From: navaid@rogers.com
Date: Sun Sep 21 2003 - 01:32:32 GMT-3
This link has following example for rate-limit access-list:
The following example assigns packets with an IP Precedence of 0, 1, or 2 to the rate-limit access list 25:
access-list rate-limit 25 mask 42
I think it is incorrect. Correct mask to match precedence of 0,1, or 2 is Hex 07. So it should be:
access-list rate-limit 25 mask 07
Navaid
>
> From: "Boyan Krosnov" <bkrosnov@lirex.bg>
> Date: 2003/09/20 Sat PM 07:40:19 EDT
> To: <ccielab@groupstudy.com>
> Subject: RE: access-list rate-limit with precedence mask
>
> I just love posting links :)
> -------------------
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_
> reference_chapter09186a0080087f36.html#1017390
> -----------------
> Use the mask keyword to assign multiple IP precedences or MPLS
> experimental field values to the same rate-limit access list. To
> determine the mask value, perform the following steps:
> ------------------------------------------------------------------------
> --------
> Step 1 Decide which precedences you want to assign to this rate-limit
> access list.
>
>
> Step 2 Convert the precedences or MPLS experimental field values into
> an 8-bit numbers with each bit corresponding to one value. For example,
> an MPLS experimental field value of 0 corresponds to 00000001, 1
> corresponds to 00000010, 6 corresponds to 01000000, and 7 corresponds to
> 10000000.
>
> Step 3 Add the 8-bit numbers for the selected MPLS experimental field
> values. For example, the mask for MPLS experimental field values 1 and 6
> is 01000010.
>
> Step 4 The command expects hexadecimal format. Convert the binary mask
> into the corresponding hexadecimal number. For example, 01000010 becomes
> 42. This value is used in the access-list rate-limit command. Any
> packets that have an MPLS experimental field value of 1 or 6 will match
> this access list.
>
>
> ------------------------------------------------------------------------
> --------
> A mask of FF matches any precedence, and 00 does not match any
> precedence.
> -------------------------------------
> the answer is "access-list rate-limit 1 mask 62" in my book.
>
> BR,
> Boyan Krosnov, CCIE#8701
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of Shawn Yang
> > Sent: Sunday, September 21, 2003 2:11 AM
> > To: ccielab@groupstudy.com
> > Subject: access-list rate-limit with precedence mask
> >
> >
> > 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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1
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