os-vif

  1. Bug #1837252
  2. Comment #20

Comment 20 for bug 1837252

Revision history for this message
Jeremy Stanley (fungi) wrote : Re: IFLA_BR_AGEING_TIME of 0 causes flooding across bridges

After discussing this with Sean in #openstack-nova on Freenode, it seems this bug was introduced in commit 1f6fed6 which first appeared in os-vif 1.15.0, making the corrected version list...

Affects: >=1.15.0<1.15.2, 1.16.0

Also, seeking clarification on the exact nature of the flooding, it seems that IFLA_BR_AGEING_TIME=0 disabling learning results in the bridge table containing only local MACs (those which are added explicitly). Flooding then happens when a frame transiting the bridge, most likely one emitted from a local instance, is addressed for a non-local MAC and is then forwarded to all local ports as well as the uplinks to the host-external network, because linuxbridge doesn't know where that MAC resides. Does this summary accurately characterize the scenario?