June 2007
Intermediate to advanced
600 pages
18h 19m
English
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Configuring and Managing Switching Paths
Configuring switching paths is done both globally and at the interface level. This allows the flexibility of configuring different switching paths on each interface. For example, you may want to disable CEF on an interface to see whether it's causing problems.
Process Switching
To force a router to use process switching, turn off all other switching methods.
Here, I'm showing the performance of a Cisco 2621XM router with about 600k of traffic running over serial interface s0/1:
R1#sho int s0/1 | include minute
5 minute input rate 630000 bits/sec, 391 packets/sec
5 minute output rate 627000 bits/sec, 391 packets/secThe normal switching method for this interface on this router is CEF. To show what
switching path is running on interface s0/1, use the show ip
interface s0/1 | include switching command:
R1#sho ip interface s0/1 | include switchingIP fast switching is enabledIP fast switching on the same interface is enabled IP Flow switching is disabledIP CEF switching is enabledIP CEF Fast switching turbo vector IP multicast fast switching is enabled IP multicast distributed fast switching is disabled
Notice that fast switching and CEF are both enabled. CEF will try to switch the packet first. If CEF cannot switch the packet, it will punt the packet to the next best available switching path—fast switching. If fast switching cannot process the packet, the router will process-switch the packet. If all the other switching paths are turned off, the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.