IS-IS在Gns3上的配置实验
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!
R4配置文件摘要：
hostname R4
!
clns routing
!
interface Serial1/0
no ip address
serial restart-delay 0
clns router isis
!
interface Serial1/1
no ip address
serial restart-delay 0
Success rate is 100 percent (5/5), round-trip min/avg/max = 864/879/920 ms
R3#
三、
（1）R3发现目标地址的前缀49.0002与自己的前缀不同，因此R3将数据流发到最近的L1/L2 ABR，即R4。R3使用L1拓扑数据库找到前往R4的最佳路径,R3没有使用目标系统ID。
R4 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
R4 --
R5 10 R5 Se1/1 *HDLC*
R4#
R5#showisistopology
//只有到level-2路由器的路径。R5开启了level2，所以可以获悉其他区域的拓扑，但前提是其他区域和R5对接的路由器的接口也开启了level2
R4 --
R5 10 R5 Se1/1 *HDLC*
R4#
R4#show clns route
Codes: C - connected, S - static, d - DecnetIV
I - ISO-IGRP, i - IS-IS, e - ES-IS
B - BGP, b - eBGP-neighbor
IS-IS配置实验(for clns,no ip)
一、配置
R3配置文件摘要：
hostname R3
!
clns routing //先全局启用CLNS路由选择
!
interface Serial1/1
no ip address
serial restart-delay 0
clns router isis //再在接口上启用CLNS路由选择
*Jun 18 12:39:15.659: to 49.0002.0000.0000.0005.00
*Jun 18 12:39:15.663: via R5 (Serial1/1 *HDLC*)
*Jun 18 12:39:16.139: CLNS: Forwarding packet size 142
*Jun 18 12:39:16.139: from 49.0002.0000.0000.0005.00
*Jun 18 12:39:16.139: to 49.0001.0000.0000.0003.00
*Jun 18 12:39:16.143: via R3 (Serial1om 49.0001.0000.0000.0003.00
*Jun 18 12:39:19.111: CLNS: Originating packet, size 137
*Jun 18 12:39:19.115: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
R5#debug clns packets
CLNS packets debugging is on
R5#
*Jun 18 12:39:16.439: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:16.439: CLNS: Originating packet, size 137
R3#showisistopology
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 --
R4 10 R4 Se1/1 *HDLC*
（2）R4使用其L2拓扑数据库选取前缀49.0002的最佳下一跳，R4没有使用目标系统ID。
isis circuit-type level-1 //在接口中修改电路级别为L1，默认所有级别全开
!
router isis //启用ISIS路由协议，配置NET地址；NET地址由区域地址(49.0001)、系统ID(0000.0000.0003)和NSEL(00)组成
net 49.0001.0000.0000.0003.00
clns router isis
!
router isis
net 49.0001.0000.0000.0004.00
!
R5配置文件摘要：
hostname R5
!
clns routing
!
interface Serial1/0
no ip address
serial restart-delay 0
clns router isis
*Jun 18 12:39:18.187: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:19.111: CLNS: Echo PDU received on Serial1/0 len 105
Manual area address(es):
49.0001
Routing for area address(es):
49.0001
Interfaces supported by IS-IS:
Serial1/1 - OSI
Redistribute:
static (on by default)
Distance for L2 CLNS routes: 110
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:18.183: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:18.183: CLNS: Originating packet, size 137
R3#show clns route
Codes: C - connected, S - static, d - DecnetIV
I - ISO-IGRP, i - IS-IS, e - ES-IS
B - BGP, b - eBGP-neighbor
C 49.0001.0000.0000.0003.00 [1/0], Local IS-IS NET
R3 --
R3#
R4#showisistopology
//既有到level-1路由器的路径，也有到level-2路由器的路径
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 10 R3 Se1/0 *HDLC*
C 49.0001 [2/0], Local IS-IS Area
R3#ping 49.0002.0000.0000.0005.00
Type escape sequence to abort.
Sending 5, 100-byte CLNS Echos with timeout 2 seconds
!!!!!
