yahoo-eng-team team mailing list archive

[Attila Fazekas <afazekas@xxxxxxxxxx>]

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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