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 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
<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 GigabitEthernet0/0/2
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
<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 : 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 : <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 : 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 : <Inactive>
Destinations : 0 Routes : 0