I want to modify a packet header field MPLS LABEL by adding a constant to it. Openflow 1.3 supports "set field" action by which we can assign a new value to a packet header. But I am not able to find any way to add a constant to an existing value of a packet header. One direction which I can think of is to copy the content of MPLS LABEL field to the metadata field supported by OpenFlow 1.3 and then do an add operation on the metadata field. But I do not know if this is possible or not. Another direction I can think is to pop the MPLS header, add the constant to MPLS LABEL field and then push the modified MPLS header. Is this possible?
Thanks, Michael
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