Public bug reported:
Neutron at the moment have very limited capabilities for handling in
tenant network multicast/unknown/broadcast traffic.
Not just the ARP/DHCP traffic need to be considered, for example
applications like inifinispan can and prefers to use multicast for
communication.
vxlan is designed to be usable together with udp multicast, so instead of
having the sender node to send high number of uni-cast packet flood to every
possible node on every BUM frame.
The physical switches/routers nowadays able to handle even 32k multi-cast
groups.
If we have more virtual networks than the switch is able to handle
several network could share on the same mcast
group.(mcast_addr[avaliable_mcast_addrs modulo VNI])
Later this could be make smarter or could be combined with other packet
replication strategies.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1377203
Title:
Allow to multiple mullitcast group for handling the BUM traffic in
tenant networks with vxlan
Status in OpenStack Neutron (virtual network service):
New
Bug description:
Neutron at the moment have very limited capabilities for handling in
tenant network multicast/unknown/broadcast traffic.
Not just the ARP/DHCP traffic need to be considered, for example
applications like inifinispan can and prefers to use multicast for
communication.
vxlan is designed to be usable together with udp multicast, so instead of
having the sender node to send high number of uni-cast packet flood to every
possible node on every BUM frame.
The physical switches/routers nowadays able to handle even 32k multi-cast
groups.
If we have more virtual networks than the switch is able to handle
several network could share on the same mcast
group.(mcast_addr[avaliable_mcast_addrs modulo VNI])
Later this could be make smarter or could be combined with other
packet replication strategies.
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https://bugs.launchpad.net/neutron/+bug/1377203/+subscriptions
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