mirror of
https://github.com/gnu4cn/ccna60d.git
synced 2024-05-21 04:55:00 +08:00
update
This commit is contained in:
54
d36-EIGRP.md
54
d36-EIGRP.md
@@ -527,4 +527,56 @@ Fa0/0 1 0/0 1 0/1 50 0
|
||||
|
||||
在EIGRP网络中,静态邻居关系的使用是十分罕见的。这主要是因为手动邻居配置在大型网络中无法适应其规模。但重要的是明白在思考IOS软件中为何还是有此选项,以及在什么情况下可以运用到此特性。使用静态邻居配置的一个主要实例,就是在那些没有广播或多播数据原生支持的传输介质,比如帧中继上,部署EIGRP的情况下(A prime example of when static neighbour configuration could be used would be in a situation where EIGRP is being deployed across media that does not natively support Broadcast or Multicast packets, such as Frame Relay)。
|
||||
|
||||
另一实例就是,为了在多路访问网络,比如以太网上,仅有少数几台开启了EIGRP的路由器时,为了防止发送不必要的EIGRP数据包的情形。在此情况下,除开基本的EIGRP配置,还必须在本地路由器上对所有静态EIGRP邻居配置`neighbour`命令。如果一台路由器被配置为使用单播(静态),而其它路由器又被配置为使用多播(动态),那么这些开启了EIGRP的路由器是不会建立邻接关系的(EIGRP-enabled routers will not establish an adjacency if one router is configured to use Unicast(static) while another uses Multicast(dynamic))。
|
||||
另一实例就是,为了在多路访问网络,比如以太网上,仅有少数几台开启了EIGRP的路由器时,为了防止发送不必要的EIGRP数据包的情形。在此情况下,除开基本的EIGRP配置,还必须在本地路由器上对**所有**静态EIGRP邻居配置`neighbour`命令。如果一台路由器被配置为使用单播(静态),而其它路由器又被配置为使用多播(动态),那么这些开启了EIGRP的路由器是不会建立邻接关系的(EIGRP-enabled routers will not establish an adjacency if one router is configured to use Unicast(static) while another uses Multicast(dynamic))。
|
||||
|
||||
在思科IOS软件中,静态EIGRP的邻居,是通过使用路由器配置命令(router configuration command)`neighbour <address> <interface>`进行配置的。记住**这只是简单的对基础EIGRP配置的增加**(this is simply in addition to the basic EIGRP configuration)。下图36.5中给出的简单网络拓扑,将用于静态EIGRP邻居的演示和验证。
|
||||
|
||||

|
||||
*图 36.5 -- 配置静态的EIGRP邻居*
|
||||
|
||||
参考图36.5中所给出的拓扑,路由器R2将作如下配置:
|
||||
|
||||
```
|
||||
R2(config)#router eigrp 150
|
||||
R2(config-router)#network 192.168.1.0 0.0.0.255
|
||||
R2(config-router)#neighbor 192.168.1.3 FastEthernet0/0
|
||||
R2(config-router)#no auto-summary
|
||||
R2(config-router)#exit
|
||||
```
|
||||
|
||||
而应用于路由器R3上的配置则如下:
|
||||
|
||||
```
|
||||
R3(config)#router eigrp 150
|
||||
R3(config-router)#network 192.168.1.0 0.0.0.255
|
||||
R3(config-router)#neighbor 192.168.1.2 FastEthernet0/0
|
||||
R3(config-router)#no auto-summary
|
||||
R3(config-router)#exit
|
||||
```
|
||||
|
||||
可使用`show ip eigrp interfaces detail <name>`命令,对路由器接口使用多播(动态),还是使用单播(静态)数据包来进行邻居发现与维护进行判断。下面的输出对此进行了演示:
|
||||
|
||||
```
|
||||
R2#show ip eigrp interfaces detail FastEthernet0/0
|
||||
IP-EIGRP interfaces for process 150
|
||||
Xmit Queue Mean Pacing Time Multicast Pending
|
||||
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
|
||||
Fa0/0 1 0/0 2 0/1 50 0
|
||||
|
||||
Hello interval is 5 sec
|
||||
Next xmit serial <none>
|
||||
Un/reliable mcasts: 0/1 Un/reliable ucasts: 3/8
|
||||
Mcast exceptions: 1 CR packets: 1 ACKs suppressed: 2
|
||||
Retransmissions sent: 1 Out-of-sequence rcvd: 0
|
||||
Authentication mode is not set
|
||||
Use unicast
|
||||
```
|
||||
|
||||
此外,可使用`show ip eigrp neighbours [detail]`命令来判断EIGRP邻居的类型。在本课程模块的后面将对此命令进行详细讲解。
|
||||
|
||||
###EIGRP的Hello及保持计时器
|
||||
|
||||
**EIGRP Hello and Hold Timers**
|
||||
|
||||
|
||||
|
||||
|
||||
BIN
images/3605.png
Normal file
BIN
images/3605.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 135 KiB |
Reference in New Issue
Block a user