Creation/destroying vlans with parent em interface leads to link flap:
root# date;ifconfig vlan4000 create vlan 4000 vlandev em1 10.0.0.1/30;sleep
5;tail -7 /var/log/kern.log
Mon Dec 7 15:18:38 MSK 2009
Dec 7 15:18:38 <kern.crit> g kernel: vlan4000: bpf attached
Dec 7 15:18:38 <kern.crit> g kernel: em1: Link is Down
Dec 7 15:18:38 <kern.notice> g kernel: em1: link state changed to DOWN
Dec 7 15:18:38 <kern.notice> g kernel: vlan4000: link state changed to DOWN
Dec 7 15:18:42 <kern.crit> g kernel: em1: Link is up 1000 Mbps Full Duplex
Dec 7 15:18:42 <kern.notice> g kernel: em1: link state changed to UP
Dec 7 15:18:42 <kern.notice> g kernel: vlan4000: link state changed to UP
It's supermicro 5015B-MTB server.
e...@pci0:13:0:0: class=0x020000 card=0x108c15d9 chip=0x108c8086
rev=0x03 hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel Corporation 82573E Gigabit Ethernet Controller (Copper)
(82573E)'
class = network
subclass = ethernet
e...@pci0:15:0:0: class=0x020000 card=0x109a15d9 chip=0x109a8086
rev=0x00 hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel PRO/1000 PL Network Adaptor (82573L)'
class = network
subclass = ethernet
P.S. 7.2R em driver works as expected.
--
Oleg.
================================================================
=== Oleg Bulyzhin -- OBUL-RIPN -- OBUL-RIPE -- o...@rinet.ru ===
================================================================
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