From: Boyan Krosnov (bkrosnov@lirex.bg)
Date: Sat Sep 20 2003 - 20:44:05 GMT-3
fast fingers again....
the mask is hexadecimal, so 3E, not 62.
31 is 0011 0001 -- 0,4 and 5
3E is 0011 1110 - 1,2,3,4 and 5
> -----Original Message-----
> From: Boyan Krosnov
> Sent: Sunday, September 21, 2003 2:40 AM
> 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/product
> s_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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