a023f35549
Change-Id: I7d7dd17a7938d67627e817a6e5c6310c320e638c
2.8 KiB
2.8 KiB
OFAgent: Merge br-int and br-tun
https://blueprints.launchpad.net/neutron/+spec/ofagent-merge-bridges
merge br-int and br-tun and stop using OVS patch ports feature. this involves drastic flow table changes.
Problem description
ofagent aims to be portable among switch implementations. currently it uses some of OVS specific features. patch ports is one of them.
Proposed change
merge br-int and br-tun into a single bridge.
Alternatives
- give up and declare that tunnel support is only for OVS. this is not what we want to do.
- use veth pair instead. this is not ideal as it still requires multiple logical bridge feature. besides that, it likely involve some performance loss because patch ports is better optimized than veth pair.
Data model impact
none
REST API impact
none
Security impact
none
Notifications impact
none
Other end user impact
none
Performance Impact
because OVS patch ports hardly have negative performace effects for fast path, this change is not expected to improve performance.
Other deployer impact
when upgrading the agent, deployer might want to remove br-tun.
Developer impact
none
Implementation
Assignee(s)
- Primary assignee:
-
yamamoto
- Other contributors:
-
kakuma
Work Items
- design flow table. see flow_table for WIP design.
- implement it in ofagent neutron agent
- document the upgrade procedure
Dependencies
strictly speaking, none. but the following items are nice to have before this.
- ofagent-l2pop blueprint (our WIP implementation relies on this)
- matrohon's get_device_details-enhancement. or other way to obtain device's mac_address. (for example, make l2pop provide device-id for entries.) we want to use it for node local routing of packets.
Testing
- unit tests
- existing third party testing
Documentation Impact
- document the upgrade procedure
References
- WIP flow table for this blueprint https://wiki.openstack.org/wiki/Neutron/OFAgent/FlowTable
- WIP implementation of the above https://github.com/yamt/neutron/tree/ofagent-merge-bridges