此题有疑问,关于PORT_CHANNEL
QUESTION 12The 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 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
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