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authorChristian Breunig <christian@breunig.cc>2023-11-22 10:52:40 +0100
committerMergify <37929162+mergify[bot]@users.noreply.github.com>2023-11-22 10:05:48 +0000
commitb083d60102e5b955a7dda544e94bc92b21e619b6 (patch)
tree273700d2e54964f089fa86e4b5b108f67e119683 /smoketest/scripts
parentb1ef7ba3e5f66d446cd83609b25e05ab47f92060 (diff)
downloadvyos-1x-b083d60102e5b955a7dda544e94bc92b21e619b6.tar.gz
vyos-1x-b083d60102e5b955a7dda544e94bc92b21e619b6.zip
vxlan: T5759: change default MTU from 1450 -> 1500 bytes
Found an odd behavior on Linux and the VyOS CLI implementation. If adding VXLAN interfaces using iproute2 the MTU differs depending on the creation syntax: ip -4 link add vxlan100 type vxlan dstport 4789 external df unset tos inherit \ ttl 16 nolearning vnifilter local 172.16.33.201 ip -4 link add vxlan200 type vxlan id 200 dstport 4789 local 172.16.33.201 dev eth0 ip -6 link add vxlan300 type vxlan id 300 dstport 4789 local 2001:db8:1::1 dev eth0 132: vxlan300: <BROADCAST,MULTICAST> mtu 1430 qdisc noop state DOWN group default qlen 1000 link/ether 4e:fb:e3:f5:d9:59 brd ff:ff:ff:ff:ff:ff 133: vxlan200: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000 link/ether 0e:4e:f4:76:59:3f brd ff:ff:ff:ff:ff:ff 134: vxlan100: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether ba:b6:b7:0c:b1:37 brd ff:ff:ff:ff:ff:ff VyOS always sets a default MTU of 1450 bytes which is correct for IPv4 p2p links or multicast, but invalid for IPv6 p2p. Also this will break EVPN deployments as ethernet bridges with MTU < 1500 bytes are less fun. Increase default MTU to 1500 bytes. Migrate old configurations to use 1450 bytes if not specified otherwise on the CLI. (cherry picked from commit 4a163b016333e58fee9d6ec6b53a09e0160b3213)
Diffstat (limited to 'smoketest/scripts')
-rw-r--r--smoketest/scripts/cli/base_interfaces_test.py3
-rwxr-xr-xsmoketest/scripts/cli/test_interfaces_vxlan.py15
2 files changed, 10 insertions, 8 deletions
diff --git a/smoketest/scripts/cli/base_interfaces_test.py b/smoketest/scripts/cli/base_interfaces_test.py
index 6862207e3..dfdfd3736 100644
--- a/smoketest/scripts/cli/base_interfaces_test.py
+++ b/smoketest/scripts/cli/base_interfaces_test.py
@@ -412,10 +412,9 @@ class BasicInterfaceTest:
for intf in self._interfaces:
base = self._base_path + [intf]
- self.cli_set(base + ['mtu', self._mtu])
-
for option in self._options.get(intf, []):
self.cli_set(base + option.split())
+ self.cli_set(base + ['mtu', self._mtu])
# check validate() - can not set low MTU if 'no-default-link-local'
# is not set on CLI
diff --git a/smoketest/scripts/cli/test_interfaces_vxlan.py b/smoketest/scripts/cli/test_interfaces_vxlan.py
index be1fa9d7f..18676491b 100755
--- a/smoketest/scripts/cli/test_interfaces_vxlan.py
+++ b/smoketest/scripts/cli/test_interfaces_vxlan.py
@@ -18,6 +18,7 @@ import unittest
from vyos.configsession import ConfigSessionError
from vyos.ifconfig import Interface
+from vyos.ifconfig import Section
from vyos.utils.network import get_bridge_fdb
from vyos.utils.network import get_interface_config
from vyos.utils.network import interface_exists
@@ -32,12 +33,13 @@ class VXLANInterfaceTest(BasicInterfaceTest.TestCase):
cls._base_path = ['interfaces', 'vxlan']
cls._options = {
'vxlan10': ['vni 10', 'remote 127.0.0.2'],
- 'vxlan20': ['vni 20', 'group 239.1.1.1', 'source-interface eth0'],
+ 'vxlan20': ['vni 20', 'group 239.1.1.1', 'source-interface eth0', 'mtu 1450'],
'vxlan30': ['vni 30', 'remote 2001:db8:2000::1', 'source-address 2001:db8:1000::1', 'parameters ipv6 flowlabel 0x1000'],
'vxlan40': ['vni 40', 'remote 127.0.0.2', 'remote 127.0.0.3'],
'vxlan50': ['vni 50', 'remote 2001:db8:2000::1', 'remote 2001:db8:2000::2', 'parameters ipv6 flowlabel 0x1000'],
}
cls._interfaces = list(cls._options)
+ cls._mtu = '1450'
# call base-classes classmethod
super(VXLANInterfaceTest, cls).setUpClass()
@@ -139,7 +141,7 @@ class VXLANInterfaceTest(BasicInterfaceTest.TestCase):
def test_vxlan_vlan_vni_mapping(self):
bridge = 'br0'
interface = 'vxlan0'
- source_interface = 'eth0'
+ source_address = '192.0.2.99'
vlan_to_vni = {
'10': '10010',
@@ -152,8 +154,7 @@ class VXLANInterfaceTest(BasicInterfaceTest.TestCase):
}
self.cli_set(self._base_path + [interface, 'parameters', 'external'])
- self.cli_set(self._base_path + [interface, 'parameters', 'vni-filter'])
- self.cli_set(self._base_path + [interface, 'source-interface', source_interface])
+ self.cli_set(self._base_path + [interface, 'source-address', source_address])
for vlan, vni in vlan_to_vni.items():
self.cli_set(self._base_path + [interface, 'vlan-to-vni', vlan, 'vni', vni])
@@ -189,11 +190,12 @@ class VXLANInterfaceTest(BasicInterfaceTest.TestCase):
def test_vxlan_neighbor_suppress(self):
bridge = 'br555'
interface = 'vxlan555'
- source_interface = 'eth0'
+ source_interface = 'dum0'
+
+ self.cli_set(['interfaces', Section.section(source_interface), source_interface, 'mtu', '9000'])
self.cli_set(self._base_path + [interface, 'parameters', 'external'])
self.cli_set(self._base_path + [interface, 'source-interface', source_interface])
-
self.cli_set(self._base_path + [interface, 'parameters', 'neighbor-suppress'])
# This must fail as this VXLAN interface is not associated with any bridge
@@ -223,6 +225,7 @@ class VXLANInterfaceTest(BasicInterfaceTest.TestCase):
self.assertTrue(tmp['linkinfo']['info_slave_data']['learning'])
self.cli_delete(['interfaces', 'bridge', bridge])
+ self.cli_delete(['interfaces', Section.section(source_interface), source_interface])
def test_vxlan_vni_filter(self):
interfaces = ['vxlan987', 'vxlan986', 'vxlan985']