Could someone pls help with this?
On Thursday, October 23, 2014, Shridhar Sahukar <
shridhar.sahu...@cyaninc.com> wrote:
> Hi,
>
> In our setup, we have a bunch of lxcs connected through a bridge. We have
> enabled STP on the bridge as there is a possibility of loop formation when
> we add a GRE interface onto the same bridge to connect with another host
> running with similar configuration.
>
> We are seeing that there is around 8 seconds of packet drop when a new lxc
> interface is added or when an existing interface is deleted. Looking at the
> 'ovs-ofctl show {bridge}' output seems to indicate that the packet drops
> correspond to the time at which the STP states change from
> STP_FORWARD->0->STP_LEARN->STP_FORWARD.
>
> We need STP running on on the GRE interface and not on other interface, so
> I tried to disable the STP on some of these ports by using "ovs-ofctl
> mod-port {BRIDGE} {PORT} no-stp" and "ovs-ofctl mod-port {BRIDGE} {PORT}
> no-receive-stp" commands, but I still see the port state transition to
> LEARN while adding or deleting an lxc port.
>
> We initially observed this behavior on 2.1.0 version and later verified
> that the behavior is same on 2.3.0 version as well.
>
> 1. Is it an expected behavior that there could be a packet drop when the
> topology changes and STP transitions through learning new topology?
>
> 2. Is it the right approach to use above mentioned "ovs-ofctl mod-port"
> command to disable STP on individual ports? Is there some other method to
> achieve the same? And Is it a bug that the ports are still going through
> STP state transitions even when STP is disabled on those ports?
>
> Please find below more information about our setup and output of some of
> the openvswitch commands:
>
> - We create a bridge in openvswitch with "ovs-vsctl add-br" command
> - LXCs create VETH pair of interfaces and adds the veth interface to the
> bridge using "ovs-vsctl add-port" command.
> - We have disabled stp on the bridge with "ovs-vsctl set bridge {BR}
> stp_enable=true" command
>
> ubuntu@ip-172-31-6-128:~$ *sudo ovs-vsctl show*
> 27a044fd-8d9f-4182-80c2-616345a5f737
> Bridge bpbr
> Port bpbr
> Interface bpbr
> type: internal
> Port vethYDEugn
> Interface vethYDEugn
> Port "vethi0bmKX"
> Interface "vethi0bmKX"
> Port "vethqyau0c"
> Interface "vethqyau0c"
> ovs_version: "2.1.0"
>
> ubuntu@ip-172-31-6-128:~$ *sudo ovs-ofctl show bpbr*
> OFPT_FEATURES_REPLY (xid=0x2): dpid:00007271972f0e41
> n_tables:254, n_buffers:256
> capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
> actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC SET_DL_DST
> SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST ENQUEUE
> 1(vethi0bmKX): addr:fe:89:a1:aa:d2:07
> config: 0
> state: STP_FORWARD
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> 2(vethYDEugn): addr:fe:3d:ae:14:21:7a
> config: 0
> state: STP_FORWARD
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> 3(vethqyau0c): addr:fe:da:4c:dc:52:05
> config: 0
> state: STP_FORWARD
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> LOCAL(bpbr): addr:72:71:97:2f:0e:41
> config: 0
> state: 0
> speed: 0 Mbps now, 0 Mbps max
> OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
>
> ubuntu@ip-172-31-6-128:~$ *sudo ovs-ofctl dump-flows bpbr*
> NXST_FLOW reply (xid=0x4):
> cookie=0x0, duration=12768.140s, table=0, n_packets=1822351,
> n_bytes=1322279602, idle_age=0, priority=0 actions=NORMAL
>
>
> Following output shows that the port goes into STP_LEARN state even when
> STP is disabled on the port:
>
>
>
> OFPT_FEATURES_REPLY (xid=0x2): dpid:00000610b651684e
> n_tables:254, n_buffers:256
> capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
> actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC SET_DL_DST
> SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST ENQUEUE
> 1(veth5l236C): addr:fe:f3:9b:6e:ec:11
> config: *NO_STP NO_RECV_STP*
> state: *STP_LEARN*
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> 2(vethnUQLH8): addr:fe:a1:ce:78:b7:d2
> config: NO_STP NO_RECV_STP
> state: STP_FORWARD
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> 3(vethFCs7UV): addr:fe:eb:68:63:72:2c
> config: *NO_STP NO_RECV_STP*
> state: *STP_LEARN*
> current: 10GB-FD COPPER
> speed: 10000 Mbps now, 0 Mbps max
> LOCAL(bpbr): addr:06:10:b6:51:68:4e
> config: 0
> state: 0
> speed: 0 Mbps now, 0 Mbps max
> OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
>
>
> Thanks,
> Shridhar
>
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