Sequence diagram template for reuse.

participant h1
participant s1
participant c0 
participant h2
participant h3
h1->s1: ARP Request
s1-->h2: ARP Request
s1-->h3: ARP Request
h2->s1: ARP Reply
s1->h1: ARP Reply
h1->s1: ICMP Echo Req
s1->h2: ICMP Echo Req
h2->s1: ICMP Echo Reply
s1->h1: ICMP Echo Reply
h2->s1: ARP Req
s1-->h1: ARP Req
s1-->h3: ARP Req
h1->s1: ARP Reply
s1->h2: ARP Reply

participant SW
participant C
participant App
SW->C: PacketIn
C->App: PacketIn
App->C: PacketOut
C->SW: PacketOut
App->C: FlowMod
C->SW: FlowMod
SW->C: FlowExpired/Removed
C->App: FlowExpired/Removed
App->C: StatsReq
C->SW: StatsReq?