When both ip route-cache and CEF are enabled on a router's serial interface does one method take precedence over the other? In other words, I see entries for destination networks on the outputs of both "show ip cache" & "show ip cef" commands, which one does the router actually reference?
Also, how does this affect ACL processing? If the packets are being fast-switched would each packet still be matched against every ACL entry?
This is correct. The router will try to cef switch packets first, and if they can't be cef switched, punt them to the next slower path, which would be fast switching, if that's enabled. If they can't be fast switched, they would be punted to the process switching path. A couple of notes on this, however. First, fast switching is gone from the code in some recent relase or another, though I don't remember where. Second, some hardware platforms (hardware based switching paths) will not punt packets to the next slower path, such as the Cisco 12000.
We are pleased to announce availability of Beta software for 16.6.3.
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