Hi Iwase,
thank you very much for your answer.
NXActionResubmitTable sounds promising, I will give it a try.
This however leaves one problem to me: Lets say I have a group with 4
buckets, one of them is selected based on some kind of hashing. If I use
NXActionResubmitTable to resubmit this to a table, how can I distinguish
which bucket has forwarded the packet?
My first idea was to add four different metadata values and match on the
metadata in the next table, bit adding metadata is an instruction as well.
In the Nicria extended actions, I have found no action which would match
my need. The only other Idea I currently have is to create four
different tables, and add another step of indirection. Something like
Table 0: match in port and prefix, go to Group Table (Group n)
Group n: 4 buckets, select one, go to table 2, 3, 4, or 5
Tables 2-5: match prefix again, add different metadata, for example
("13" in table 2, "14" in table 3, and so on) and all go to table 10
There I have to add a variable stack (min 1, max 3) of MPLS headers. As
far as I know, only one MPLS header can be pushed per table. Matchin on
each of those tables is done using the metadata set before. Hence:
Table 10: add MPLS header + tag, if done output else goto table 11
Table 11: add MPLS header + tag, if done output else goto table 12
Table 12: add MPLS header + tag, output
I think that should work, but if there was an action to add metadata,
this would remove the need for tables 2 - 5.
Thanks and best regards
Daniel
On 24.08.2015 02:27, Yusuke Iwase wrote:
> Hi,
>
> On 2015年08月23日 00:38, Daniel Herrmann wrote:
>> Hi,
>>
>> I am using Ryu and OVS in order to set up some tests. I need to do the
>> following:
>>
>> Table 0 matches on some factors such as IP addresses and so on and
>> forwards the processing to a specific group ID.
>>
>> Based on the group result I need to add multiple MPLS headers. As I
>> cannot push multiple headers in one table, I am using Table 10 - 12 to
>> push MPLS headers.
>>
>> The basic idea now is:
>>
>> Match on Table 0 and forward to group table. There, n Buckets are
>> present, let us say 4 buckets. Each bucket should assign one metadata
>> value (for example 1-4) and go to table 10 for further processing. Based
>> on the metadata, tables 10 - 12 add the required label stack and finally
>> output the packet on the right port.
>>
>> My understanding of OFPGroupMod however is, that it takes actions as
>> argument. Adding metadata and going to another table however is an
>> instruction.
>
> As you say, OpenFlow Spec does not allow GoToTable instruction in GroupTable,
> only actions are permitted.
>
> But if you use OVS, NXActionResubmitTable, which is Nicira Extended Action,
> maybe available in GroupTable.
> https://github.com/osrg/ryu/blob/master/ryu/ofproto/nx_actions.py#L383
>
> Thanks,
> Iwase
>
>>
>> Do you have any idea how to solve this?
>>
>> VG
>> Daniel
>>
>> ------------------------------------------------------------------------------
>> _______________________________________________
>> Ryu-devel mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>>
------------------------------------------------------------------------------
_______________________________________________
Ryu-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ryu-devel
