12-15-2003 07:42 AM - edited 03-02-2019 12:21 PM
How does this work if both CEF and Fast switching are both enabled on the same interface? How does it know to use CEF?
sh ip int:
FastEthernetx/x is up, line protocol is up
IP fast switching is enabled
IP fast switching on the same interface is disabled
IP Flow switching is disabled
IP CEF switching is enabled
IP Feature Fast switching turbo vector
IP Feature CEF switching turbo vector
IP multicast fast switching is disabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast, CEF
-TIA
Solved! Go to Solution.
12-15-2003 08:47 AM
CEF will attempt to switch the packet first, and if it cannot, it will "punt" the packet to the next slower switching path, in this case fast switching. It's just the way the code is written--the switching vector associated with an interface is a list of sorts, and hardware is always first on that list, followed by CEF, then followed by fast, and then other methods....
Look for punt.
:-)
Russ.W
12-15-2003 08:18 AM
CEF is the primary switching path when enabled on an interface.
12-15-2003 08:47 AM
CEF will attempt to switch the packet first, and if it cannot, it will "punt" the packet to the next slower switching path, in this case fast switching. It's just the way the code is written--the switching vector associated with an interface is a list of sorts, and hardware is always first on that list, followed by CEF, then followed by fast, and then other methods....
Look for punt.
:-)
Russ.W
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