[P4-discuss] table Match/action LPM

Thambi Sreedharan thambisree at gmail.com
Tue Oct 11 18:03:27 EDT 2016


Hi Antonin

Thanks it was my bad the ip address was not in range.

warm Regards
Thambi


On Mon, Oct 10, 2016 at 3:03 PM, Antonin Bas <antonin at barefootnetworks.com>
wrote:

> Hi,
>
> Please use the p4-dev mailing list for questions related to the p4lang
> software.
> The priority of a LPM entry is determined by the prefix length. In your
> case the switch will first check if entry 2 matches (because it has the
> longest prefix), then entry 1, then entry 0.
> If this is not the behavior you are observing, you can submit a bug to the
> p4-dev mailing list. You will need to provide 1) a sample P4 program to
> reproduce the issue 2) the appropriate CLI commands to populate tables 3)
> an example input packet that exhibits the bug.
>
> Thanks,
>
> Antonin
>
> On Mon, Oct 10, 2016 at 1:58 PM, Thambi Sreedharan <thambisree at gmail.com>
> wrote:
>
>> Hi
>>
>> The LPM based matche table  the location of entry is important. How to in
>> runtime_CLI How to  specify the location instead of using  table_add  or my
>> understanding on the LPM is wrong.
>>
>> we programmed as follow:
>>
>>
>>
>>
>>              Entry_hdl        match              Action
>>  Data
>>         +-----------------+-------------------+---------------------
>> +----------+
>>         |                 |                   |                     |
>>      |
>>         |        0        |    0.0.0.0/0      |    set_vrf          |
>> vrf=10   |
>>         +-----------------+-------------------+---------------------
>> +----------+
>>         |                 |                   |                     |
>>      |
>>         |        1        |   192.168.6.0/24  |     set_vrf         |
>> vrf=2    |
>>         |                 |                   |                     |
>>      |
>>         +-----------------+-------------------+---------------------
>> +----------+
>>         |                 |                   |                     |
>>      |
>>         |        2        |   192.168.6.1/32  |    set_vrf          |
>> vrf=3    |
>>         |                 |                   |                     |
>>      |
>>         +-----------------+-------------------+---------------------
>> +----------+
>>
>> it always hitting Entry 0, instead of Entry 2.
>>
>> Please let me how to specify the entry while adding
>>
>> Thanks
>> Thambi
>>
>> _______________________________________________
>> P4-discuss mailing list
>> P4-discuss at lists.p4.org
>> http://lists.p4.org/mailman/listinfo/p4-discuss_lists.p4.org
>>
>
>
>
> --
> Antonin
>
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