simple_int

Simple Int

                   +--+
                   |h4|
                   ++-+
                    |
                    |
+--+      +--+     ++-+     +--+
|h1+------+s1+-----+s3+-----+h3|
+--+      +-++     +--+     +--+
            |
            |
          +-++
          |s2|
          +-++
            |
            |
          +-++
          |h2|
          +--+

Introduction

This example uses the Ipv4 options header to store per hop statistics such as switch id, queue depth, output port. In order to be ale to deparse the Options header use the receiver.py script.

How to run

Run the topology:

sudo p4run

or

sudo python network.py

Start the receiver script at h2:

mx h2
python receive.py

Send 1 packet with Ipv4 Options header prepared:

mx h1
python send.py 10.0.2.2 "test" 1

At the receiver you should observe something like:

sniffing on h2-eth0
got a packet
###[ Ethernet ]### 
  dst       = 00:00:0a:00:02:02
  src       = 00:01:0a:00:02:02
  type      = IPv4
###[ IP ]### 
     version   = 4
     ihl       = 8
     tos       = 0x0
     len       = 44
     id        = 1
     flags     = 
     frag      = 0
     ttl       = 62
     proto     = udp
     chksum    = 0x62be
     src       = 10.0.1.1
     dst       = 10.0.2.2
     \options   \
      |###[ INT ]### 
      |  copy_flag = 0
      |  optclass  = control
      |  option    = 31
      |  length    = 12
      |  count     = 2
      |  \int_headers\
      |   |###[ SwitchTrace ]### 
      |   |  swid      = 2
      |   |  qdepth    = 0
      |   |  portid    = 1
      |   |###[ SwitchTrace ]### 
      |   |  swid      = 1
      |   |  qdepth    = 0
      |   |  portid    = 2
###[ UDP ]### 
        sport     = 4321
        dport     = 1234
        len       = 12
        chksum    = 0xeb46
###[ Raw ]### 
           load      = 'test'