HCNA－RIP定时器

１、拓扑图

2、

1.RIP有哪些定时器？
三种：更新定时器、老化定时器、垃圾回收定时器

2.RIP的定时器有哪些作用？
更新定时器（30s）：运行RIP的路由器会以30s为周期，向邻居发送RIP路由。
老化定时器（180s）：当路由器在180s内没有收到一条RIP路由的更新，那么路由器会认为这条RIP路由已经失效。
垃圾回收定时器（120s）：当路由器被设置为失效后，不会被立即删除，需要再等待120s才会被彻底删除。

3.为什么RIP需要周期性的发送路由？
因为RIP基于UDP发送协议报文，而UDP没有确认机制，所以路由器将路由发送出去以后不能得知邻居是否收到了RIP路由。
为了保障路由的可靠更新，只有让路由器周期性的发送RIP路由，这样从概率上来说能够保证邻居路由器一定可以学习到RIP路由。
方法

.配置接口IP

.配置RIP协议

.查看RIP定时器:
[R1]display rip

.修改RIP定时器：
[R1]rip
[R1-rip-]timers rip
[R1-rip-]quit

.再次查看RIP定时器：
[R1]display rip

R1

Please press enter to start cmd line!
################################################################################
######################
<Huawei>sys
Enter system view, return user view with Ctrl+Z.
[Huawei]dis rip
[Huawei]dis rip
[Huawei]sysname
[Huawei]sysname R1
[R1]int
[R1]interface g0//
[R1-GigabitEthernet0//]ip add 12.1.1.1
[R1-GigabitEthernet0//]q
[R1]rip
[R1-rip-]ne
[R1-rip-]network 12.0.0.0
[R1-rip-]q
[R1]dis rip
[R1]dis rip
Public VPN-instance
    RIP process :
       RIP version   :
       Preference    :
       Checkzero     : Enabled
       Default-cost  :
       Summary       : Enabled
       Host-route    : Enabled
       Maximum number of balanced paths :
       Update time   :  sec              Age time :  sec
       Garbage-collect time :  sec
       Graceful restart  : Disabled
       BFD               : Disabled
       Silent-interfaces : None
       Default-route : Disabled
       Verify-source : Enabled
       Networks :
       12.0.0.0
       Configured peers             : None
       Number of routes in database :
       Number of interfaces enabled :
       Triggered updates sent       :
       Number of route changes      :
       Number of replies to queries :
       Number of routes in ADV DB   : 

  Total count for  process :
       Number of routes in database :
       Number of interfaces enabled :
       Number of routes sendable in a periodic update :
       Number of routes sent in last periodic update :
[R1]
[R1]
[R1]rip
[R1-rip-]tim
[R1-rip-]timers
                   ^
Error: Unrecognized command found at '^' position.
[R1-rip-]tim
[R1-rip-]timers rip
[R1-rip-]timers rip
[R1-rip-]q
[R1]dis rip
[R1]dis rip
Public VPN-instance
    RIP process :
       RIP version   :
       Preference    :
       Checkzero     : Enabled
       Default-cost  :
       Summary       : Enabled
       Host-route    : Enabled
       Maximum number of balanced paths :
       Update time   :  sec              Age time :  sec
       Garbage-collect time :  sec
       Graceful restart  : Disabled
       BFD               : Disabled
       Silent-interfaces : None
       Default-route : Disabled
       Verify-source : Enabled
       Networks :
       12.0.0.0
       Configured peers             : None
       Number of routes in database :
       Number of interfaces enabled :
       Triggered updates sent       :
       Number of route changes      :
       Number of replies to queries :
       Number of routes in ADV DB   : 

  Total count for  process :
       Number of routes in database :
       Number of interfaces enabled :
       Number of routes sendable in a periodic update :
       Number of routes sent in last periodic update :
[R1]
[R1]
[R1]

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