Reserving P4 switch fails

[Garegin Grigoryan]

Hello,

I’m trying to reserve a P4 switch and get an error.

My project ID is 5f00e1ce-d082-4a2b-b08f-889658e932b7.

It has Switch.P4 tag. There is another slice on the project (not mine) that reserved the switch.

Here’s my Jupyter Notebook code:

slice_name = 'My_TOFINO_slice_3'
site_name = 'MICH'

num_workers = 6 # Tofino gives 8 ports: master + client + 6 workers

try:
slice = fablib.get_slice(slice_name)
slice.list_nodes()
print('Done retrieving existing slice')

except Exception as e:
print(f'Creating new slice: {slice_name}')
print(f'Previous error: {e}')

slice = fablib.new_slice(name=slice_name)

vm_names = ['master', 'client'] + [f'node{i}' for i in range(1, num_workers + 1)]

for vm_name in vm_names:
node = slice.add_node(
name=vm_name,
site=site_name,
image='default_ubuntu_20'
)
node.set_capacities(cores=2, ram=6, disk=10)
node.add_component(model='NIC_Basic', name='if1')

p4switch = slice.add_switch(
name='p4switch',
site=site_name
)

sw_ifaces = p4switch.get_interfaces()

print("Tofino switch interfaces:")
for idx, iface in enumerate(sw_ifaces):
print(idx, iface.get_name())

needed_ports = 2 + num_workers
if len(sw_ifaces) < needed_ports:
raise Exception(f"Need {needed_ports} switch interfaces, found {len(sw_ifaces)}")

links = {}

links['ms'] = slice.add_l2network(name='ms')
links['ms'].add_interface(slice.get_node('master').get_interface('master-if1-p1'))
links['ms'].add_interface(sw_ifaces[0])

links['cs'] = slice.add_l2network(name='cs')
links['cs'].add_interface(slice.get_node('client').get_interface('client-if1-p1'))
links['cs'].add_interface(sw_ifaces[1])

for i in range(1, num_workers + 1):
link_name = f'n{i}s'
links[link_name] = slice.add_l2network(name=link_name)

host = slice.get_node(f'node{i}')
links[link_name].add_interface(host.get_interface(f'node{i}-if1-p1'))
links[link_name].add_interface(sw_ifaces)

slice.submit()
print(f"Slice '{slice_name}' created and submitted.")

Screenshot for with the errors is attached.

Thanks.

[Komal Thareja]

Hi Garegin,

There are only 5 P4 switches on the testbed, and right now all of them are in use, which is why you’re seeing the “Insufficient Resources” error.

To check which sites have a P4 switch available, you can use this snippet:

# Show all sites with P4 availability
fields = ['name', 'state', "p4-switch_available"]
hosts_table = fablib.list_sites(
    output='pandas',
    fields=fields,
    force_refresh=True,
    filter_function=lambda x: x['state'] == 'Active'
)

I checked just now and none are currently available. The UCSD P4 switch frees up on 2026-06-22, so you may want to set up an advanced reservation for it.

Best,

Komal

[Author]

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