玩转华为ENSP模拟器系列 | 配置IS-IS基本功能示例
素材来源：华为路由器配置指南
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目标
介绍IS-IS基本功能的配置过程，包括在各设备上指定网络实体名、配置level级别和使能IS-IS。
组网需求
DeviceA、DeviceB、DeviceC和DeviceD之间通过IS-IS协议实现IP网络互连。
DeviceA、DeviceB和DeviceC属于区域10，DeviceD属于区域20。
DeviceA和DeviceB是Level-1设备，DeviceC是Level-1-2设备，DeviceD是Level-2设备。
配置思路
- 在各路由器上使能IS-IS，配置level级别，指定网络实体。
- 配置DeviceA和DeviceC以指定的方式和密码验证Hello报文。
- 查看各路由器的IS-IS数据库信息及路由表信息。
操作步骤
- 配置各接口的IP地址（略）
- 配置IS-IS基本功能
配置DeviceA
DeviceA:
isis 1
is-level level-1
network-entity 10.0000.0000.0001.00
interface Ethernet1/0/0
isis enable 1
配置DeviceB
DeviceB:
isis 1
is-level level-1
network-entity 10.0000.0000.0002.00
interface Ethernet1/0/0
isis enable 1
配置DeviceC
DeviceC:
isis 1
network-entity 10.0000.0000.0003.00
interface Ethernet1/0/0
isis enable 1
interface Ethernet1/0/1
isis enable 1
interface Ethernet1/0/2
isis enable 1
配置DeviceD
DeviceD:
isis 1
is-level level-2
network-entity 20.0000.0000.0004.00
interface Ethernet1/0/0
isis enable 1
interface Ethernet1/0/1
isis enable 1
- 配置DeviceA和DeviceC验证Hello报文的认证模式和密码。
配置DeviceA
DeviceA:
interface Ethernet1/0/0
isis authentication-mode md5 cipher %^%#uA%$)Z%t&4"I^%IG\OqNt4A()_z=_BY4=qDg#+_O%^%#
配置DeviceC
DeviceC:
interface Ethernet1/0/0
isis authentication-mode md5 cipher %^%#ucy<7uqB$ZhkRq73gALA,m)p~7QPU8/VJaVBPu#A%^%#
- 验证配置结果
显示各路由器的IS-IS LSDB信息。
[~DeviceA]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* 0x00000007 0x64d6 1097 68 0/0/0
0000.0000.0002.00-00 0x00000005 0x8baf 412 68 0/0/0
0000.0000.0002.01-00 0x00000005 0xd2b3 412 55 0/0/0
0000.0000.0003.00-00 0x0000000a 0x2647 460 111 1/0/0
0000.0000.0003.01-00 0x00000004 0xa7dd 460 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
[~DeviceA]
[~DeviceB]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 0x00000007 0x64d6 1021 68 0/0/0
0000.0000.0002.00-00* 0x00000005 0x8baf 336 68 0/0/0
0000.0000.0002.01-00* 0x00000005 0xd2b3 336 55 0/0/0
0000.0000.0003.00-00 0x0000000a 0x2647 384 111 1/0/0
0000.0000.0003.01-00 0x00000004 0xa7dd 384 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
[~DeviceB]
[~DeviceC]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 0x00000007 0x64d6 981 68 0/0/0
0000.0000.0002.00-00 0x00000006 0x89b0 1196 68 0/0/0
0000.0000.0002.01-00 0x00000006 0xd0b4 1196 55 0/0/0
0000.0000.0003.00-00* 0x0000000a 0x2647 344 111 1/0/0
0000.0000.0003.01-00* 0x00000004 0xa7dd 344 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* 0x00000008 0x3cd3 344 100 0/0/0
0000.0000.0004.00-00 0x0000000a 0x0749 1021 84 0/0/0
0000.0000.0004.01-00 0x00000004 0xe898 566 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
[~DeviceC]
[~DeviceD]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 0x00000009 0x3ad4 1189 100 0/0/0
0000.0000.0004.00-00* 0x0000000a 0x0749 966 84 0/0/0
0000.0000.0004.01-00* 0x00000004 0xe898 510 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
[~DeviceD]
显示各路由器的IS-IS路由信息。Level-1设备的路由表中应该有一条缺省路由，且下一跳为Level-1-2设备，Level-2设备应该有所有Level-1和Level-2的路由。
[~DeviceA]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 Eth1/0/0 10.1.1.1 A/-/-/-
10.1.1.0/24 10 NULL Eth1/0/0 Direct D/-/L/-
10.1.2.0/24 20 NULL Eth1/0/0 10.1.1.1 A/-/-/-
192.168.0.0/24 20 NULL Eth1/0/0 10.1.1.1 A/-/-/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set, LP-Local Prefix-Sid
[~DeviceA]
[~DeviceC] display isis route
Route information for ISIS(1)
-----------------------------
ISIS(1) Level-1 Forwarding Table
--------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------------
10.1.1.0/24 10 NULL Eth1/0/0 Direct D/-/L/-
10.1.2.0/24 10 NULL Eth1/0/2 Direct D/-/L/-
192.168.0.0/24 10 NULL Eth1/0/1 Direct D/-/L/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set, LP-Local Prefix-Sid
ISIS(1) Level-2 Forwarding Table
--------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------------
10.1.1.0/24 10 NULL Eth1/0/0 Direct D/-/L/-
10.1.2.0/24 10 NULL Eth1/0/2 Direct D/-/L/-
172.16.0.0/16 20 NULL Eth1/0/1 192.168.0.2 A/-/-/-
192.168.0.0/24 10 NULL Eth1/0/1 Direct D/-/L/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set, LP-Local Prefix-Sid
[~DeviceC]
[~DeviceD]display isis route
Route information for ISIS(1)
-----------------------------
ISIS(1) Level-2 Forwarding Table
--------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
-------------------------------------------------------------------------------
10.1.1.0/24 20 NULL Eth1/0/0 192.168.0.1 A/-/-/-
10.1.2.0/24 20 NULL Eth1/0/0 192.168.0.1 A/-/-/-
172.16.0.0/16 10 NULL Eth1/0/1 Direct D/-/L/-
192.168.0.0/24 10 NULL Eth1/0/0 Direct D/-/L/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set, LP-Local Prefix-Sid
[~DeviceD]