[18.08] data-port + veth + linux bridge handling does not set up MTU properly
Bug #1791101 reported by
Chris MacNaughton
This bug affects 3 people
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| Charm Helpers |
Triaged
|
Medium
|
Unassigned | ||
| OpenStack Neutron Gateway Charm |
Triaged
|
Medium
|
Unassigned | ||
| OpenStack Neutron Open vSwitch Charm |
Triaged
|
Medium
|
Unassigned | ||
Bug Description
The file created to connect the veth to the bridge in https:/
pre-up ip link set veth-br0 mtu 9000
pre-up ip link set veth-br-ex mtu 9000
pre-up ip link set br0 mtu 9000
Note: A linux bridge interface MTU is set to the lowest MTU setting of any interface that is a member of that bridge. veth interfaces get 1500 setting from the linux kernel if not set explicitly which causes the linux bridge with MTU setting of 9000 to drop MTU to 1500.
| tags: | added: cpe-onsite |
| description: | updated |
| summary: |
- When attaching neutron-gateway to abridge onto a jumbo-framed network, - the veth is 1500 + [18.08] data-port + veth + linux bridge handling does not set up MTU + properly |
Revision history for this message
| James Page (james-page) wrote | #1 |
| Changed in charm-helpers: | |
| status: | New → Triaged |
| Changed in charm-neutron-gateway: | |
| status: | New → Triaged |
| Changed in charm-neutron-openvswitch: | |
| status: | New → Triaged |
| Changed in charm-helpers: | |
| importance: | Undecided → Medium |
| Changed in charm-neutron-gateway: | |
| importance: | Undecided → Medium |
| Changed in charm-neutron-openvswitch: | |
| importance: | Undecided → Medium |
Revision history for this message
| Chris MacNaughton (chris.macnaughton) wrote | #2 |
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Note that bridge adopts the lowest MTU of all connected devices, so does not need to be set.