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Example for Configuring Basic IS-IS Functions
Networking Requirements
As shown in Figure 7-29, there are four devices (SwitchA, SwitchB, SwitchC, and SwitchD) on the network. The four devices 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 devices.
Configuration Roadmap
The configuration roadmap is as follows:
Enable IS-IS on each device so that the devices can be interconnected. Configure SwitchA and SwitchB as Level-1 devices to enable them to maintain less data.
Procedure
- Configure VLANs that each interface belongs to.
<HUAWEI> system-view [~HUAWEI] sysname SwitchA [*HUAWEI] commit [~SwitchA] vlan 10 [*SwitchA-vlan10] quit [*SwitchA] interface 10ge 1/0/1 [*SwitchA-10GE1/0/1] port link-type trunk [*SwitchA-10GE1/0/1] port trunk allow-pass vlan 10 [*SwitchA-10GE1/0/1] commit [~SwitchA-10GE1/0/1] quit
The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA, and are not provided here.
- Assign the IP addresses for VLANIF interfaces.
[~SwitchA] interface vlanif 10 [*SwitchA-Vlanif10] ip address 10.1.1.2 24 [*SwitchA-Vlanif10] commit [~SwitchA-Vlanif10] quit
The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA, and are not provided here.
- Configure basic IS-IS functions.
# 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
[*SwitchA] interface vlanif 10
[*SwitchA-Vlanif10] isis enable 1
[*SwitchA-Vlanif10] commit
[~SwitchA-Vlanif10] 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
[*SwitchB] interface vlanif 20
[*SwitchB-Vlanif20] isis enable 1
[*SwitchA-Vlanif20] commit
[~SwitchB-Vlanif20] quit
# Configure SwitchC.
[~SwitchC] isis 1
[*SwitchC-isis-1] network-entity 10.0000.0000.0003.00
[*SwitchC-isis-1] quit
[*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] commit
[~SwitchC-Vlanif30] 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
[*SwitchD] interface vlanif 30
[*SwitchD-Vlanif30] isis enable 1
[*SwitchD-Vlanif30] quit
[*SwitchD] interface vlanif 40
[*SwitchD-Vlanif40] isis enable 1
[*SwitchD-Vlanif40] commit
[~SwitchD-Vlanif40] quit
- Verify the configuration.
# View the IS-IS LSDB information of each switch.
[~SwitchA] display isis lsdb
Database Information for ISIS(1) -------------------------------------------------------------------------------- Level-1 Link State Database *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-OverloadLSPID Seq Num Checksum HoldTime(s) Length ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0001.00-00* 0x00000006 0xbf7d 649 68 0/0/0
0000.0000.0002.00-00 0x00000003 0xef4d 545 68 0/0/0
0000.0000.0003.00-00 0x00000008 0x3340 582 111 1/0/0
Total LSP(s): 3
[~SwitchB] display isis lsdb
Database Information for ISIS(1) -------------------------------------------------------------------------------- Level-1 Link State Database *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-OverloadLSPID Seq Num Checksum HoldTime(s) Length ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0001.00-00 0x00000006 0xbf7d 642 68 0/0/0
0000.0000.0002.00-00* 0x00000003 0xef4d 538 68 0/0/0
0000.0000.0003.00-00 0x00000008 0x3340 574 111 1/0/0
Total LSP(s): 3
[~SwitchC] display isis lsdb
Database Information for ISIS(1) -------------------------------------------------------------------------------- Level-1 Link State Database *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-OverloadLSPID Seq Num Checksum HoldTime(s) Length ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0001.00-00 0x00000006 0xbf7d 638 68 0/0/0
0000.0000.0002.00-00 0x00000003 0xef4d 533 68 0/0/0
0000.0000.0003.00-00* 0x00000008 0x3340 569 111 1/0/0
Total LSP(s): 3
Level-2 Link State Database *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-OverloadLevel-2 Link State Database
LSPID Seq Num Checksum HoldTime(s) Length ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0003.00-00* 0x00000008 0x55bb 650 100 0/0/0
0000.0000.0004.00-00 0x00000005 0x651 629 84 0/0/0
Total LSP(s): 2
[~SwitchD] display isis lsdb
Database Information for ISIS(1) -------------------------------------------------------------------------------- Level-2 Link State Database *(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended), ATT-Attached, P-Partition, OL-OverloadLSPID Seq Num Checksum HoldTime(s) Length ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0003.00-00 0x00000008 0x55bb 644 100 0/0/0
0000.0000.0004.00-00* 0x00000005 0x651 624 84 0/0/0
Total LSP(s): 2
# View the IS-IS routing information of each switch. The routing table of a Level-1 device contains a default route with the next hop as a Level-1-2 device. The routing table of a Level-2 device contains all Level-1 and Level-2 routes.
[~SwitchA] display isis route
Route Information for ISIS(1) -------------------------------------------------------------------------------- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set 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/-/-/-
10.1.1.0/24 10 NULL - Direct D/-/L/-
10.1.2.0/24 20 NULL Vlanif10 10.1.1.1 A/-/-/-
192.168.0.0/24 20 NULL Vlanif10 10.1.1.1 A/-/-/-
[~SwitchC] display isis route
Route Information for ISIS(1) -------------------------------------------------------------------------------- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set ISIS(1) Level-1 Forwarding Table --------------------------------------------------------------------------------IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------
10.1.1.0/24 10 NULL - Direct D/-/L/-
10.1.2.0/24 10 NULL - Direct D/-/L/-
192.168.0.0/24 10 NULL - Direct D/-/L/-
ISIS(1) Level-2 Forwarding Table --------------------------------------------------------------------------------IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------
10.1.1.0/24 10 NULL - Direct D/-/L/-
10.1.2.0/24 10 NULL - Direct D/-/L/-
172.16.0.0/16 20 NULL Vlanif30 192.168.0.2 A/-/-/-
192.168.0.0/24 10 NULL - Direct D/-/L/-
[~SwitchD] display isis route
Route Information for ISIS(1) -------------------------------------------------------------------------------- Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut, U-Up/Down Bit Set ISIS(1) Level-1 Forwarding Table --------------------------------------------------------------------------------IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
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/-/-/-
172.16.0.0/16 10 NULL - Direct D/-/L/-
192.168.0.0/24 10 NULL - Direct D/-/L/-
Configuration Files
- Configuration file of SwitchA
# 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 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # return - Configuration file of SwitchB
# 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 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 20 # return - Configuration file of SwitchC
# 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 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 10 # interface 10GE1/0/2 port link-type trunk port trunk allow-pass vlan 20 # interface 10GE1/0/3 port link-type trunk port trunk allow-pass vlan 30 # return - Configuration file of SwitchD
# 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 10GE1/0/1 port link-type trunk port trunk allow-pass vlan 30 # interface 10GE1/0/2 port link-type trunk port trunk allow-pass vlan 40 # return