From: Shawn Yang (syang@bitfone.com)
Date: Sat Sep 20 2003 - 21:00:51 GMT-3
Hi, Boyan,
Thanks for the reply.
But, according to the rule posted here, the mask for 1-5 should
be 62 decimal and 3E hex. Is not it?
Shawn
---------- Original Message ----------------------------------
From: "Boyan Krosnov" <bkrosnov@lirex.bg>
Reply-To: "Boyan Krosnov" <bkrosnov@lirex.bg>
Date: Sun, 21 Sep 2003 02:40:19 +0300
>I just love posting links :)
>-------------------
>http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_co
mmand_
>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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