码迷，mamicode.com
首页 > 其他好文 > 详细

is-is进阶实验

时间：2020-05-03 12:26:06      阅读：78      评论：0      收藏：0      [点我收藏+]

标签：height   ade   引入   做了   replicat   ica   work   pid   use   

技术图片

 

规划说明：R5的e0/0为56.1.1.5/24，lo0为5.5.5.5/32

                     R6的e0/0为56.1.1.6/24，lo0为6.6.6.6/32，依次类推。 

R5的isis类型为level-2

R6，R7的isis类型为level-2

R8的isis类型为level-1

所有互联接口和环回口都宣告进isis中，查看邻居信息，注意观察形成邻居的Type。

R5：
System Id      Type Interface   IP Address      State Holdtime Circuit Id
R6             L2   Et0/0       56.1.1.6        UP    8        R6.01              
R7             L2   Et0/1       57.1.1.7        UP    8        R7.01 
R6：
System Id      Type Interface   IP Address      State Holdtime Circuit Id
R5             L2   Et0/0       56.1.1.5        UP    27       R6.01              
R8             L1   Et0/1       68.1.1.8        UP    7        R8.01 

R7：
System Id      Type Interface   IP Address      State Holdtime Circuit Id
R5             L2   Et0/0       57.1.1.5        UP    27       R7.01              
R8             L1   Et0/1       78.1.1.8        UP    8        R8.02    
R8：
System Id      Type Interface   IP Address      State Holdtime Circuit Id
R6             L1   Et0/0       68.1.1.6        UP    20       R8.01              
R7             L1   Et0/1       78.1.1.7        UP    25       R8.02

 

查看R5到R8的环回口lo0（8.8.8.8）的路由

R5#sh ip route isis 
Codes: L - local, 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, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      6.0.0.0/32 is subnetted, 1 subnets
i L2     6.6.6.6 [115/20] via 56.1.1.6, 21:35:43, Ethernet0/0
      7.0.0.0/32 is subnetted, 1 subnets
i L2     7.7.7.7 [115/20] via 57.1.1.7, 21:30:54, Ethernet0/1
      8.0.0.0/32 is subnetted, 1 subnets
i L2     8.8.8.8 [115/30] via 57.1.1.7, 21:30:54, Ethernet0/1
                 [115/30] via 56.1.1.6, 21:30:54, Ethernet0/0
      68.0.0.0/24 is subnetted, 1 subnets
i L2     68.1.1.0 [115/20] via 56.1.1.6, 21:35:43, Ethernet0/0
      78.0.0.0/24 is subnetted, 1 subnets
i L2     78.1.1.0 [115/20] via 57.1.1.7, 21:30:54, Ethernet0/1

metric值计算=数据包的出方向或者路由的入方向度量值累加=R5 的e0/0的metric（默认为10）+R56的e0/1的metric（默认为10）+R8 的lo0的metric（默认为10）=30

上图到 8.8.8.8出现1个等价metric为30的等价负载均衡，我们可以修改metric改变选路。

具体方法：

接口模式下 isis metric metric

修改R6的e0/1下metric再看下选路情况（R8的e0/0也修改了，为了保持链路两端开销一致）

R5#sh ip route isis 
Codes: L - local, 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, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      6.0.0.0/32 is subnetted, 1 subnets
i L2     6.6.6.6 [115/20] via 56.1.1.6, 21:54:52, Ethernet0/0
      7.0.0.0/32 is subnetted, 1 subnets
i L2     7.7.7.7 [115/20] via 57.1.1.7, 21:50:03, Ethernet0/1
      8.0.0.0/32 is subnetted, 1 subnets
i L2     8.8.8.8 [115/21] via 56.1.1.6, 00:12:19, Ethernet0/0
      68.0.0.0/24 is subnetted, 1 subnets
i L2     68.1.1.0 [115/11] via 56.1.1.6, 00:12:24, Ethernet0/0
      78.0.0.0/24 is subnetted, 1 subnets
i L2     78.1.1.0 [115/20] via 57.1.1.7, 21:50:03, Ethernet0/1

R5到8.8.8.8的路由变为一条，metric为21.

