The tunnel can be assigned certain quality of {HEAD ~ service elements} such as {TAIL ~ Enhance Transmission service groups}, priorities within Per Flow Control, a TRILL or a SPB path 
such as
The tunnel can be assigned certain quality of { HEAD ~ service elements } such as { TAIL ~ Enhance Transmission service groups } , priorities within Per Flow Control , a TRILL or a SPB path
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH