CCNP-19 IS-IS試驗2
實驗拓撲：
試驗要求：R1 R2 R3全部采用集成的ISIS路由協議，R1 R2在區域49.0001內，R3在區域49.0002內，R1與R2之間的鏈路類型為L1，R2與R3之間的鏈路類型為L2。
試驗目的：掌握基本的集成ISIS配置 實驗配置：
R1：
R1(config)#router?isis
R1(config-router)#net 49.0001.1111.1111.1111.00
R1(config-router)#is-type level-1
R1(config-router)#exit
R1(config)#int loop0
R1(config-if)#ip add?1.1.1.1 255.255.255.0
R1(config-if)#ip router?isis
R1(config-if)#exit
R1(config)#int loop1
R1(config-if)#ip add?2.2.2.2 255.255.255.0
R1(config-if)#ip router?isis
R1(config-if)#exit
R1(config)#int f0/0
R1(config-if)#ip add 199.99.1.1 255.255.255.0
R1(config-if)#ip router?isis
R1(config-if)#no shu
R1(config-if)#exit
R2：
R2(config)#router?isis
R2(config-router)#net 49.0001.2222.2222.2222.00
R2(config-router)#exit
R2(config)#int loop0
R2(config-if)#ip add?3.3.3.3 255.255.255.0
R2(config-if)#ip router?isis
R2(config-if)#exit
R2(config)#int loop1
R2(config-if)#ip add?4.4.4.4 255.255.255.0
R2(config-if)#ip router?isis
R2(config-if)#exit
R2(config)#int f0/0
R2(config-if)#ip add 199.99.1.2 255.255.255.0
R2(config-if)#ip router?isis
R2(config-if)#isis?circuit-type level-1
R2(config-if)#no shu
R2(config-if)#exit
R2(config)#int s1/0
R2(config-if)#ip add 199.99.2.1 255.255.255.0
R2(config-if)#ip router?isis
R2(config-if)#isis?circuit-type level-2-only
R2(config-if)#clock rate 64000
R2(config-if)#no shu
R2(config-if)#exit
R3：
R3(config)#router?isis
R3(config-router)#net 49.0002.3333.3333.3333.00
R3(config-router)#is-type level-2-only
R3(config-router)#exit
R3(config)#int loop0
R3(config-if)#ip add?5.5.5.5 255.255.255.0
R3(config-if)#ip router?isis
R3(config-if)#exit
R3(config)#int loop1
R3(config-if)#ip add?6.6.6.6 255.255.255.0
R3(config-if)#ip router?isis
R3(config-if)#exit
R3(config)#int s1/0
R3(config-if)#ip add 199.99.2.2 255.255.255.0
R3(config-if)#ip router?isis
R3(config-if)#no shu
R3(config-if)#exit
以上為基本的集成ISIS的配置，起Loop接口做測試，注意有一點需要提出的是，在上次試驗中我既在ISIS配置模式下配置了路由器的level，又在接口模式下配置了circuit-type的level，今天又一次看ISIS的時候發現其實這兩條命令之需要一條就可以了。OK，下面查看一下鄰居關系：
Router#show clns is-neighbors
System Id??????Interface???State??Type Priority??Circuit Id?????????Format
R2?????????Fa0/0???????Up?????L1???64????????R2.03??????????Phase V
R2#show clns is-neighbors
System Id??????Interface???State??Type Priority??Circuit Id?????????Format
R1?????????????Fa0/0???????Up?????L1???64????????R2.03??????????????Phase V
R3?????????????Se1/0???????Up?????L2???0?????????00?????????????????Phase V
R3#show clns is-neighbors
System Id??????Interface???State??Type Priority??Circuit Id?????????Format
R2?????????????Se1/0???????Up?????L2???0?????????00?????????????????Phase V
鄰居關系狀態都UP了，表示成功建立了ISIS的鄰居關系，R2.03表示在LAN環境下R2為DIS。然后我們查看一下show ip protocols：
R1#show ip protocols
Routing Protocol is "isis"
??Invalid after 0 seconds, hold down 0, flushed after 0
??Outgoing update filter list for all interfaces is not set
??Incoming update filter list for all interfaces is not set
?Redistributing:?isis
??Address Summarization:
????None
??Maximum path: 4
??Routing for Networks:
????Loopback0
????Loopback1
????FastEthernet0/0
??Routing Information Sources:
????Gateway?????????Distance??????Last Update
????3.3.3.3??????????????115??????00:00:39
??Distance: (default is 115)
R2#show ip protocols
Routing Protocol is "isis"
??Invalid after 0 seconds, hold down 0, flushed after 0
??Outgoing update filter list for all interfaces is not set
??Incoming update filter list for all interfaces is not set
??Redistributing:?isis
??Address Summarization:
????None
??Maximum path: 4
??Routing for Networks:
????Loopback0
????Loopback1
????FastEthernet0/0
????Serial1/0
??Routing Information Sources:
????Gateway?????????Distance??????Last Update
????5.5.5.5??????????????115??????00:00:11
????1.1.1.1??????????????115??????00:00:06
??Distance: (default is 115)
R3#show ip protocols
Routing Protocol is "isis"
??Invalid after 0 seconds, hold down 0, flushed after 0
??Outgoing update filter list for all interfaces is not set
??Incoming update filter list for all interfaces is not set
??Redistributing:?isis
??Address Summarization:
????None
??Maximum path: 4
??Routing for Networks:
????Loopback0
????Loopback1
????Serial1/0
??Routing Information Sources:
????Gateway?????????Distance??????Last Update
????3.3.3.3??????????????115??????00:00:11
?????Distance: (default is 115)
從上面的信息可以看到集成ISIS的一些信息，注意Gateway顯示的是loopback0的地址，ISIS的管理距離為115，為什么會選用這個地址？會不會像OSPF選取router-id一樣呢？我們做一下測試：
R3(config)#int loop2
R3(config-if)#ip add?1.1.2.1 255.255.255.0
R3(config-if)#ip router?isis
R3(config-if)#end
在R3上再起一個loopback接口，IP地址要小于loopback0的IP地址，然后在R2上clear isis *后，在show ip procols查看：
R2#show ip protocols
Routing Protocol is "isis"
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing:?isis
Address Summarization:
None
Maximum path: 4
Routing for Networks:
Loopback0
Loopback1
FastEthernet0/0
Serial1/0
Routing Information Sources:
?Gateway?????????Distance??????Last Update
????5.5.5.5??????????????115??????00:00:00
????1.1.1.1??????????????115??????00:00:22
Distance: (default is 115)
沒有任何變化，好的，下面我們把R3的loopback0接口地址做一下修改：
R3(config)#int loop0
R3(config-if)#ip add?1.1.3.1 255.255.255.0
R3(config-if)#end
這回再到R2上show ip procols時會發現變化：
R2#show ip protocols
Routing Protocol is "isis"
Invalid after 0 seconds, hold down 0, flushed after 0
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing:?isis
Address Summarization:
None
Maximum path: 4
Routing for Networks:
Loopback0
Loopback1
FastEthernet0/0
Serial1/0
Routing Information Sources:
??Gateway?????????Distance??????Last Update
????5.5.5.5??????????????115??????00:00:28
????1.1.1.1??????????????115??????00:00:02
????1.1.3.1??????????????115??????00:00:02
Distance: (default is 115)
多了一個1.1.3.1的地址，表示采用了新的R3 Loopback0接口地址，5.5.5.5的地址還在，并沒有消除，等鄰居計時器超時后就會消除的。由此我們可以判斷出這里顯示的地址為相鄰路由器loopback0口的IP地址。
下面我們來查看一下LSDB：
R1#show?isis?database
IS-IS Level-1?Link?State?Database:
LSPID?????????????????LSP Seq Num??LSP Checksum??LSP Holdtime??????ATT/P/OL
R1.00-00????????????* 0x00000004???0x0170????????1086??????????????0/0/0
R2.00-00??????????????0x00000007???0x9E4A????????1114??????????????1/0/0
R2.03-00??????????????0x00000001???0x183C????????1040??????????????0/0/0
R2#show?isis?database
IS-IS Level-1?Link?State?Database:
LSPID?????????????????LSP Seq Num??LSP Checksum??LSP Holdtime??????ATT/P/OL
R1.00-00??????????????0x00000004???0x0170????????1162??????????????0/0/0
R2.00-00????????????* 0x00000007???0x9E4A????????1195??????????????1/0/0
R2.03-00????????????* 0x00000001???0x183C????????1120??????????????0/0/0
