[ovs-discuss] MAC learning table does not always update

Cheng Jin cheng at cs.umn.edu
Tue Mar 3 18:25:20 UTC 2015


Hi all,

I have a problem with updating OVS' MAC learning table, when it is in the
'standalone' mode running like a legacy Ethernet bridge.

The switch has an entry to a destination, including the destination MAC
(say, 00:00:00:00:00:01), an output port (say, 1), VLAN, and Age. However,
the switch sometimes does not update the entry, when it receives a packet
from the same destination (still 00:00:00:00:00:01) but from a new incoming
port (say, 2). Does someone know what may cause this issue?

The MAC learning table is supposed to be updated once receiving a packet.
Does OVS do some optimization to process the packets so that the learning
table may not get updated when the packet rate is high?

Thanks!
Cheng
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