IS-IS协议配置的实战讲解（可跟做）（IS-IS配置）

IS-IS协议配置的实战讲解（可跟做）（IS-IS配置）

IS-IS应用场景配置

如图所示，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。全部IS-IS进程号统一为100，其中RTA在Area49.0001区域为DIS，RTD与RTE之间要求采用P2P网络类型，RTE引入直连链路192.168.X.X，要求RTA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

NET地址编号

问题一

需不需要配置IP地址？回答：需要有IP地址，原因是路由寻址，在IP环境中，是为了支持IP环境，IP环境中的NET地址是为了标记路由器以及area 而在CLNP环境中，可以不用IP地址

第一步：IP地址的配置和NAT地址配置

AR1的配置

# interface GigabitEthernet0/0/0 ip address 192.168.123.1 255.255.255.0 isis enable 100 # isis 100 is-level level-1 network-entity 49.0001.0000.0000.0001.00 #

AR2的配置

# interface GigabitEthernet0/0/0 ip address 192.168.123.2 255.255.255.0 isis enable 100 # interface GigabitEthernet0/0/1 ip address 192.168.24.2 255.255.255.0 isis enable 100 # isis 100 network-entity 49.0001.0000.0000.0002.00 #

AR3的配置

# interface GigabitEthernet0/0/0 ip address 192.168.123.3 255.255.255.0 isis enable 100 # interface GigabitEthernet0/0/1 ip address 192.168.34.3 255.255.255.0 isis enable 100 # isis 100 network-entity 49.0001.0000.0000.0003.00 #

AR4的配置

# interface GigabitEthernet0/0/0 ip address 192.168.34.4 255.255.255.0 isis enable 100 # interface GigabitEthernet0/0/1 ip address 192.168.24.4 255.255.255.0 isis enable 100 # interface GigabitEthernet0/0/2 ip address 192.168.45.4 255.255.255.0 isis enable 100 # isis 100 is-level level-2 network-entity 49.0002.0000.0000.0004.00 #

AR5的配置

# interface GigabitEthernet0/0/2 ip address 192.168.45.5 255.255.255.0 isis enable 100 # interface LoopBack1 ip address 192.168.1.1 255.255.255.0 # interface LoopBack2 ip address 192.168.2.1 255.255.255.0 # interface LoopBack3 ip address 192.168.3.1 255.255.255.0 # isis 100 is-level level-2 network-entity 49.0002.0000.0000.0005.00 #

检查如下：

在R1、2、3、4、5上面进行检查

检查is-is的邻居关系是否UP

display isis peer Peer information for ISIS(100) System Id Interface Circuit Id State HoldTime Type PRI ------------------------------------------------------------------------------- 0000.0000.0002 GE0/0/0 0000.0000.0001.01 Up 22s L1 64 0000.0000.0003 GE0/0/0 0000.0000.0001.01 Up 23s L1 64 Total Peer(s): 2

查看在R1使能IS-IS的接口

display isis interface Interface information for ISIS(100) ----------------------------------- Interface Id IPV4.State IPV6.State MTU Type DIS GE0/0/0 001 Up Down 1497 L1/L2 Yes/No

第二步：其中RTA在AREA49.0001区域为DIS，RTD与RTE之间要求采用P2P网络类型

在R1的接口下面进行配置

# interface GigabitEthernet0/0/0 ip address 192.168.123.1 255.255.255.0 isis enable 100 isis dis-priority 120 level-1 #

检查R1是否为DIS

[R1]display isis interface GigabitEthernet 0/0/0 Interface information for ISIS(100) ----------------------------------- Interface Id IPV4.State IPV6.State MTU Type DIS GE0/0/0 001 Up Down 1497 L1/L2 Yes/No [R1]

