First part of a BVI refactor

The handling of BVI is awkward, with the autoderived interface name
"bviXX" based on the bridgedomain bd_id. Lots of special casing happens
on account of this decision, and to make matters worse there is poor
interaction (leading to VPP crashes) when BVIs and Loopbacks are used
at the same time: https://lists.fd.io/g/vpp-dev/message/21116

This is step one of a refactor of the logic. In this commit, I'm
removing all of the BVI logic from the codebase, rendering bridgedomains
unable to have IP interfaces. In the next commit, I will introduce new
behavior in the schema, allowing for 'bvi' to be a loopback
interfacename which will be used as BVI for a bridgedomain, restoring
the ability to use bridgedomains with IP interfaces (using a loop).
This commit is contained in:
Pim van Pelt
2022-03-27 20:04:22 +00:00
parent 90c23cf987
commit 850b982f2a
15 changed files with 25 additions and 248 deletions

View File

@ -146,9 +146,6 @@ and finally all objects are synchronized with the configuration (IP addresses, M
* Remove all member interfaces (including BVIs) that are not in the config, return them to
L3 mode
* Remove tag-rewrite options on removed member interfaces if they have encapsulation
1. Retrieve all BVIs from VPP
* Remove all IP addresses that are not in the config
* Remove those that do not exist in the config
1. For L2 Cross Connects from VPP
* For interfaces that do not exist in the config (either as source or target):
* Return the interface to L3 mode
@ -172,7 +169,6 @@ and finally all objects are synchronized with the configuration (IP addresses, M
### Creating
1. Loopbacks
1. BVIs
1. BondEthernets
1. Tunnels
1. Sub Interfaces: First Dot1Q and Dot1AD (one tag), and then QinQ and QinAD (two tags)

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@ -16,16 +16,6 @@ import config.interface as interface
import config.lcp as lcp
import config.address as address
def get_bvis(yaml):
""" Return a list of all bridgedomains which have an LCP (ie bvi*). """
ret = []
if not 'bridgedomains' in yaml:
return ret
for ifname, iface in yaml['bridgedomains'].items():
if 'lcp' in iface:
instance = int(ifname[2:])
ret.append("bvi%d" % instance)
return ret
def get_bridgedomains(yaml):
""" Return a list of all bridgedomains. """
@ -37,33 +27,6 @@ def get_bridgedomains(yaml):
return ret
def get_by_lcp_name(yaml, lcpname):
""" Returns the bridgedomain by a given lcp name, or None,None if it does not exist """
if not 'bridgedomains' in yaml:
return None,None
for ifname, iface in yaml['bridgedomains'].items():
if 'lcp' in iface and iface['lcp'] == lcpname:
return ifname, iface
return None,None
def get_by_bvi_name(yaml, ifname):
""" Return the BridgeDomain by BVI interface name (bvi*), if it exists. Return None,None otherwise. """
if not 'bridgedomains' in yaml:
return None,None
if not ifname.startswith("bvi"):
return None,None
idx = ifname[3:]
if not idx.isnumeric():
return None,None
bridgename = "bd%d" % int(idx)
if bridgename in yaml['bridgedomains'] and 'lcp' in yaml['bridgedomains'][bridgename]:
return bridgename, yaml['bridgedomains'][bridgename]
return None, None
def get_by_name(yaml, ifname):
""" Return the BridgeDomain by name (bd*), if it exists. Return None,None otherwise. """
try:
@ -80,19 +43,6 @@ def is_bridgedomain(yaml, ifname):
return not iface == None
def is_bvi(yaml, ifname):
""" Returns True if the interface name (bvi*) is an existing BVI. """
bridgename, bridge = get_by_bvi_name(yaml, ifname)
if not bridge:
return False
## If the BridgeDomain has an 'lcp', then it has a Bridge Virtual Interface
if 'lcp' in bridge:
return True
return False
def get_bridge_interfaces(yaml):
""" Returns a list of all interfaces that are bridgedomain members """
@ -138,18 +88,6 @@ def validate_bridgedomains(yaml):
msgs.append("bridgedomain %s is reserved" % ifname)
result = False
if 'addresses' in iface and not 'lcp' in iface:
msgs.append("bridgedomain %s has an address but no LCP" % ifname)
result = False
if 'lcp' in iface and not lcp.is_unique(yaml, iface['lcp']):
msgs.append("bridgedomain %s does not have a unique LCP name %s" % (ifname, iface['lcp']))
result = False
if 'addresses' in iface:
for a in iface['addresses']:
if not address.is_allowed(yaml, ifname, iface['addresses'], a):
msgs.append("bridgedomain %s IP address %s conflicts with another" % (ifname, a))
result = False
if 'interfaces' in iface:
for member in iface['interfaces']:
if (None, None) == interface.get_by_name(yaml, member):
@ -160,7 +98,6 @@ def validate_bridgedomains(yaml):
if not is_bridge_interface_unique(yaml, member):
msgs.append("bridgedomain %s member %s is not unique" % (ifname, member))
result = False
if interface.has_lcp(yaml, member):
msgs.append("bridgedomain %s member %s has an LCP" % (ifname, member))
result = False