 

 

将metrci的值再修改为默认的10，我们再查看R8 的database和路由

R8#sh isis database 

IS-IS Level-1 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R6.00-00              0x00000001   0x7121        665               0/0/0
R6.00-00              0x00000006   0xB757        972               1/0/0
R7.00-00              0x00000006   0xC533        972               1/0/0
R8.00-00            * 0x00000007   0x51FB        979               0/0/0
R8.01-00            * 0x00000002   0x1C25        974               0/0/0
R8.02-00            * 0x00000002   0x2E11        974               0/0/0


R8#sh ip route isis 
Codes: L - local, 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, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 78.1.1.7 to network 0.0.0.0

i*L1  0.0.0.0/0 [115/10] via 78.1.1.7, 00:00:55, Ethernet0/1
                [115/10] via 68.1.1.6, 00:00:55, Ethernet0/0
      6.0.0.0/32 is subnetted, 1 subnets
i L1     6.6.6.6 [115/20] via 68.1.1.6, 00:00:55, Ethernet0/0
      7.0.0.0/32 is subnetted, 1 subnets
i L1     7.7.7.7 [115/20] via 78.1.1.7, 00:00:55, Ethernet0/1
      56.0.0.0/24 is subnetted, 1 subnets
i L1     56.1.1.0 [115/20] via 68.1.1.6, 00:00:55, Ethernet0/0
      57.0.0.0/24 is subnetted, 1 subnets
i L1     57.1.1.0 [115/20] via 78.1.1.7, 00:00:55, Ethernet0/1

当ATT位置1的 时候产生默认路由，指向边界。查看路由表，R8去往区域外部通过默认路由，也就是说因为是level-1类型，不保存其他区域数据库。

 

设置R5，R6之间的metric为63，R6，R8之间metric为1，

R5，R7和R7，R8之间默认为10，看下R8去往R5的lo0（5.5.5.5）的选路情况

R8#sh ip route isis
Codes: L - local, 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, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 68.1.1.6 to network 0.0.0.0

i*L1  0.0.0.0/0 [115/1] via 68.1.1.6, 00:00:06, Ethernet0/0
      6.0.0.0/32 is subnetted, 1 subnets
i L1     6.6.6.6 [115/11] via 68.1.1.6, 00:00:06, Ethernet0/0
      7.0.0.0/32 is subnetted, 1 subnets
i L1     7.7.7.7 [115/20] via 78.1.1.7, 01:10:22, Ethernet0/1
      56.0.0.0/24 is subnetted, 1 subnets
i L1     56.1.1.0 [115/64] via 68.1.1.6, 00:00:06, Ethernet0/0
      57.0.0.0/24 is subnetted, 1 subnets
i L1     57.1.1.0 [115/20] via 78.1.1.7, 01:10:22, Ethernet0/1

由路由表可以看到，R8选择走R6，这形成了次优路径。

我们利用路由渗透技术，让R8学习到去往R5的5.5.5.5的明细路由

在R7上将Level-2数据库中的学习到的路由重分布到Level-1中，这样就可以传递给R8，从而R8去往R5 lo0可以优选R7这条路径

 

R7上渗透配置：

router isis
 net 49.0002.0000.0000.0007.00
 redistribute isis ip level-2 into level-1 route-map Lo0
!
ip forward-protocol nd
!
!         
no ip http server
no ip http secure-server
!
!
route-map Lo0 permit 10
 match ip address 10
!
!
access-list 10 permit 5.5.5.5

我们做了一个route-map，只将5.5.5.5这条32位主机路由洋葱Level-2引入Level-1中，查看R8上的isis路由表

R8#sh ip route isis
Codes: L - local, 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, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 68.1.1.6 to network 0.0.0.0

i*L1  0.0.0.0/0 [115/1] via 68.1.1.6, 00:28:14, Ethernet0/0
      5.0.0.0/32 is subnetted, 1 subnets
i ia     5.5.5.5 [115/158] via 78.1.1.7, 00:00:47, Ethernet0/1
      6.0.0.0/32 is subnetted, 1 subnets
i L1     6.6.6.6 [115/11] via 68.1.1.6, 00:28:14, Ethernet0/0
      7.0.0.0/32 is subnetted, 1 subnets
i L1     7.7.7.7 [115/20] via 78.1.1.7, 01:38:30, Ethernet0/1
      56.0.0.0/24 is subnetted, 1 subnets
i L1     56.1.1.0 [115/64] via 68.1.1.6, 00:28:14, Ethernet0/0
      57.0.0.0/24 is subnetted, 1 subnets
i L1     57.1.1.0 [115/20] via 78.1.1.7, 01:38:30, Ethernet0/1

R8拥有R5环回口的明细路由（R7传递通过Level-1传递过来的），就会选择R7去往5.5.5.5

 

is-is进阶实验

标签：height   ade   引入   做了   replicat   ica   work   pid   use   

原文地址：https://www.cnblogs.com/miaocongcong/p/12821179.html
踩
(0)
赞
(0)
   
举报
评论 一句话评论（0）
登录后才能评论！
分享档案
更多>
2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)
周排行
mamicode.com排行更多图片
更多
友情链接
兰亭集智   国之画   百度统计   站长统计   阿里云   chrome插件   新版天听网
关于我们 - 联系我们 - 留言反馈
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码！