access-list rate-limit with precedence mask

From: Shawn Yang (syang@bitfone.com)
Date: Sat Sep 20 2003 - 20:10:33 GMT-3


Hi there,

The question says:

"
configure CAR to police up to 10Mbps of inboud traffic
with the precedence bit value from 1 to 5.
"

The solution has such an access-list created.

access-list rate-limit 1 mask 31.

My questions is why a mask of 31 correspond to values
of 1-5?

Could not find any detailed doc about how the mask
should be derived in this case.

Any help is appreciated!

Shawn

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