IS-IS DIS选举示例

组网需求

1. 广播网中有4台路由器通过IS-IS路由协议实现互联
2. Router A和Router B 是Level-1-2路由器 Router C是Level-1路由器，Router D是Level-2路由器
3. 要求将Router A配置为Level-2的DIS路由器

配置思路

1. 基本配置以及IP地址
2. 配置IS-IS协议
3. 配置接口使能IS-IS协议
4. 配置Router A为Level-2 的DIS路由器

配置

1. 基本配置以及IP地址

   • Router A配置

     sys
     sys Router A-L1-L2
     int g0/0/0
       ip add 10.1.1.1 29

• Router B配置

  sys
  sys Router B-L1-L2
  int g0/0/0
    ip add 10.1.1.2 29

• Router C配置

  sys
  sys Router C-L1
  int g0/0/0
    ip add 10.1.1.3 29

• Router D配置

  sys
  sys Router D-L2
  int g0/0/0
    ip add 10.1.1.4 29

2. 配置IS-IS协议

   • Router A配置

     sys
     isis 1
       is-level level-1-2
       network-entity 10.0100.0100.1001.00

• Router B配置

  sys
  isis 1
    is-level level-1-2
    network-entity 10.0100.0100.1002.00

• Router C配置

  sys
  isis 1
    is-level level-1
    network-entity 10.0100.0100.1003.00

• Router D配置

  sys
  isis 1
    is-level level-2
    network-entity 10.0100.0100.1004.00

3. 接口使能IS-IS协议

   • Router A配置

     sys
     int g0/0/0
       isis enable 1
       isis small-hello

• Router B配置

  sys
  int g0/0/0
    isis enable 1
    isis small-hello

• Router C配置

  sys
  int g0/0/0
    isis enable 1
    isis small-hello

• Router D配置

  sys
  int g0/0/0
    isis enable 1
    isis small-hello

4. 配置Router A为Level-2的DIS路由器

   sys
   int g0/0/0
     isis dr-priority 100 #默认为64

5. 查看命令

   • 查看接口MAC地址

     dis arp int g0/0/0
     
     IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE 
                                               VLAN/CEVLAN PVC                      
     ------------------------------------------------------------------------------
     10.1.1.1        00e0-fc4f-6a14            I -         GE0/0/0
     10.1.1.2        00e0-fc06-0c0e  19        D-0         GE0/0/0
     10.1.1.3        00e0-fcfb-771a  16        D-0         GE0/0/0
     10.1.1.4        00e0-fc65-6ac3  19        D-0         GE0/0/0
     ------------------------------------------------------------------------------
     Total:4         Dynamic:3       Static:0     Interface:1

• 查看IS-IS邻居信息（可以知道邻居的优先级）

  dis isis peer
  
                            Peer information for ISIS(1)
  
    System Id     Interface          Circuit Id       State HoldTime Type     PRI
  -------------------------------------------------------------------------------
  0100.0100.1002  GE0/0/0            0100.0100.1001.01 Up   21s      L1(L1L2) 64 
  0100.0100.1003  GE0/0/0            0100.0100.1001.01 Up   27s      L1       64 
  0100.0100.1002  GE0/0/0            0100.0100.1001.01 Up   30s      L2(L1L2) 64 
  0100.0100.1004  GE0/0/0            0100.0100.1001.01 Up   29s      L2       64 
  
  Total Peer(s): 4

• 查看IS-IS接口信息

  dis isis interface
  
                        Interface information for ISIS(1)
                         ---------------------------------
   Interface       Id      IPV4.State          IPV6.State      MTU  Type  DIS   
   GE0/0/0         001         Up                 Down         1497 L1/L2 Yes/Yes