From: ElleJf\(Yahoo\) (ellejf@xxxxxxxxx)
Date: Mon May 28 2001 - 10:02:19 GMT-3
The mask of IP precedence in CAR is different from what we had known. To match
precedence level n, just set bit n to 1. (bit 0 being least significant) If
you don't want to match that level, leave the bit 0.
In this example, mask 7 in binary is 00000111, which will match precedence 0, 1
, 2. Also note that the relationship between different precedence level is OR.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Brian
Sent: Monday, May 28, 2001 7:48 AM
To: ccielab@groupstudy.com
Subject: CAR and IP precedence masks
The following taken out of a book says:
"The following access list uses a binary mask to match the precendece
levels 0, 1 and 2 only"
access-list rate-limit 25 mask 07
This is used with:
rate-limit input access-group rate-limit 25 conform-action set
prec-transmit 4
To me, that mask would match levels 0, 1, 2, 3, 4, 5, 6, 7
To make a mask for precedence levels 0, 1, 2, i would do:
000 prec 0
001 prec 1
010 prec 2
100 mask = 4, which would also match precedence 3. I see no way to
match 0, 1, 2 without also matching 3. Mask is opposite transposition as
a wildcard set.
If someone could offer some clarity, I would appreciate it.
Brian
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