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[其他] 此题有疑问,关于PORT_CHANNEL

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发表于 2013-7-17 22:44:34 | 显示全部楼层 |阅读模式
QUESTION 12
The network administrator wants to enable an EtherChannel between two switches in "on" mode. The administrator connects the cables and enables the interfaces,
but while configuring the EtherChannel in the first switch, a spanning-tree loop was detected. Which two of these procedures can avoid this problem? (Choose two.)
A. Configure the EtherChannel as "desirable" first.
B. Assign all interfaces to the same VLAN.
C. Disable PortFast on the interfaces in the EtherChannels.
D. Disable all interfaces first.
E. Fast Ethernet and Gigabit Ethernet ports cannot be assigned to the same EtherChannel.
F. Fix cabling problems.
Correct Answer: AD
Section: (none)
Explanation
Explanation/Reference:


答案D我认可,但是答案A貌似不能解决环路吧
 成长值: 57115
发表于 2013-7-19 15:17:24 | 显示全部楼层
使用on的话,依靠的是cdp,也就是邻居存在 就转发数据,当然容易出环;修改成desirable模式的话,会去学习对端,学习不到的话,就处于down状态。 不会出环

点评

同意。当处于ON状态的时候是不会协商的,在这个题中当一方配成channel,一方还没有的时候,如果接口都是no shut。生成树会成环。  发表于 2013-7-25 20:16
沙发 2013-7-19 15:17:24 回复 收起回复
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