My Cisco 1600 router is connected to the 100Mb Catalyst switch. And I get to many deferred collisions (0.5%-1%) on its Ethernet interface. The interface speed is 10Mb. What may be the reason?

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As you are running the interface at 10 MB, you are almost certainly running it half duplex. Collisions are normal in half-duplex. 1/2% or 1% collisions is a small number for Ethernet. Don't even bother to think twice about collisions until they get to more than 30% in a half-duplex network. Collisions don't start to be a real problem until well over 60%, but as they start to rise, it may be time to start thinking vaguely about whether your traffic levels and patterns might warrant re-segmenting or installing faster links.

This was first published in September 2002

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