Send a flow statistics request to the switch and handle the response. There's
an example on the POX wiki ("Web Flow Statistics") and a link to another one
("Statistics Collector Example").
-- Murphy
On Aug 21, 2013, at 11:14 AM, Amer <[email protected]> wrote:
> Thank you for your helpful email
>
> I would like to ask you how can I get/retrieve the flow table of certain
> switch
>
> Best regards,
> Amer
>
> On ٢١/٠٨/٢٠١٣, at ٣:١٧ ص, Murphy McCauley <[email protected]> wrote:
>
>> Sorry, there's currently no example for this.
>>
>> There are a couple of prerequisites:
>> 1) You must be using a switch with the OVS/Nicira MPLS extensions
>> 2) You must be using the POX carp branch
>>
>>
>> After that, some quick pointers are...
>>
>> Import the Nicira extensions and packet library...
>> import pox.openflow.nicira as nx
>> import pox.lib.packet as pkt
>>
>> Build matches which match the MPLS unicast ethertype and some MPLS label...
>> msg = nx.nx_flow_mod()
>> msg.match.of_eth_type = pkt.ethernet.MPLS_TYPE
>> msg.match.of_mpls_label = 42
>>
>> Create actions which add/push an MPLS header and/or set the label value...
>> msg = nx.nx_flow_mod()
>> msg.actions.append(nx.nx_action_push_mpls()) # Create header/push label
>> msg.actions.append(nx.nx_reg_load(dst=nx.OXM_OF_MPLS_LABEL, value=42)) # Set
>> label
>>
>> There are also actions for popping labels, setting the MPLS TTL, etc. See
>> pox.openflow.nicira or the Open vSwitch reference.
>>
>> -- Murphy
>>
>> On Aug 20, 2013, at 5:02 PM, Amer <[email protected]> wrote:
>>
>>> Hello,
>>>
>>> Hope you the best of health
>>>
>>> I would like to ask these questions:
>>> How to push and pop MPLS Tag to new packets
>>> How to make switching based MPLS tag
>>>
>>> Best Regards,
>>> Amer
>>
>>
