[ovs-discuss] Open vSwitch with tap interface
Justin Pettit
jpettit at nicira.com
Thu Jul 19 01:00:21 UTC 2012
What does your flow table look like? You can find out by running "ovs-ofctl dump-flows mxu-br0". Can you also dump your kernel flow table? That's with "ovs-dpctl dump-flows mxu-br0".
--Justin
On Jul 18, 2012, at 5:48 PM, Milton Xu (mxu) wrote:
> Hi OVS experts,
>
> I am new to OVS and trying to replace Linux bridge (brctl) utility with OVS.
>
> Using Linux bridge, I have two VM’s based on QEMU/KVM using two tap interfaces tap0.mxu and tap1.mxu and they are connected thru my bridge mxu-br0:
>
> brctl show mxu-br0
> bridge name bridge id STP enabled interfaces
> mxu-br0 8000.6a403c9462ff no tap0.mxu
> tap1.mxu
>
>
>
> My two VM’s, mxu-br0, tap0.mxu and tap1.mxu are all on the same Liunx machine and you can see them all up so I can send ping btw my two VM’s without any problem.
>
> >ifconfig | more
> eth0 Link encap:Ethernet HWaddr 30:e4:db:c2:a1:a4
> inet addr:172.19.124.54 Bcast:172.19.124.255 Mask:255.255.255.0
> inet6 addr: fe80::32e4:dbff:fec2:a1a4/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:15000589 errors:0 dropped:870 overruns:0 frame:0
> TX packets:7831073 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:15172609160 (15.1 GB) TX bytes:2499636852 (2.4 GB)
> Memory:b3160000-b3180000
>
> eth1 Link encap:Ethernet HWaddr 30:e4:db:c2:a1:a5
> inet addr:21.255.255.253 Bcast:21.255.255.255 Mask:255.0.0.0
> inet6 addr: fe80::32e4:dbff:fec2:a1a5/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:2611 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:0 (0.0 B) TX bytes:241898 (241.8 KB)
> Memory:b3120000-b3140000
>
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> inet6 addr: ::1/128 Scope:Host
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:10098544920 errors:0 dropped:0 overruns:0 frame:0
> TX packets:10098544920 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:811112857751 (811.1 GB) TX bytes:811112857751 (811.1 GB)
>
> mxu-br0 Link encap:Ethernet HWaddr 6a:40:3c:94:62:ff
> inet6 addr: fe80::6840:3cff:fe94:62ff/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:0 (0.0 B) TX bytes:4101 (4.1 KB)
>
> tap0.mxu Link encap:Ethernet HWaddr 6a:40:3c:94:62:ff
> inet6 addr: fe80::6840:3cff:fe94:62ff/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:19 errors:0 dropped:0 overruns:0 frame:0
> TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:2742 (2.7 KB) TX bytes:8854 (8.8 KB)
>
> tap1.mxu Link encap:Ethernet HWaddr ee:0d:fe:17:53:5d
> inet6 addr: fe80::ec0d:feff:fe17:535d/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:21 errors:0 dropped:0 overruns:0 frame:0
> TX packets:24 errors:0 dropped:1 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:2598 (2.5 KB) TX bytes:4450 (4.4 KB)
>
>
> Now I use OVS to create bridge mxu-ovs-br1:
>
> >ovs-vsctl show
> 92076a61-e1bc-4610-997e-22cc173891ab
> Bridge "mxu-ovs-br1"
> Port "mxu-ovs-br1"
> Interface "mxu-ovs-br1"
> type: internal
> Port "tap1.mxu"
> Interface "tap1.mxu"
> Port "tap0.mxu"
> Interface "tap0.mxu"
>
> I see tap0.mxu and tap1.mxu are up but not bridge mxu-ovs-br1 and it seems that I could not use ifconfig to bring up mxu-ovs-br1
> (not the same as the Linux bridge utility). With OVS as my soft switch, my two VMs (still the same, identical QEMU/KVM based ) could not ping each other.
>
> Does anybody know whether this is because OVS does not work with tap interface (created using tunctl utility) or I did not configure everything correctly?
> My OVS is built from openvswitch-1.6.1.
>
> > ifconfig | more
> eth0 Link encap:Ethernet HWaddr 58:8d:09:08:9a:04
> inet addr:172.28.12.88 Bcast:172.28.12.255 Mask:255.255.255.0
> inet6 addr: fe80::5a8d:9ff:fe08:9a04/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:3512603 errors:0 dropped:1265 overruns:0 frame:0
> TX packets:6108402 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:567115246 (567.1 MB) TX bytes:9147031239 (9.1 GB)
> Memory:b1960000-b1980000
>
>
> tap0.mxu Link encap:Ethernet HWaddr 4a:ad:a0:91:81:f9
> inet6 addr: fe80::48ad:a0ff:fe91:81f9/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:402 errors:0 dropped:0 overruns:0 frame:0
> TX packets:62 errors:0 dropped:1 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:81538 (81.5 KB) TX bytes:10343 (10.3 KB)
>
> tap1.mxu Link encap:Ethernet HWaddr ee:dc:21:63:c0:79
> inet6 addr: fe80::ecdc:21ff:fe63:c079/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:401 errors:0 dropped:0 overruns:0 frame:0
> TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:80879 (80.8 KB) TX bytes:5762 (5.7 KB)
>
>
> Thanks in advance,
>
> Milton
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