伪新人求助～～～ip cef和ip route-cache有什么异同啊

bigbot123

如题，感觉两个都是快速交换技术啊，我的认为是两个都是用于一次路由多次交换的，求打醒

dingjerry

这个更清楚一点：

http://www.cisco.com/c/en/us/td/ ... w_i1.html#wp1085449

也就是说，CEF是众多switching方式中的一种。 其它的有distributed switching， fast-switching, 等等。

这些都是全局模式下的。  当你要对某一个接口disable/enable这些switching方式的时候，就要用到 ip route-cache 这个命令了。

ip route-cache [cef | distributed | flow | policy | same-interface]

no ip route-cache [cef | distributed | flow | policy | same-interface]

dingjerry

来一段英文：

During the history of Cisco IOS, multiple switching methods have been developed. Some methods are supported only on particular platforms. CEF is the latest switching method. When CEF is enabled globally (default behavior), the iproute-cache cef interface specific command is also enabled. This command ensures CEF switching is done for packets that enter this interface. Occasionally, if needed to disable CEF on one interface alone, the no ip route-cache cef command is added. This disables CEF switching for that interface alone. Cisco IOS does not add the no ip route-cache command to the running-config on its own when it is forced to disable CEF. It was introduced on many platforms in Cisco IOS 12.0 mainline, particularly low- and mid-range platforms such as the Cisco 1600, 2500, and 3600 Series.
When a router receives a packet on a routed interface, it first removes the Layer 2 (L2) frame information. It then stores the Layer 3 (L3) packet in Input/Output (I/O) memory. What happens next depends on the switching path that the packet follows.

tichi

cef转发和路由缓存

bigbot123

dingjerry 发表于 2015-9-22 01:54
来一段英文：

During the history of Cisco IOS, multiple switching methods have been developed. Som ...

原来是这样～～

李壑彝

李壑彝

李壑彝

route-cache

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route-cache

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route-cache

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route-cache

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route-cache

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route-cache

李壑彝

route-cache

李壑彝

route-cache