from trex_stl_lib.api import * from scapy.contrib.mpls import * # import from contrib folder of scapy class STLS1(object): def __init__ (self): pass; def create_stream (self): # 2 MPLS label the internal with s=1 (last one) pkt = Ether()/MPLS(label=17,cos=1,s=0,ttl=255)/MPLS(label=0,cos=1,s=1,ttl=12)/IP(src="16.0.0.1",dst="48.0.0.1")/UDP(dport=12,sport=1025)/('x'*20) vm = CTRexScRaw( [ STLVmFlowVar(name="mlabel", min_value=1, max_value=2000, size=2, op="inc"), # 2 bytes var STLVmWrMaskFlowVar(fv_name="mlabel", pkt_offset= "MPLS:1.label",pkt_cast_size=4, mask=0xFFFFF000,shift=12) # write to 20bit MSB ] ) # burst of 100 packets return STLStream(packet = STLPktBuilder(pkt = pkt ,vm = vm), mode = STLTXSingleBurst( pps = 1, total_pkts = 100) ) def get_streams (self, direction = 0): # create 1 stream return [ self.create_stream() ] def register(): return STLS1()