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关于HSRP的疑问

suzhouxiaoniu
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HSRP官方有这么一句话
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但是在实验中,即使是3台路由器做HSRP,也是一台主,一台备,另外一台是处于监听状态
官方所说的,可以纯在多台备用路由器是什么意思呢?
实验现象做不出来
当然其他地方的文件
也有说只能有一个备用路由器的
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1 个已接受解答

已接受的解答

Mansur
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最多就是一台standby……其他设备是listen。http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a91.shtml
Using HSRP, a set of routers works in concert to present the illusion of a single virtual router to the hosts on the LAN. This set is known as an HSRP group or a standby group. A single router elected from the group is responsible for forwarding the packets that hosts send to the virtual router. This router is known as the Active router. Another router is elected as the Standby router. In the event that the Active router fails, the Standby assumes the packet-forwarding duties of the Active router. Although an arbitrary number of routers may run HSRP, only the Active router forwards the packets sent to the virtual router.
To minimize network traffic, only the Active and Standby routers send periodic HSRP messages once the protocol has completed the election process. If the Active router fails, the Standby router takes over as the Active router. If the Standby router fails or becomes the Active router, then another router is elected as the Standby router.
On a particular LAN, multiple hot standby groups may coexist and overlap. Each standby group emulates a single virtual router. The individual routers may participate in multiple groups. In this case, the router maintains separate state and timers for each group.
Each standby group has a single, well-known MAC address, as well as an IP address.

在原帖中查看解决方案

8 条回复8

Mansur
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最多就是一台standby……其他设备是listen。http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a91.shtml
Using HSRP, a set of routers works in concert to present the illusion of a single virtual router to the hosts on the LAN. This set is known as an HSRP group or a standby group. A single router elected from the group is responsible for forwarding the packets that hosts send to the virtual router. This router is known as the Active router. Another router is elected as the Standby router. In the event that the Active router fails, the Standby assumes the packet-forwarding duties of the Active router. Although an arbitrary number of routers may run HSRP, only the Active router forwards the packets sent to the virtual router.
To minimize network traffic, only the Active and Standby routers send periodic HSRP messages once the protocol has completed the election process. If the Active router fails, the Standby router takes over as the Active router. If the Standby router fails or becomes the Active router, then another router is elected as the Standby router.
On a particular LAN, multiple hot standby groups may coexist and overlap. Each standby group emulates a single virtual router. The individual routers may participate in multiple groups. In this case, the router maintains separate state and timers for each group.
Each standby group has a single, well-known MAC address, as well as an IP address.

suzhouxiaoniu
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本帖最后由 suzhouxiaoniu 于 2016-12-21 15:17 编辑
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这道题的答案是AB,问了很多人,都说是AB,但是都没验证过,

one-time
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suzhouxiaoniu 发表于 2016-12-21 12:53

感谢您的提问!:)稍后会有小伙伴为您解答的!:)

suzhouxiaoniu
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maguanghua2013 发表于 2016-12-21 14:44
最多就是一台standby……其他设备是listen。http://www.cisco.com/en/US/tech/tk648/tk362/technologies_te ...

这段话我看过了,Another router is elected as the Standby router.
没说备用路由器最多就一台吧

Mansur
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suzhouxiaoniu 发表于 2016-12-21 15:15
这段话我看过了,Another router is elected as the Standby router.
没说备用路由器最多就一台吧

这句是没说,下面说了。
only the Active and Standby routers send periodic HSRP messages once the protocol has completed the election process.
只有active和standby周期发送hsrp信息
If the Active router fails, the Standby router takes over as the Active router.
active挂了,standby成为active
If the Standby router fails or becomes the Active router, then another router is elected as the Standby router.
standby挂了或者变成active,另一个路由器会重新被选举为standby。
应该可以理解为standby设备在状态改变之前,其他设备并不是standby。

suzhouxiaoniu
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maguanghua2013 发表于 2016-12-21 16:30
这句是没说,下面说了。
only the Active and Standby routers send periodic HSRP messages once the p ...

是的,可以这么意会,;P,
为什么很多地方都说可以有多个备用路由器呢,明显的问题,大部分人都说正常的
难道是监听路由器也可以成为备用路由器,所有监听路由器也算备用的一种形式,只能瞎猜了

菠菜呀
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要么可以理解成概念问题,也就是官方的文档可以理解为HSRP只有主和备两种角色,除了主路由器其他的都可以理解为备路由器角色,只不过只有一台出于standby状态,其他listen状态的可以理解成standby的standby。

suzhouxiaoniu
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sprite 发表于 2016-12-21 16:57
要么可以理解成概念问题,也就是官方的文档可以理解为HSRP只有主和备两种角色,除了主路由器其他的都可以理 ...

是的,最后都只能这么想了
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