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@ -256,7 +256,7 @@ def get_phys(yaml):
""" Return a list of all toplevel (ie. non-sub) interfaces which are
assumed to be physical network cards, eg TenGigabitEthernet1/0/0. Note
that derived/created interfaces such as Tunnels, BondEthernets and
Loopbacks/BVIs are not returned """
Loopbacks are not returned """
ret = []
if not 'interfaces' in yaml:
return ret
@ -279,8 +279,6 @@ def is_phy(yaml, ifname):
return False
if loopback.is_loopback(yaml, ifname):
return False
if bridgedomain.is_bvi(yaml, ifname):
return False
if vxlan_tunnel.is_vxlan_tunnel(yaml, ifname):
return False
return True

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@ -7,28 +7,6 @@ class TestBridgeDomainMethods(unittest.TestCase):
with open("unittest/test_bridgedomain.yaml", "r") as f:
self.cfg = yaml.load(f, Loader = yaml.FullLoader)
def test_get_by_lcp_name(self):
ifname, iface = bridgedomain.get_by_lcp_name(self.cfg, "bvi12")
self.assertIsNotNone(iface)
self.assertEqual("bd12", ifname)
ifname, iface = bridgedomain.get_by_lcp_name(self.cfg, "bvi-noexist")
self.assertIsNone(iface)
self.assertIsNone(ifname)
def test_get_by_bvi_name(self):
ifname, iface = bridgedomain.get_by_bvi_name(self.cfg, "bvi11")
self.assertEqual("bd11", ifname)
self.assertIsNotNone(iface)
ifname, iface = bridgedomain.get_by_bvi_name(self.cfg, "bvi10")
self.assertIsNone(ifname)
self.assertIsNone(iface)
ifname, iface = bridgedomain.get_by_bvi_name(self.cfg, "bd11")
self.assertIsNone(ifname)
self.assertIsNone(iface)
def test_get_by_name(self):
ifname, iface = bridgedomain.get_by_name(self.cfg, "bd10")
self.assertIsNotNone(iface)
@ -43,17 +21,9 @@ class TestBridgeDomainMethods(unittest.TestCase):
def test_is_bridgedomain(self):
self.assertTrue(bridgedomain.is_bridgedomain(self.cfg, "bd10"))
self.assertTrue(bridgedomain.is_bridgedomain(self.cfg, "bd11"))
self.assertTrue(bridgedomain.is_bridgedomain(self.cfg, "bd12"))
self.assertFalse(bridgedomain.is_bridgedomain(self.cfg, "bd-notexist"))
self.assertFalse(bridgedomain.is_bridgedomain(self.cfg, "GigabitEthernet1/0/0"))
def test_is_bvi(self):
self.assertFalse(bridgedomain.is_bvi(self.cfg, "bvi10"))
self.assertTrue(bridgedomain.is_bvi(self.cfg, "bvi11"))
self.assertTrue(bridgedomain.is_bvi(self.cfg, "bvi12"))
self.assertFalse(bridgedomain.is_bvi(self.cfg, "bvi-notexist"))
self.assertFalse(bridgedomain.is_bvi(self.cfg, "GigabitEthernet1/0/0"))
def test_members(self):
self.assertTrue(bridgedomain.is_bridge_interface(self.cfg, "GigabitEthernet1/0/0"))
self.assertTrue(bridgedomain.is_bridge_interface(self.cfg, "GigabitEthernet2/0/0.100"))
@ -74,10 +44,3 @@ class TestBridgeDomainMethods(unittest.TestCase):
def test_get_bridgedomains(self):
ifs = bridgedomain.get_bridgedomains(self.cfg)
self.assertEqual(len(ifs), 3)
def test_get_bvis(self):
ifs = bridgedomain.get_bvis(self.cfg)
self.assertEqual(len(ifs), 2)
self.assertNotIn("bvi10", ifs)
self.assertIn("bvi11", ifs)
self.assertIn("bvi12", ifs)

