> I enabled bridge module in RH 7.3 with two Ethernet interface (eth0 and
eth1).  After bridge configuration (by brctl), I immediately started the
DHCP client (dhcpcd) to request IP from DHCP server . However, the DHCP
packet will be blocked for a period (about 30 seconds). By capturing from
sniffer, only BRIDGE protocol could be seen during this period.
>
> Is this a normal scenario or abnormal?

30 second is like the default time for the spanning-tree to get from
listening to learning and learning to forwarding.
This can be avoided by disabling the spanning-tree (sometime dangerous)
or by changing the forwarding delay (currently 15 sec in your case) but it
only work if you are the root bridge of the switched network.

David GLAUDE

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