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IS-IS实验

如下拓扑：

实验需求：

1. 客户网络所有路由器路由协议要求启用IS-IS，使全网路由可达。

2. 全部IS-IS进程号统一为100，其中AR1在Area 49.0001区域为DIS，AR4与AR5之间要求采用P2P网络类型

3. AR5引入直连链路192.168.X.X，要求AR1访问Area49.0002走最优路径。

   根据上述描述，进行正确配置，使网络路由达到客户需求

配置IP地址

------------------------------------------------ # AR1配置  sysname AR1 # interface GigabitEthernet0/0/0  ip address 123.1.1.1 255.255.255.0  # interface LoopBack0  ip address 1.1.1.1 255.255.255.255 ------------------------------------------------ # AR2配置  sysname AR2 # interface GigabitEthernet0/0/0  ip address 123.1.1.2 255.255.255.0  # interface GigabitEthernet0/0/1  ip address 24.1.1.2 255.255.255.0  ------------------------------------------------ # AR3配置  sysname AR3 # interface Serial1/0/0  link-protocol ppp  ip address 34.1.1.3 255.255.255.0  # interface GigabitEthernet0/0/0  ip address 123.1.1.3 255.255.255.0 ------------------------------------------------ # AR4配置  sysname AR4 # interface Serial1/0/0  link-protocol ppp  ip address 34.1.1.4 255.255.255.0  # interface GigabitEthernet0/0/0  ip address 24.1.1.4 255.255.255.0  # interface GigabitEthernet0/0/2  ip address 45.1.1.4 255.255.255.0  ------------------------------------------------ # AR5配置  sysname AR5 # interface GigabitEthernet0/0/0  ip address 45.1.1.5 255.255.255.0  # interface LoopBack0  ip address 5.5.5.5 255.255.255.255  # interface LoopBack1  ip address 192.168.1.1 255.255.255.255  # interface LoopBack2  ip address 192.168.2.1 255.255.255.255  # interface LoopBack3  ip address 192.168.3.1 255.255.255.255 

配置基础IS-IS

• AR1为Level-1，AR2、AR3为Level-1-2（默认），AR4、AR5为Level-2

# AR1配置 [AR1]isis 100  //ISIS进程号 [AR1-isis-100]is-level level-1  //配置为Level-1 [AR1-isis-100]network-entity 49.0001.0000.0000.0001.00 [AR1-isis-100]int g0/0/0 [AR1-GigabitEthernet0/0/0]isis enable 100 [AR1-GigabitEthernet0/0/0]int lo 0 [AR1-LoopBack0]isis enable 100  # AR2配置 [AR2]isis 100 [AR2-isis-100]network-entity 49.0001.0000.0000.0002.00 [AR2-isis-100]int g0/0/0 [AR2-GigabitEthernet0/0/0]isis enable 100 [AR2-isis-100]int g0/0/1 [AR2-GigabitEthernet0/0/1]isis enable 100  # AR3配置 [AR3]isis 100 [AR3-isis-100]network-entity 49.0001.0000.0000.0003.00 [AR3-isis-100]int g0/0/0 [AR3-GigabitEthernet0/0/0]isis enable 100 [AR3-GigabitEthernet0/0/0]int s1/0/0 [AR3-Serial1/0/0]isis enable 100  # AR4配置 [AR4]isis 100 [AR4-isis-100]is-level level-2 [AR4-isis-100]network-entity 49.0002.0000.0000.0004.00 [AR4-isis-100]int g0/0/0 [AR4-GigabitEthernet0/0/0]isis enable 100 [AR4-GigabitEthernet0/0/0]int s1/0/0   [AR4-Serial1/0/0]isis enable 100 [AR4-Serial1/0/0]int g0/0/2 [AR4-GigabitEthernet0/0/2]isis enable 100  # AR5配置 [AR5]isis 100 [AR5-isis-100]is-level level-2 [AR5-isis-100]net 49.0002.0000.0000.0005.00 [AR5-isis-100]int g0/0/0 [AR5-GigabitEthernet0/0/0]isis enable 100 [AR5-GigabitEthernet0/0/0]int lo 0 [AR5-LoopBack0]isis enable 100 

详细配置

# 修改优先级,是AR1成为DIS [AR1]int g0/0/0 [AR1-GigabitEthernet0/0/0]isis dis-priority 70  [AR1]dis isis interface g0/0/0  //查看ISIS状态，AR1为Level-1的DIS  # 链路类型修改为P2P [AR4]int g0/0/2 [AR4-GigabitEthernet0/0/2]isis circuit-type p2p  # AR5修改链路类型为P2P [AR5]int g0/0/0 [AR5-GigabitEthernet0/0/0]isis circuit-type p2p 

P2P两端的链路类型都需要修改 

• Level-1引入Level-2,并配置最优路径

# AR5引入直连路由 [AR5]isis 100 [AR5-isis-100]import-route direct  //引入直连路由  # AR2、AR3把Level-2引入Level-1 [AR2]isis 100 [AR2-isis-100]import-route isis level-2 into level-1   [AR3]isis 100 [AR3-isis-100]import-route isis level-2 into level-1   # 修改AR2的开销配置最优路径 [AR2]int g0/0/1 [AR2-GigabitEthernet0/0/1]isis cost 1  //修改开销，ISIS中默认为10  [AR1]dis ip routing-table  //查看路由表信息 

在修改开销之前，AR1访问Area 49.0002通过AR2和AR3负载，修改将AR2的出接口的开销改小，数据会优先从AR2转发
AR2上的接口down后，数据走AR3，恢复后继续从AR2转发

实验练习

如下拓扑：

实验需求：

1. 按照图示配置IP地址
2. 按照图示分区域配置IS-IS，完成全网互通，网段192.168.x.1/24暂不宣告
3. R1、R2、R3 共享网络中，要求R3成为DIS，但只允许在R1与R2上配置
4. R4与R6和R5与 R6 之间不允许有DIS路由器选举
5. 按图示修改各链路 cost，只针对level-2进level-1路由修改开销
6. R6引入192.168.x.1/24网段路由，并标记为100
7. 要求区域 49.0001 能够学习到192.168.x.1/24 明细路由，并能看到标记100，并选择最优路由
8. 要求R4与R5只形成level-1的邻居关系
9. 在骨干网上配置接口认证

过程参考IS-IS实验练习

以上内容均属原创，如有不详或错误，敬请指出。