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@ -28,6 +28,9 @@ interfaces:
GigabitEthernet3/0/0:
description: "Infra: Bridge Domain 10"
GigabitEthernet3/0/1:
l2xc: BondEthernet0.204
BondEthernet0:
description: "Bond, James Bond!"
mac: 00:01:02:03:04:05
@ -52,6 +55,11 @@ interfaces:
encapsulation:
dot1ad: 1000
inner-dot1q: 1000
204:
encapsulation:
dot1ad: 1001
inner-dot1q: 1001
l2xc: GigabitEthernet3/0/1
loopbacks:
loop0:
@ -59,11 +67,11 @@ loopbacks:
mtu: 9216
lcp: "loop0"
addresses: [ 192.0.2.1/32, 2001:db8:1::1/128 ]
loop1:
description: "Another loop"
bridgedomains:
bd10:
description: "Bridge Domain 10"
mtu: 1500
lcp: "bvi10"
addresses: [ 192.0.2.9/29, 2001:db8:2::1/64 ]
interfaces: [ BondEthernet0.203, GigabitEthernet3/0/0 ]

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@ -13,8 +13,6 @@ vxlan:
bridgedomain:
description: str(exclude='\'"',len=64,required=False)
mtu: int(min=128,max=9216,required=False)
lcp: str(max=15,matches='[a-z]+[a-z0-9-]*',required=False)
addresses: list(ip_interface(),min=1,max=6,required=False)
interfaces: list(str(),required=False)
---
loopback:

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@ -44,13 +44,10 @@ bridgedomains:
mtu: 3000
interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1, BondEthernet0 ]
bd11:
description: "Bridge Domain 11, both LCP and address"
description: "Bridge Domain 11, with sub-interfaces"
mtu: 2000
interfaces: [ GigabitEthernet2/0/0.100, GigabitEthernet2/0/1.100, BondEthernet0.100 ]
lcp: "bvi123456789012"
addresses: [ 192.0.2.1/29, 2001:db8::1/64 ]
bd12:
description: "Bridge Domain 12, invalid because it has Gi1/0/0 as well"
mtu: 9000
interfaces: [ GigabitEthernet4/0/0, GigabitEthernet1/0/0 ]
lcp: "bvi12"

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@ -29,6 +29,4 @@ bridgedomains:
bd10:
description: "Bridge Domain 10"
mtu: 2000
lcp: "bvi10"
addresses: [ 10.0.0.2/32, 2001:db8::2/128 ]
interfaces: [ GigabitEthernet3/0/0 ]

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@ -46,15 +46,8 @@ bridgedomains:
mtu: 3000
interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1, BondEthernet0 ]
bd11:
description: "Bridge Domain 11, both LCP and address"
description: "Bridge Domain 11"
mtu: 2000
interfaces: [ GigabitEthernet2/0/0.100, GigabitEthernet2/0/1.100, BondEthernet0.100 ]
lcp: "bvi123456789012"
addresses: [ 192.0.2.1/29, 2001:db8::1/64 ]
interfaces: [ GigabitEthernet2/0/0.100, GigabitEthernet2/0/1.100 ]
bd12:
description: "Bridge Domain 12, LCP but no address"
mtu: 9000
interfaces: [ GigabitEthernet4/0/0, GigabitEthernet4/0/1 ]
lcp: "bvi12"
bd13:
description: "Bridge Domain 13, it is OK to have no member interfaces"
description: "Bridge Domain 12, it is OK to have no member interfaces"