R5 --
R5#
六、查看各路由器的
// L1/L2 IS根据区域地址将分组转发给LI/L2或L2；在目标区域内，IS根据系统ID沿最佳路径转发分组
R3#show clns protocol
IS-IS Router: <Null Tag>
System Id: 0000.0000.0003.00 IS-Type: level-1-2
四、
R4#debug clns packets
CLNS packets debugging is on
R4#
*Jun 18 12:39:15.659: CLNS: Forwarding packet size 105
*Jun 18 12:39:15.659: from 49.0001.0000.0000.0003.00
RRR level: none
Generate narrow metrics: level-1-2
*Jun 18 12:39:19.999: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
R5#
五、比较
R3#showisistopology
//只有到level-1路由器的路径。R3只开启level1，所以只能获悉当前区域(49.0001)的拓扑
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R5 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
R4 10 R4 Se1/0 *HDLC*
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 --
R4 10 R4 Se1/1 *HDLC*
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:19.995: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:19.995: CLNS: Originating packet, size 137
*Jun 18 12:39:16.443: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:17.319: CLNS: Echo PDU received on Serial1/0 len 105
isis circuit-type level-2 //在接口中修改电路级别为L2，默认所有级别全开
!
router isis
net 49.0002.0000.0000.0005.00
!
-----------------------------------------------------
二、配置完成后
R4#showisistopology
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 10 R3 Se1/0 *HDLC*
R4 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
C 49.0001.0000.0000.0004.00 [1/0], Local IS-IS NET
C 49.0001 [2/0], Local IS-IS Area
i 49.0002 [110/10]
via R5, Serial1/1
R4#
（3）R5发现目标地址的前缀49.0002与自己的前缀相同，使用目标系统ID（0000.0000.0005）查找最佳路由。
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:17.319: CLNS: Originating packet, size 137
*Jun 18 12:39:17.323: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
R4配置文件摘要：
hostname R4
!
clns routing
!
interface Serial1/0
no ip address
serial restart-delay 0
clns router isis
!
interface Serial1/1
no ip address
serial restart-delay 0
Success rate is 100 percent (5/5), round-trip min/avg/max = 864/879/920 ms
R3#
三、
（1）R3发现目标地址的前缀49.0002与自己的前缀不同，因此R3将数据流发到最近的L1/L2 ABR，即R4。R3使用L1拓扑数据库找到前往R4的最佳路径,R3没有使用目标系统ID。
R4 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
R4 --
R5 10 R5 Se1/1 *HDLC*
R4#
R5#showisistopology
//只有到level-2路由器的路径。R5开启了level2，所以可以获悉其他区域的拓扑，但前提是其他区域和R5对接的路由器的接口也开启了level2
R4 --
R5 10 R5 Se1/1 *HDLC*
R4#
R4#show clns route
Codes: C - connected, S - static, d - DecnetIV
I - ISO-IGRP, i - IS-IS, e - ES-IS
B - BGP, b - eBGP-neighbor
IS-IS配置实验(for clns,no ip)
一、配置
R3配置文件摘要：
hostname R3
!
clns routing //先全局启用CLNS路由选择
!
interface Serial1/1
no ip address
serial restart-delay 0
clns router isis //再在接口上启用CLNS路由选择
*Jun 18 12:39:15.659: to 49.0002.0000.0000.0005.00
*Jun 18 12:39:15.663: via R5 (Serial1/1 *HDLC*)
*Jun 18 12:39:16.139: CLNS: Forwarding packet size 142
*Jun 18 12:39:16.139: from 49.0002.0000.0000.0005.00
*Jun 18 12:39:16.139: to 49.0001.0000.0000.0003.00
*Jun 18 12:39:16.143: via R3 (Serial1om 49.0001.0000.0000.0003.00
*Jun 18 12:39:19.111: CLNS: Originating packet, size 137
*Jun 18 12:39:19.115: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
R5#debug clns packets
CLNS packets debugging is on
R5#
*Jun 18 12:39:16.439: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:16.439: CLNS: Originating packet, size 137
R3#showisistopology
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 --
R4 10 R4 Se1/1 *HDLC*
（2）R4使用其L2拓扑数据库选取前缀49.0002的最佳下一跳，R4没有使用目标系统ID。
isis circuit-type level-1 //在接口中修改电路级别为L1，默认所有级别全开
!
router isis //启用ISIS路由协议，配置NET地址；NET地址由区域地址(49.0001)、系统ID(0000.0000.0003)和NSEL(00)组成
net 49.0001.0000.0000.0003.00
clns router isis
!
router isis
net 49.0001.0000.0000.0004.00
!
