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
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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
RT1：49.0001.0000.0000.0001.00
RT2：49.0001.0000.0000.0002.00
RT3：49.0001.0000.0000.0003.00
RT4：49.0002.0000.0000.0004.00
RT5：49.0002.0000.0000.0005.00
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 100network-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 100network-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
<R1>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
<R1>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 <R1>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 GigabitEthernet0/0/2isis circuit-type p2p#R5的配置
#interface GigabitEthernet0/0/2isis 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: NULLDomain-Authentication-mode: NULLIpv6 is not enabledISIS is in invalid restart statusISIS is in protocol hot standby state: Real-Time BackupInterface: 192.168.45.4(GE0/0/2)Cost: L1 10 L2 10 Ipv6 Cost: L1 10 L2 10 State: IPV4 Up IPV6 DownType: 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 DownType: 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 DownType: 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
<R1>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 : <Active> Destinations : 7 Routes : 12Destination/Mask Proto Pre Cost Flags NextHop Interface 0.0.0.0/0 ISIS-L1 15 10 D 192.168.123.3 GigabitEthernet0/0/0 ISIS-L1 15 10 D 192.168.123.2 GigabitEthernet0/0/0 192.168.1.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet0/0/0 192.168.2.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet0/0/0 192.168.3.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 ISIS-L1 15 94 D 192.168.123.3 GigabitEthernet0/0/0 192.168.24.0/24 ISIS-L1 15 20 D 192.168.123.2 GigabitEthernet0/0/0 192.168.34.0/24 ISIS-L1 15 20 D 192.168.123.3 GigabitEthernet0/0/0 192.168.45.0/24 ISIS-L1 15 30 D 192.168.123.2 GigabitEthernet0/0/0 ISIS-L1 15 30 D 192.168.123.3 GigabitEthernet0/0/0ISIS routing table status : <Inactive> 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
<R1>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 : <Active> Destinations : 7 Routes : 8Destination/Mask Proto Pre Cost Flags NextHop Interface 0.0.0.0/0 ISIS-L1 15 10 D 192.168.123.3 GigabitEthernet0/0/0 ISIS-L1 15 10 D 192.168.123.2 GigabitEthernet0/0/0 192.168.1.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 192.168.2.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 192.168.3.0/24 ISIS-L1 15 94 D 192.168.123.2 GigabitEthernet0/0/0 192.168.24.0/24 ISIS-L1 15 20 D 192.168.123.2 GigabitEthernet0/0/0 192.168.34.0/24 ISIS-L1 15 70 D 192.168.123.3 GigabitEthernet0/0/0 192.168.45.0/24 ISIS-L1 15 30 D 192.168.123.2 GigabitEthernet0/0/0ISIS routing table status : <Inactive> Destinations : 0 Routes : 0