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41 lines
1.9 KiB
Plaintext
41 lines
1.9 KiB
Plaintext
Neutron ML2 l2 population Mechanism Drivers
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l2 population (l2pop) mechanism drivers implements the ML2 driver to improve
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open source plugins overlay implementations (VXLAN with Linux bridge and
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GRE/VXLAN with OVS). This mechanism driver is implemented in ML2 to propagate
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the forwarding information among agents using a common RPC API.
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More informations could be found on the wiki page [1].
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VXLAN Linux kernel:
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-------------------
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The VXLAN Linux kernel module provide all necessary functionalities to populate
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the forwarding table and local ARP responder tables. This module appears on
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release 3.7 of the vanilla Linux kernel in experimental:
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- 3.8: first stable release, no edge replication (multicast necessary),
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- 3.9: edge replication only for the broadcasted packets,
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- 3.11: edge replication for broadcast, multicast and unknown packets.
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Note: Some distributions (like RHEL) have backported this module on precedent
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kernel version.
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OpenvSwitch:
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------------
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The OVS OpenFlow tables provide all of the necessary functionality to populate
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the forwarding table and local ARP responder tables.
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A wiki page describe how the flow tables did evolve on OVS agents:
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- [2] without local ARP responder
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- [3] with local ARP responder. /!\ This functionality is only available since
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the development branch 2.1. It's possible
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to disable (enable by default) it through
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the flag 'arp_responder'. /!\
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Note: A difference persists between the LB and OVS agents when they are used
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with the l2-pop mechanism driver (and local ARP responder available). The
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LB agent will drop unknown unicast (VXLAN bridge mode), whereas the OVS
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agent will flood it.
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[1] https://wiki.openstack.org/wiki/L2population_blueprint
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[2] https://wiki.openstack.org/wiki/Ovs-flow-logic#OVS_flows_logic
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[3] https://wiki.openstack.org/wiki/Ovs-flow-logic#OVS_flows_logic_with_local_ARP_responder |