RTD与RTE之间要求采用P2P网络类型

R4的配置

# interface GigabitEthernet0/0/2 isis circuit-type p2p #

R5的配置

# interface GigabitEthernet0/0/2 isis circuit-type p2p #

检查如下

[R4]display isis brief ISIS Protocol Information for ISIS(100) --------------------------------------- SystemId: 0000.0000.0004 System Level: L2 Area-Authentication-mode: NULL Domain-Authentication-mode: NULL Ipv6 is not enabled ISIS is in invalid restart status ISIS is in protocol hot standby state: Real-Time Backup Interface: 192.168.45.4(GE0/0/2) Cost: L1 10 L2 10 Ipv6 Cost: L1 10 L2 10 State: IPV4 Up IPV6 Down Type: P2P MTU: 1497 Priority: L1 64 L2 64 Timers: Csnp: L12 10 , Retransmit: L12 5 , Hello: 10 , Hello Multiplier: 3 , LSP-Throttle Timer: L12 50 Interface: 192.168.24.4(GE0/0/1) Cost: L1 10 L2 10 Ipv6 Cost: L1 10 L2 10 State: IPV4 Up IPV6 Down Type: BROADCAST MTU: 1497 Priority: L1 64 L2 64 Timers: Csnp: L1 10 L2 10 ,Retransmit: L12 5 , Hello: L1 10 L2 10 , Hello Multiplier: L1 3 L2 3 , LSP-Throttle Timer: L12 50 Interface: 192.168.34.4(GE0/0/0) Cost: L1 10 L2 10 Ipv6 Cost: L1 10 L2 10 State: IPV4 Up IPV6 Down Type: BROADCAST MTU: 1497 Priority: L1 64 L2 64 Timers: Csnp: L1 10 L2 10 ,Retransmit: L12 5 , Hello: L1 10 L2 10 , Hello Multiplier: L1 3 L2 3 , LSP-Throttle Timer: L12 50

第三步：RTE引入直连链路192.168.X.X

在R5上面进行引入直连路由

# isis 100 is-level level-2 network-entity 49.0002.0000.0000.0005.00 import-route direct #

因为非骨干区域没有到达骨干区域的路由，我们可以在R2和R3上面做重发布，把骨干区域的路由引入到非骨干区域当中

在R2上面进行配置

# isis 100 network-entity 49.0001.0000.0000.0002.00 import-route isis level-2 into level-1 #

在R3上面进行配置

# isis 100 network-entity 49.0001.0000.0000.0002.00 import-route isis level-2 into level-1 #

在R1上面检查到达骨干区域的路由情况

display ip routing-table protocol isis Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Public routing table : ISIS Destinations : 7 Routes : 12 ISIS routing table status : Destinations : 7 Routes : 12 Destination/Mask Proto Pre Cost Flags NextHop Interface 0.0.0.0/0 ISIS-L1 15 10 D 192.168.123.3 GigabitEthernet 0/0/0 ISIS-L1 15 10 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.1.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet 0/0/0 192.168.2.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet 0/0/0 192.168.3.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet 0/0/0 192.168.24.0/24 ISIS-L1 15 20 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.34.0/24 ISIS-L1 15 20 D 192.168.123.3 GigabitEthernet 0/0/0 192.168.45.0/24 ISIS-L1 15 30 D 192.168.123.2 GigabitEthernet 0/0/0 ISIS-L1 15 30 D 192.168.123.3 GigabitEthernet 0/0/0 ISIS routing table status : Destinations : 0 Routes : 0

第四步：要求RTA访问AREA49.0002走最优路径

在R3上面修改isis的开销值

# interface GigabitEthernet0/0/1 ip address 192.168.34.3 255.255.255.0 isis enable 100 isis cost 60 #

在R4上面修改isis的开销值

# interface GigabitEthernet0/0/0 ip address 192.168.34.4 255.255.255.0 isis enable 100 isis cost 60 #

在R1上面检查到达骨干区域的路由情况

display ip routing-table protocol isis Route Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Public routing table : ISIS Destinations : 7 Routes : 8 ISIS routing table status : Destinations : 7 Routes : 8 Destination/Mask Proto Pre Cost Flags NextHop Interface 0.0.0.0/0 ISIS-L1 15 10 D 192.168.123.3 GigabitEthernet 0/0/0 ISIS-L1 15 10 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.1.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.2.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.3.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.24.0/24 ISIS-L1 15 20 D 192.168.123.2 GigabitEthernet 0/0/0 192.168.34.0/24 ISIS-L1 15 70 D 192.168.123.3 GigabitEthernet 0/0/0 192.168.45.0/24 ISIS-L1 15 30 D 192.168.123.2 GigabitEthernet 0/0/0 ISIS routing table status : Destinations : 0 Routes : 0

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