Hi,
I am trying to interconnect several VMs and physical server, using ovs
and physicals switches.
An example :
2 ovs bridge (on separate physical server, interconnected with gre) with
each 2 virtual interface (vm) and a vlan interface (eth1.140) ; both
eth1 are directly connected to a physical switch (cisco 3750). I will
try a schema :
vm1-2 vm3-4
_____ gre _____
|_ovs_|-----|_ovs_|
_|_______|_
|___3750____|
|
|
physical server
The problem is with spanning tree. STP with ovs works well (there is one
root bridge), but 3750 is also root. It seems there is 2 separate
spanning tree domain.
Using tcpdump, it seems they don't use the same protocol :
16:08:28.094021 00:19:56:72:ce:ad > 01:00:0c:cc:cc:cd, ethertype 802.1Q
(0x8100), length 68: vlan 140, p 0, LLC, dsap SNAP (0xaa) Individual,
ssap SNAP (0xaa) Command, ctrl 0x03: oui Cisco (0x00000c), pid PVST
(0x010b): STP 802.1d, Config, Flags [none], bridge-id
708c.00:19:56:72:ce:80.802d, length 42
16:08:28.293259 00:21:5a:d4:15:31 > 01:80:c2:00:00:00, ethertype 802.1Q
(0x8100), length 56: vlan 140, p 0, LLC, dsap STP (0x42) Individual,
ssap STP (0x42) Command, ctrl 0x03: STP 802.1d, Config, Flags [none],
bridge-id 8000.00:21:5a:d4:15:31.8004, length 35
I didn't find any way to use the same spanning tree protocol.
Am i wrong about this conf ? Any idea is welcome ...
Thank you.
Regards,
Maxime
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