学习精彩网络技术老师：华为HCIA和HCIP数通eNSP实战视频课
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举例说明通过IS-IS协议实现IPv4网络互连的基本配置方法。
组网需求
如图1所示：
路由器RouterA、RouterB、RouterC和RouterD属于同一自治系统，要求它们之间通过IS-IS协议达到IP网络互连的目的。
RouterA、RouterB和RouterC属于区域10，RouterD属于区域20。
RouterA和RouterB是Level-1路由器，RouterC是Level-1-2路由器，RouterD是Level-2路由器。
配置思路
采用如下的思路配置IS-IS的基本功能：
在各路由器上使能IS-IS，配置level级别，指定网络实体。
配置RouterA和RouterC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。
数据准备
为完成此配置例，需准备如下的数据：
RouterA、RouterB、RouterC和RouterD的区域地址。
RouterA、RouterB、RouterC和RouterD的级别。
操作步骤
- 配置各接口的IP地址（略）
请根据图1配置接口的IP地址，具体配置请参见配置文件。
- 配置IS-IS基本功能
# 配置RouterA。
[RouterA] isis 1
[RouterA-isis-1] is-level level-1
[RouterA-isis-1] network-entity 10.0000.0000.0001.00
[RouterA-isis-1] quit
[RouterA] interface pos 1/0/0
[RouterA-Pos1/0/0] isis enable 1
[RouterA-Pos1/0/0] quit
# 配置RouterB。
[RouterB] isis 1
[RouterB-isis-1] is-level level-1
[RouterB-isis-1] network-entity 10.0000.0000.0002.00
[RouterB-isis-1] quit
[RouterB] interface pos 1/0/0
[RouterB-Pos1/0/0] isis enable 1
[RouterB-Pos1/0/0] quit
# 配置RouterC。
[RouterC] isis 1
[RouterC-isis-1] is-level level-1-2
[RouterC-isis-1] network-entity 10.0000.0000.0003.00
[RouterC-isis-1] quit
[RouterC] interface pos 1/0/0
[RouterC-Pos1/0/0] isis enable 1
[RouterC-Pos1/0/0] quit
[RouterC] interface pos 2/0/0
[RouterC-Pos2/0/0] isis enable 1
[RouterC-Pos2/0/0] quit
[RouterC] interface pos 3/0/0
[RouterC-Pos3/0/0] isis enable 1
[RouterC-Pos3/0/0] quit
# 配置RouterD。
[RouterD] isis 1
[RouterD-isis-1] is-level level-2
[RouterD-isis-1] network-entity 20.0000.0000.0004.00
[RouterD-isis-1] quit
[RouterD] interface gigabitethernet 2/0/0
[RouterD-GigabitEthernet2/0/0] isis enable 1
[RouterD-GigabitEthernet2/0/0] quit
[RouterD] interface pos 1/0/0
[RouterD-Pos1/0/0] isis enable 1
[RouterD-Pos1/0/0] quit
- 配置RouterA和RouterC验证Hello报文的认证模式和密码。
# 配置RouterA。
[RouterA] interface pos 1/0/0
[RouterA-Pos1/0/0] isis authentication-mode md5 huawei
# 配置RouterC。
[RouterC] interface pos 1/0/0
[RouterC-Pos1/0/0] isis authentication-mode md5 huawei
- 验证配置结果
# 显示各路由器的IS-IS LSDB信息。
[RouterA] 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* 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
*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
ATT-Attached, P-Partition, OL-Overload
[RouterB] 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 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
*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
ATT-Attached, P-Partition, OL-Overload
[RouterC] 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 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
*(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 0x55bb 650 100 0/0/0
0000.0000.0004.00-00 0x00000005 0x6510 629 84 0/0/0
Total LSP(s): 2
*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
ATT-Attached, P-Partition, OL-Overload
[RouterD] 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 0x00000008 0x55bb 644 100 0/0/0
0000.0000.0004.00-00* 0x00000005 0x6510 624 84 0/0/0
Total LSP(s): 2
*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
ATT-Attached, P-Partition, OL-Overload
# 显示各路由器的IS-IS路由信息。Level-1路由器的路由表中应该有一条缺省路由，且下一跳为Level-1-2路由器，Level-2路由器应该有所有Level-1和Level-2的路由。
[RouterA] 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 P1/0/0 Direct D/-/L/-
10.1.2.0/24 20 NULL P1/0/0 10.1.1.1 A/-/-/-
192.168.0.0/24 20 NULL P1/0/0 10.1.1.1 A/-/-/-
0.0.0.0/0 10 NULL P1/0/0 10.1.1.1 A/-/-/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set
[RouterC] 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 P1/0/0 Direct D/-/L/-
10.1.2.0/24 10 NULL P2/0/0 Direct D/-/L/-
192.168.0.0/24 10 NULL P3/0/0 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
-------------------------------------------------------------------------
10.1.1.0/24 10 NULL P1/0/0 Direct D/-/L/-
10.1.2.0/24 10 NULL P2/0/0 Direct D/-/L/-
192.168.0.0/24 10 NULL P3/0/0 Direct D/-/L/-
172.16.0.0/16 20 NULL P3/0/0 192.168.0.2 A/-/-/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set
[RouterD] display isis route
Route information for ISIS(1)
-----------------------------
ISIS(1) Level-2 Forwarding Table
--------------------------------
IPV4 Destination IntCost ExtCost ExitInterface NextHop Flags
--------------------------------------------------------------------------
192.168.0.0/24 10 NULL P1/0/0 Direct D/-/L/-
10.1.1.0/24 20 NULL P1/0/0 192.168.0.1 A/-/-/-
10.1.2.0/24 20 NULL P1/0/0 192.168.0.1 A/-/-/-
172.16.0.0/16 10 NULL GE2/0/0 Direct D/-/L/-
Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
U-Up/Down Bit Set
配置文件
RouterA的配置文件
#
sysname RouterA
#
isis 1
is-level level-1
network-entity 10.0000.0000.0001.00
#
interface Pos1/0/0
link-protocol ppp
ip address 10.1.1.2 255.255.255.0
isis enable 1
isis authentication-mode md5 N`C55QK<`=/Q=^Q`MAF4<1!!
#
return
RouterB的配置文件
#
sysname RouterB
#
isis 1
is-level level-1
network-entity 10.0000.0000.0002.00
#
interface Pos1/0/0
link-protocol ppp
ip address 10.1.2.2 255.255.255.0
isis enable 1
#
return
RouterC的配置文件
#
sysname RouterC
#
isis 1
is-level level-1-2
network-entity 10.0000.0000.0003.00
#
interface Pos1/0/0
link-protocol ppp
ip address 10.1.1.1 255.255.255.0
isis enable 1
isis authentication-mode md5 N`C55QK<`=/Q=^Q`MAF4<1!!
#
interface Pos2/0/0
link-protocol ppp
ip address 10.1.2.1 255.255.255.0
isis enable 1
#
interface Pos3/0/0
link-protocol ppp
ip address 192.168.0.1 255.255.255.0
isis enable 1
#
return
RouterD的配置文件
#
sysname RouterD
#
isis 1
is-level level-2
network-entity 20.0000.0000.0004.00
#
interface GigabitEthernet2/0/0
ip address 172.16.1.1 255.255.0.0
isis enable 1
#
interface Pos1/0/0
link-protocol ppp
ip address 192.168.0.2 255.255.255.0
isis enable 1
#
return
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