I set up openstack with one control node and one compute node with vxlan.
my problem is that the instance in compute node always failed to get IP
address by DHCP. I checked ovs flows and cannot figure out what the problem
is. here is what I saw
$ovs-vsctl show
Manager "tcp:172.22.11.43:6640"
is_connected: true
Bridge br-int
Controller "tcp:172.22.11.43:6633"
is_connected: true
fail_mode: secure
Port "tap766671cd-d8"
tag: 1
Interface "tap766671cd-d8"
Port br-int
Interface br-int
type: internal
Port patch-tun
Interface patch-tun
type: patch
options: {peer=patch-int}
Port "vxlan-172.31.0.125"
Interface "vxlan-172.31.0.125"
type: vxlan
options: {key=flow, local_ip="172.22.11.43",
remote_ip="172.31.0.125"}
Bridge br-tun
Port patch-int
Interface patch-int
type: patch
options: {peer=patch-tun}
Port "vxlan-ac1f007d"
Interface "vxlan-ac1f007d"
type: vxlan
options: {in_key=flow, local_ip="172.22.11.43",
out_key=flow, remote_ip="172.31.0.125"}
Port br-tun
Interface br-tun
type: internal
ovs_version: "2.1.90"
$ ovs-ofctl dump-flows br-int -O OpenFlow13
OFPST_FLOW reply (OF1.3) (xid=0x2):
cookie=0x0, duration=2294.917s, table=0, n_packets=9, n_bytes=1434,
send_flow_rem in_port=2,dl_src=fa:16:3e:d6:ee:31
actions=set_field:0x3e9->tun_id,goto_table:10
cookie=0x0, duration=2285.698s, table=0, n_packets=0, n_bytes=0,
send_flow_rem priority=8192,in_port=2 actions=drop
cookie=0x0, duration=2264.881s, table=0, n_packets=0, n_bytes=0,
send_flow_rem tun_id=0x3e9,in_port=3 actions=goto_table:20
cookie=0x0, duration=3133.421s, table=0, n_packets=0, n_bytes=0,
send_flow_rem dl_type=0x88cc actions=CONTROLLER:56
cookie=0x0, duration=2272.421s, table=10, n_packets=5, n_bytes=650,
send_flow_rem priority=8192,tun_id=0x3e9 actions=goto_table:20
cookie=0x0, duration=2262.715s, table=10, n_packets=4, n_bytes=784,
send_flow_rem
priority=16384,tun_id=0x3e9,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00
actions=output:3,goto_table:20
cookie=0x0, duration=2267.424s, table=20, n_packets=0, n_bytes=0,
send_flow_rem priority=8192,tun_id=0x3e9 actions=drop
cookie=0x0, duration=2281.314s, table=20, n_packets=0, n_bytes=0,
send_flow_rem tun_id=0x3e9,dl_dst=fa:16:3e:d6:ee:31 actions=output:2
cookie=0x0, duration=2275.604s, table=20, n_packets=9, n_bytes=1434,
send_flow_rem
priority=16384,tun_id=0x3e9,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00
actions=output:2
I think in table 10, the DHCP request is output to port 3 which is of type
vxlan and the host will send out an UDP packet to remote host. I tried to
use tcpdump to capture the vxlan packet but saw nothing. Could anybody
advise what's wrong here and how I should proceed to fix the problem?
Thanks.
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