R5配置文件摘要：
hostname R5
!
clns routing
!
interface Serial1/0
no ip address
serial restart-delay 0
clns router isis
*Jun 18 12:39:18.187: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:19.111: CLNS: Echo PDU received on Serial1/0 len 105
Manual area address(es):
49.0001
Routing for area address(es):
49.0001
Interfaces supported by IS-IS:
Serial1/1 - OSI
Redistribute:
static (on by default)
Distance for L2 CLNS routes: 110
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:18.183: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:18.183: CLNS: Originating packet, size 137
R3#show clns route
Codes: C - connected, S - static, d - DecnetIV
I - ISO-IGRP, i - IS-IS, e - ES-IS
B - BGP, b - eBGP-neighbor
C 49.0001.0000.0000.0003.00 [1/0], Local IS-IS NET
R3 --
R3#
R4#showisistopology
//既有到level-1路由器的路径，也有到level-2路由器的路径
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 10 R3 Se1/0 *HDLC*
C 49.0001 [2/0], Local IS-IS Area
R3#ping 49.0002.0000.0000.0005.00
Type escape sequence to abort.
Sending 5, 100-byte CLNS Echos with timeout 2 seconds
!!!!!
R5 --
R5#
六、查看各路由器的
// L1/L2 IS根据区域地址将分组转发给LI/L2或L2；在目标区域内，IS根据系统ID沿最佳路径转发分组
R3#show clns protocol
IS-IS Router: <Null Tag>
System Id: 0000.0000.0003.00 IS-Type: level-1-2
四、
R4#debug clns packets
CLNS packets debugging is on
R4#
*Jun 18 12:39:15.659: CLNS: Forwarding packet size 105
*Jun 18 12:39:15.659: from 49.0001.0000.0000.0003.00
RRR level: none
Generate narrow metrics: level-1-2
*Jun 18 12:39:19.999: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
R5#
五、比较
R3#showisistopology
//只有到level-1路由器的路径。R3只开启level1，所以只能获悉当前区域(49.0001)的拓扑
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R5 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
R4 10 R4 Se1/0 *HDLC*
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 --
R4 10 R4 Se1/1 *HDLC*
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:19.995: CLNS: Echo PDU received on Serial1/0 len 105
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:19.995: CLNS: Originating packet, size 137
*Jun 18 12:39:16.443: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00
via 0000.0000.0004 (Serial1/0 *HDLC*)
*Jun 18 12:39:17.319: CLNS: Echo PDU received on Serial1/0 len 105
isis circuit-type level-2 //在接口中修改电路级别为L2，默认所有级别全开
!
router isis
net 49.0002.0000.0000.0005.00
!
-----------------------------------------------------
二、配置完成后
R4#showisistopology
IS-IS paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
R3 10 R3 Se1/0 *HDLC*
R4 --
IS-IS paths to level-2 routers
System Id Metric Next-Hop Interface SNPA
C 49.0001.0000.0000.0004.00 [1/0], Local IS-IS NET
C 49.0001 [2/0], Local IS-IS Area
i 49.0002 [110/10]
via R5, Serial1/1
R4#
（3）R5发现目标地址的前缀49.0002与自己的前缀相同，使用目标系统ID（0000.0000.0005）查找最佳路由。
from 49.0001.0000.0000.0003.00
*Jun 18 12:39:17.319: CLNS: Originating packet, size 137
*Jun 18 12:39:17.323: from 49.0002.0000.0000.0005.00
to 49.0001.0000.0000.0003.00