This is my first lab to use InBand Network Telemetry with P4. To use this lab, you will need following requirements:

• Virtualbox
• Vagrant
• Ansible

Use InBand Network Telemetry to collect metadata from BMv2 switches.

• vagrant up will create four virtual machines and start the topology.
• vagrant ssh host-1 will make a ssh connection in a virtual machine host-1. This virtual machine has IP address 192.168.50.11
• vagrant ssh host-2 will make a ssh connection in a virtual machine host-2. This virtual machine has IP address 192.168.50.12

In host-2 you need run the python script (receive.py) for start server application.

• cd /vagrant/code
• sudo ./receive.py

In host-1 you need run the python script (send.py) for start client application.

• cd /vagrant/code
• sudo ./send.py 192.168.50.12

In host-2 terminal you can see metadata that were collected from switches. The metadata are:

• switchID_t: switch identifier
• ingress_port: for new packets, the number of the ingress port on which the packet arrived to the device.
• egress_port: the output port this packet is destined to.
• egress_spec: Can be assigned a value in ingress code to control which output port a packet will go to.
• ingress_global_timestamp: a timestamp, in microseconds, set when the packet shows up on ingress.
• egress_global_timestamp: a timestamp, in microseconds, set when the packet starts egress processing.
• enq_timestamp: a timestamp, in microseconds, set when the packet is first enqueued.
• enq_qdepth: the depth of the queue when the packet was first enqueued, in units of number of packets (not the total size of packets).
• deq_timedelta: the time, in microseconds, that the packet spent in the queue.
• deq_qdepth: the depth of queue when the packet was dequeued, in units of number of packets (not the total size of packets).