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@ -71,6 +71,4 @@ bridgedomains:
bd10:
description: "Bridge Domain 10"
mtu: 1500
lcp: "bvi10"
addresses: [ 192.0.2.9/29, 2001:db8:2::1/64 ]
interfaces: [ BondEthernet0.203, GigabitEthernet3/0/0 ]

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@ -5,8 +5,7 @@ test:
- "interface .* IP address .* conflicts with another"
- "sub-interface .* IP address .* conflicts with another"
- "loopback .* IP address .* conflicts with another"
- "bridgedomain .* IP address .* conflicts with another"
count: 18
count: 14
---
interfaces:
GigabitEthernet1/0/0:
@ -27,8 +26,6 @@ interfaces:
GigabitEthernet1/0/2:
lcp: e0-2
description: "These addresses overlap with bd1"
addresses: [ 192.0.2.18/29, 2001:db8:3::2/64 ]
GigabitEthernet1/0/3:
lcp: e0-3
@ -54,11 +51,3 @@ loopbacks:
description: "These addresses overlap with Gi1/0/1.101"
lcp: "loop0"
addresses: [ 192.0.2.9/29, 2001:db8:2::1/64 ]
bridgedomains:
bd1:
description: "These addresses overlap with Gi1/0/2"
mtu: 2000
lcp: "bvi1"
addresses: [ 192.0.2.17/29, 2001:db8:3::1/64 ]
interfaces: [ GigabitEthernet3/0/0 ]

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@ -1,19 +0,0 @@
test:
description: "A bridgedomain with a BVI address must have an LCP"
errors:
expected:
- "bridgedomain .* has an address but no LCP"
count: 1
---
interfaces:
GigabitEthernet1/0/0:
mtu: 3000
GigabitEthernet1/0/1:
mtu: 3000
bridgedomains:
bd13:
description: "Bridge Domain 13, address but no LCP"
mtu: 3000
interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1 ]
addresses: [ 192.0.2.9/29, 2001:db8:1::1/64 ]

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@ -4,9 +4,8 @@ test:
expected:
- "interface .* does not have a unique LCP name"
- "loopback .* does not have a unique LCP name"
- "bridgedomain .* does not have a unique LCP name"
- "bridgedomain bd0 is reserved"
count: 4
count: 3
---
interfaces:
GigabitEthernet1/0/0:
@ -24,5 +23,4 @@ loopbacks:
bridgedomains:
bd0:
description: "bd_id 0 in VPP is reserved"
lcp: "e1"
interfaces: [ GigabitEthernet2/0/0, GigabitEthernet2/0/1 ]

