 192.168.0.1 255.255.255.0 isis enable 1 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 10 # interface GigabitEthernet0/0/2 port link-type trunk port trunk allow-pass vlan 20 # interface GigabitEthernet0/0/3 port link-type trunk port trunk allow-pass vlan 30 # return
SwitchD configuration file
# sysname SwitchD # vlan batch 30 40 # isis 1 is-level level-2 network-entity 20.0000.0000.0004.00 # interface Vlanif30 ip address 192.168.0.2 255.255.255.0 isis enable 1 # interface Vlanif40 ip address 172.16.1.1 255.255.255.0 isis enable 1 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 30 # interface GigabitEthernet0/0/2 port link-type trunk port trunk allow-pass vlan 40 # return