IS-IS Level-2?Link?State?Database:
LSPID?????????????????LSP Seq Num??LSP Checksum??LSP Holdtime??????ATT/P/OL
R2.00-00????????????* 0x0000000A???0x43B5????????1189??????????????0/0/0
R3.00-00??????????????0x00000002???0x2F4C????????1187??????????????0/0/0
R3#show?isis?database
IS-IS Level-2?Link?State?Database:
LSPID?????????????????LSP Seq Num??LSP Checksum??LSP Holdtime??????ATT/P/OL
R2.00-00??????????????0x0000000A???0x43B5????????1189??????????????0/0/0
R3.00-00????????????* 0x00000002???0x2F4C????????1191??????????????0/0/0
這里可以看到在LAN環境下，R2后面的ATT為1,表示它為一個邊界路由器，R2.03-00表示R2為DIS。最后我們來查看一下路由表：
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -?OSPF,?IA?- OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 199.99.1.2 to network?0.0.0.0
1.0.0.0/24 is subnetted, 1 subnets
C???????1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
C???????2.2.2.0 is directly connected, Loopback1
????3.0.0.0/24 is subnetted, 1 subnets
i L1????3.3.3.0 [115/20] via 199.99.1.2, FastEthernet0/0
?????4.0.0.0/24 is subnetted, 1 subnets
i L1????4.4.4.0 [115/20] via 199.99.1.2, FastEthernet0/0
C????199.99.1.0/24 is directly connected, FastEthernet0/0
i*L1?0.0.0.0/0 [115/10] via 199.99.1.2, FastEthernet0/0
R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -?OSPF,?IA?- OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
?????1.0.0.0/24 is subnetted, 3 subnets
i L1????1.1.1.0 [115/20] via 199.99.1.1, FastEthernet0/0
i L2????1.1.2.0 [115/20] via 199.99.2.2, Serial1/0
i L2????1.1.3.0 [115/20] via 199.99.2.2, Serial1/0
?????2.0.0.0/24 is subnetted, 1 subnets
i L1????2.2.2.0 [115/20] via 199.99.1.1, FastEthernet0/0
3.0.0.0/24 is subnetted, 1 subnets
C???????3.3.3.0 is directly connected, Loopback0
4.0.0.0/24 is subnetted, 1 subnets
C???????4.4.4.0 is directly connected, Loopback1
???6.0.0.0/24 is subnetted, 1 subnets
i L2????6.6.6.0 [115/20] via 199.99.2.2, Serial1/0
C????199.99.2.0/24 is directly connected, Serial1/0
C????199.99.1.0/24 is directly connected, FastEthernet0/0
R3#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -?OSPF,?IA?- OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
?????1.0.0.0/24 is subnetted, 3 subnets
i L2????1.1.1.0 [115/30] via 199.99.2.1, Serial1/0
C???????1.1.2.0 is directly connected, Loopback2
C???????1.1.3.0 is directly connected, Loopback0
?????2.0.0.0/24 is subnetted, 1 subnets
i L2????2.2.2.0 [115/30] via 199.99.2.1, Serial1/0
?????3.0.0.0/24 is subnetted, 1 subnets
i L2????3.3.3.0 [115/20] via 199.99.2.1, Serial1/0
?????4.0.0.0/24 is subnetted, 1 subnets
i L2????4.4.4.0 [115/20] via 199.99.2.1, Serial1/0
6.0.0.0/24 is subnetted, 1 subnets
C???????6.6.6.0 is directly connected, Loopback1
C????199.99.2.0/24 is directly connected, Serial1/0
i L2 199.99.1.0/24 [115/20] via 199.99.2.1, Serial1/0
上面用紅顏色標記的部分表示都是通過ISIS學習到的，I L1表示的是LEVEL-1路由，I L2表示的是LEVEL-2的路由，I*L1表示的是缺省路由，下面在R1上ping測試一下：
R1#ping 199.99.2.2
?
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 199.99.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 168/191/216 ms
通了。 實驗總結：掌握基本的集成ISIS配置方法，并會使用show命令對集成ISIS的配置進行檢驗。
本文轉自loveme2351CTO博客，原文鏈接：http://blog.51cto.com/loveme23/47989?，如需轉載請自行聯系原作者
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