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@ -75,9 +75,6 @@ class Reconciler():
if not self.prune_bridgedomains():
self.logger.warning("Could not prune BridgeDomains from VPP")
ret = False
if not self.prune_bvis():
self.logger.warning("Could not prune BVIs from VPP")
ret = False
if not self.prune_l2xcs():
self.logger.warning("Could not prune L2 Cross Connects from VPP")
ret = False
@ -158,36 +155,6 @@ class Reconciler():
return True
def prune_bvis(self):
""" Remove BVIs (bridge-domain virtual interfaces) from VPP, if they do not occur in the config. """
removed_interfaces=[]
for numtags in [ 2, 1, 0 ]:
for idx, vpp_iface in self.vpp.config['interfaces'].items():
if vpp_iface.interface_dev_type!='BVI':
continue
if vpp_iface.sub_number_of_tags != numtags:
continue
config_ifname, config_iface = bridgedomain.get_by_bvi_name(self.cfg, vpp_iface.interface_name)
if not config_iface:
self.prune_addresses(vpp_iface.interface_name, [])
if numtags == 0:
self.logger.info("1> bvi delete %s" % vpp_iface.interface_name)
removed_interfaces.append(vpp_iface.interface_name)
else:
self.logger.info("1> delete sub %s" % vpp_iface.interface_name)
removed_interfaces.append(vpp_iface.interface_name)
continue
self.logger.debug("BVI OK: %s" % (vpp_iface.interface_name))
addresses = []
if 'addresses' in config_iface:
addresses = config_iface['addresses']
self.prune_addresses(vpp_iface.interface_name, addresses)
for ifname in removed_interfaces:
self.vpp.remove_interface(ifname)
return True
def prune_bridgedomains(self):
""" Remove bridge-domains from VPP, if they do not occur in the config. If any interfaces are
@ -418,7 +385,7 @@ class Reconciler():
def prune_lcps(self):
""" Remove LCPs which are not in the configuration, starting with QinQ/QinAD interfaces, then Dot1Q/Dot1AD,
and finally PHYs/BondEthernets/Tunnels/BVIs/Loopbacks. For QinX, special care is taken to ensure that
and finally PHYs/BondEthernets/Tunnels/Loopbacks. For QinX, special care is taken to ensure that
their intermediary interface exists, and has the correct encalsulation. If the intermediary interface
changed, the QinX LCP is removed. The same is true for Dot1Q/Dot1AD interfaces: if their encapsulation
has changed, we will have to re-create the underlying sub-interface, so the LCP has to be removed.
@ -544,7 +511,7 @@ class Reconciler():
self.logger.debug("Dot1Q/Dot1AD LCP OK: %s -> (vpp=%s, config=%s)" % (lcp.host_if_name, vpp_iface.interface_name, config_ifname))
## Remove LCPs for interfaces, bonds, tunnels, loops, bvis
## Remove LCPs for interfaces, bonds, tunnels, loops
for idx, lcp in lcps.items():
vpp_iface = self.vpp.config['interfaces'][lcp.phy_sw_if_index]
if vpp_iface.sub_inner_vlan_id > 0 or vpp_iface.sub_outer_vlan_id > 0:
@ -552,8 +519,6 @@ class Reconciler():
if vpp_iface.interface_dev_type=='Loopback':
config_ifname, config_iface = loopback.get_by_lcp_name(self.cfg, lcp.host_if_name)
elif vpp_iface.interface_dev_type=='BVI':
config_ifname, config_iface = bridgedomain.get_by_lcp_name(self.cfg, lcp.host_if_name)
else:
config_ifname, config_iface = interface.get_by_lcp_name(self.cfg, lcp.host_if_name)
@ -575,8 +540,8 @@ class Reconciler():
def prune_admin_state(self):
""" Set admin-state down for all interfaces that are not in the config. """
for ifname in self.vpp.get_qinx_interfaces() + self.vpp.get_dot1x_interfaces() + self.vpp.get_bondethernets() + self.vpp.get_phys() + self.vpp.get_vxlan_tunnels() + self.vpp.get_bvis() + self.vpp.get_loopbacks():
if not ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg) + bridgedomain.get_bvis(self.cfg):
for ifname in self.vpp.get_qinx_interfaces() + self.vpp.get_dot1x_interfaces() + self.vpp.get_bondethernets() + self.vpp.get_phys() + self.vpp.get_vxlan_tunnels() + self.vpp.get_loopbacks():
if not ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg):
vpp_iface = self.vpp.config['interface_names'][ifname]
if self.__tap_is_lcp(vpp_iface.sw_if_index):
@ -595,9 +560,6 @@ class Reconciler():
if not self.create_loopbacks():
self.logger.warning("Could not create Loopbacks in VPP")
ret = False
if not self.create_bvis():
self.logger.warning("Could not create BVIs in VPP")
ret = False
if not self.create_bondethernets():
self.logger.warning("Could not create BondEthernets in VPP")
ret = False
@ -623,17 +585,6 @@ class Reconciler():
self.logger.info("1> create loopback interface instance %d" % (instance))
return True
