Hi all,
I use OpenBSD/i386 3.8 with GENERIC.MP.
I use a trunk interface based on 2 physical devices as you can see here :
$ ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33224
groups: lo
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6
fxp0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:02:a5:29:15:f0
trunk: trunkdev trunk0
media: Ethernet autoselect (100baseTX full-duplex)
status: active
inet6 fe80::202:a5ff:fe29:15f0%fxp0 prefixlen 64 scopeid 0x1
xl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:0a:5e:5a:c9:a4
trunk: trunkdev trunk0
media: Ethernet autoselect (100baseTX full-duplex)
status: active
inet6 fe80::20a:5eff:fe5a:c9a4%xl0 prefixlen 64 scopeid 0x2
pflog0: flags=0<> mtu 33224
pfsync0: flags=0<> mtu 1348
enc0: flags=0<> mtu 1536
trunk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:02:a5:29:15:f0
trunk: trunkproto roundrobin
trunkport xl0
trunkport fxp0 master
groups: trunk egress
media: Ethernet autoselect
status: active
inet 172.20.3.100 netmask 0xfffffe00 broadcast 172.20.3.255
Here's the dmesg (notice the xl0 strange message) :
OpenBSD 3.8 (GENERIC.MP) #298: Sat Sep 10 15:51:54 MDT 2005
[EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC.MP
cpu0: Intel Pentium III ("GenuineIntel" 686-class) 864 MHz
cpu0:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE
real mem = 2147049472 (2096728K)
avail mem = 1953083392 (1907308K)
using 4278 buffers containing 107454464 bytes (104936K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(00) BIOS, date 12/31/99, BIOS32 rev. 0 @ 0xf0000
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x2000
pcibios0: PCI BIOS has 7 Interrupt Routing table entries
pcibios0: PCI Interrupt Router at 000:15:0 ("ServerWorks ROSB4
SouthBridge" rev 0x00)
pcibios0: PCI bus #0 is the last bus
bios0: ROM list: 0xc0000/0x8000 0xc8000/0x4000! 0xcc000/0x800
0xe8000/0x6000 0xee000/0x2000!
mainbus0: Intel MP Specification (Version 1.4) (COMPAQ PROLIANT )
cpu0 at mainbus0: apid 1 (boot processor)
cpu0: apic clock running at 132 MHz
cpu1 at mainbus0: apid 0 (application processor)
cpu1: Intel Pentium III ("GenuineIntel" 686-class) 864 MHz
cpu1:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE
mainbus0: bus 0 is type PCI
mainbus0: bus 3 is type PCI
mainbus0: bus 9 is type ISA
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 11, 35 pins
ioapic0: misconfigured as apic 0, remapped to apic 8
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "ServerWorks CNB20LE Host" rev 0x05
pchb1 at pci0 dev 0 function 1 "ServerWorks CNB20LE Host" rev 0x05
pci1 at pchb1 bus 3
cac0 at pci0 dev 1 function 0 "Symbios Logic 53c1510" rev 0x02: apic 8
int 10 (irq 10) Compaq Integrated Array
scsibus0 at cac0: 1 targets
sd0 at scsibus0 targ 0 lun 0: <Compaq, RAID5 volume #, > SCSI2 0/direct fixed
sd0: 69455MB, 17432 cyl, 255 head, 32 sec, 512 bytes/sec, 142245120 sec total
fxp0 at pci0 dev 2 function 0 "Intel 82557" rev 0x08, i82559: apic 8
int 11 (irq 11), address 00:02:a5:29:15:f0
inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4
vga1 at pci0 dev 3 function 0 "ATI Mach64 GV" rev 0x7a
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
"Compaq Netelligent ASMC" rev 0x00 at pci0 dev 4 function 0 not configured
xl0 at pci0 dev 5 function 0 "3Com 3c905C 100Base-TX" rev 0x78: apic 8
int 5 (irq 5)xl0: reset didn't complete
, address 00:0a:5e:5a:c9:a4
exphy0 at xl0 phy 24: 3Com internal media interface
xl0: reset didn't complete
pcib0 at pci0 dev 15 function 0 "ServerWorks ROSB4 SouthBridge" rev 0x4f
pciide0 at pci0 dev 15 function 1 "ServerWorks OSB4 IDE" rev 0x00: DMA
atapiscsi0 at pciide0 channel 0 drive 0
scsibus1 at atapiscsi0: 2 targets
cd0 at scsibus1 targ 0 lun 0: <COMPAQ, CD-224E, 9.0B> SCSI0 5/cdrom removable
cd0(pciide0:0:0): using PIO mode 4, DMA mode 2
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
sysbeep0 at pcppi0
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
biomask 0 netmask 0 ttymask 0
pctr: 686-class user-level performance counters enabled
mtrr: Pentium Pro MTRR support
dkcsum: sd0 matches BIOS drive 0x80
root on sd0a
rootdev=0x400 rrootdev=0xd00 rawdev=0xd02
With this configuration, I can see small network pauses (1s) when
SSHing or downloading something through the local running squid. I
figure the trunk works this way : packet are sent through the member
interfaces with the trunk IP address and with the master NIC MAC@ and
packet are received on all trunk members thanks to the promiscuous
mode. As my NIC are plugged on the same L2 switch (for testing
purpose, maybe I'll use 2 different switch on a production
configuration), I suggest it bothers the switch with the same MAC@ on
2 ports. All error counters are null on this switch. I didn't
configure something like etherchannel or 802.3ad on these interface.
Does trunk operate this way ? Is there a way to avoid this phenomenon ?
Thank you,
Bruno.