def create_bvis(self):
for ifname in bridgedomain.get_bridgedomains(self.cfg):
ifname, iface = bridgedomain.get_by_name(self.cfg, ifname)
instance = int(ifname[2:])
if not 'lcp' in iface:
continue
if 'bvi%d'%instance in self.vpp.config['interface_names']:
continue
self.logger.info("1> bvi create instance %d" % (instance))
return True
def create_bondethernets(self):
for ifname in bondethernet.get_bondethernets(self.cfg):
if ifname in self.vpp.config['interface_names']:
@ -783,10 +734,6 @@ class Reconciler():
bridge_members = []
config_bridge_ifname, config_bridge_iface = bridgedomain.get_by_name(self.cfg, "bd%d"%instance)
if 'lcp' in config_bridge_iface:
bviname = "bvi%d" % instance
if not bviname in bridge_members:
self.logger.info("1> set interface l2 bridge bvi%d %d bvi" % (instance, instance))
if not 'interfaces' in config_bridge_iface:
continue
for member_ifname in config_bridge_iface['interfaces']:
@ -836,7 +783,7 @@ class Reconciler():
tag_list = [ 0, 1, 2 ]
for numtags in tag_list:
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg) + bridgedomain.get_bridgedomains(self.cfg):
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg):
if numtags == 0 and interface.is_sub(self.cfg, ifname):
continue
if numtags == 1 and not interface.is_sub(self.cfg, ifname):
@ -853,15 +800,6 @@ class Reconciler():
vpp_ifname, config_iface = loopback.get_by_name(self.cfg, ifname)
if 'mtu' in config_iface:
config_mtu = config_iface['mtu']
elif ifname.startswith("bd"):
instance=int(ifname[2:])
bviname="bvi%d" % instance
if bviname in self.vpp.config['interface_names']:
vpp_mtu = self.vpp.config['interface_names'][bviname].mtu[0]
config_ifname, config_iface = bridgedomain.get_by_name(self.cfg, ifname)
if 'mtu' in config_iface:
config_mtu = config_iface['mtu']
vpp_ifname = bviname
else:
if numtags > 0:
vpp_mtu = 0
@ -880,7 +818,7 @@ class Reconciler():
for idx, vpp_iface in self.vpp.config['interfaces'].items():
if vpp_iface.sub_number_of_tags != 0:
continue
if vpp_iface.interface_dev_type in ['local', 'Loopback', 'BVI', 'VXLAN', 'virtio']:
if vpp_iface.interface_dev_type in ['local', 'Loopback', 'VXLAN', 'virtio']:
continue
config_ifname, config_iface = interface.get_by_name(self.cfg, vpp_iface.interface_name)
@ -933,19 +871,13 @@ class Reconciler():
return ret
def sync_addresses(self):
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg) + bridgedomain.get_bridgedomains(self.cfg):
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg):
config_addresses=[]
vpp_addresses=[]
if ifname.startswith("loop"):
vpp_ifname, config_iface = loopback.get_by_name(self.cfg, ifname)
if 'addresses' in config_iface:
config_addresses = config_iface['addresses']
elif ifname.startswith("bd"):
config_ifname, config_iface = bridgedomain.get_by_name(self.cfg, ifname)
instance = int(ifname[2:])
vpp_ifname = "bvi%d" % instance
if 'addresses' in config_iface:
config_addresses = config_iface['addresses']
else:
vpp_ifname, config_iface = interface.get_by_name(self.cfg, ifname)
if 'addresses' in config_iface:
@ -961,15 +893,10 @@ class Reconciler():
return True
def sync_admin_state(self):
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg) + bridgedomain.get_bridgedomains(self.cfg):
for ifname in interface.get_interfaces(self.cfg) + loopback.get_loopbacks(self.cfg):
if ifname.startswith("loop"):
vpp_ifname, config_iface = loopback.get_by_name(self.cfg, ifname)
config_admin_state = 1
elif ifname.startswith("bd"):
config_ifname, config_iface = bridgedomain.get_by_name(self.cfg, ifname)
instance = int(ifname[2:])
vpp_ifname = "bvi%d" % instance
config_admin_state = 1
else:
vpp_ifname, config_iface = interface.get_by_name(self.cfg, ifname)
config_admin_state = 1

View File

@ -231,10 +231,6 @@ class VPPApi():
loopbacks = [self.config['interfaces'][x].interface_name for x in self.config['interfaces'] if self.config['interfaces'][x].interface_dev_type=='Loopback']
return loopbacks
def get_bvis(self):
bvis = [self.config['interfaces'][x].interface_name for x in self.config['interfaces'] if self.config['interfaces'][x].interface_dev_type=='BVI']
return bvis
def get_phys(self):
phys = [self.config['interfaces'][x].interface_name for x in self.config['interfaces'] if self.config['interfaces'][x].sw_if_index == self.config['interfaces'][x].sup_sw_if_index and self.config['interfaces'][x].interface_dev_type not in ['virtio', 'BVI', 'Loopback', 'VXLAN', 'local', 'bond']]
return phys