Hello,
I am attempting to make an example using RYU and Openvswitch following
http://ryu.readthedocs.io/en/latest/writing_ryu_app.html
In this example, all packets are flooded to all other ports,
which makes the switch working as a hub.
I installed Openvswitch on a linux virtual machine with 6 NICs, which are
named as eth{0..5}. eth0 is used for out-of-band controlling,
eth{1..5} is used to connect to 5 other virtual machines by using
the socket network provided by QEMU.
The other virtual machines have IP address of 10.1.1.{1..5}
I used following command to setup the switch:
ovs-vsctl add-br br0 \
-- set bridge br0 other-config:datapath-id=0000000000000001 \
-- add-port br0 eth1 -- set interface eth1 ofport_request=1 \
-- add-port br0 eth2 -- set interface eth2 ofport_request=2 \
-- add-port br0 eth3 -- set interface eth3 ofport_request=3 \
-- add-port br0 eth4 -- set interface eth4 ofport_request=4 \
-- add-port br0 eth5 -- set interface eth5 ofport_request=5 \
-- set-controller br0 tcp:192.168.2.201:6653 \
-- set controller br0 connection-mode=out-of-band \
-- set bridge br0 fail-mode=secure
The RYU controller is setup via following command, run on 192.168.2.201:
ryu-manager ./flood.py --ofp-tcp-listen-port 6653
When I ping 10.1.1.2 from 1.1.1.1, since the switch floods all packets,
the ping is expected to be responsed. But I always got
'From 10.1.1.1 icmp_seq=1 Destination Host Unreachable'
I reviewed the log of openvswitch and found following message:
2018-04-29T06:49:29.448Z|00016|poll_loop(handler5)|DBG|wakeup due to
[POLLIN] on fd 21 (unknown anon_inode:[eventpoll]) at
lib/dpif-netlink.c:2769
2018-04-29T06:49:29.448Z|00017|netlink_socket(handler5)|DBG|nl_sock_recv__
(Success): nl(len:186, type=24(ovs_packet), flags=0, seq=0,
pid=0,genl(cmd=2,version=1)
2018-04-29T06:49:29.449Z|00018|dpif(handler5)|DBG|system@ovs-system:
action upcall:
recirc_id(0),dp_hash(0),skb_priority(0),in_port(4),skb_mark(0),ct_state(0),eth(src=52:54:00:4a:59:8f,dst=ff:ff:ff:ff:ff:ff),eth_type(0x0806),arp(sip=10.1.1.1,tip=10.1.1.2,op=1,sha=52:54:00:4a:59:8f,tha=00:00:00:00:00:00)
arp,vlan_tci=0x0000,dl_src=52:54:00:4a:59:8f,dl_dst=ff:ff:ff:ff:ff:ff,arp_spa=10.1.1.1,arp_tpa=10.1.1.2,arp_op=1,arp_sha=52:54:00:4a:59:8f,arp_tha=00:00:00:00:00:00
2018-04-29T06:49:29.449Z|00019|poll_loop(handler5)|DBG|wakeup due to
0-ms timeout at ofproto/ofproto-dpif-upcall.c:747
2018-04-29T06:49:29.449Z|00767|poll_loop|DBG|wakeup due to [POLLIN]
on fd 39 (FIFO pipe:[4003]) at vswitchd/bridge.c:385 (0% CPU usage)
2018-04-29T06:49:29.449Z|00768|vconn|DBG|tcp:192.168.2.201:6653:
sent (Success): OFPT_PACKET_IN (xid=0x0): total_len=42 in_port=1 (via
no_match) data_len=42 (unbuffered)
arp,vlan_tci=0x0000,dl_src=52:54:00:4a:59:8f,dl_dst=ff:ff:ff:ff:ff:ff,arp_spa=10.1.1.1,arp_tpa=10.1.1.2,arp_op=1,arp_sha=52:54:00:4a:59:8f,arp_tha=00:00:00:00:00:00
2018-04-29T06:49:29.450Z|00769|poll_loop|DBG|wakeup due to [POLLIN]
on fd 36 (192.168.2.101:48530<->192.168.2.201:6653) at
lib/stream-fd.c:157 (0% CPU usage)
2018-04-29T06:49:29.451Z|00770|vconn|DBG|tcp:192.168.2.201:6653:
received: OFPT_PACKET_OUT (xid=0xf2daa020): in_port=1 actions=FLOOD
data_len=0
2018-04-29T06:49:29.451Z|00771|netlink_socket|DBG|nl_sock_transact_multiple__
(Success): nl(len:100, type=24(ovs_packet), flags=1[REQUEST], seq=f3,
pid=2562,genl(cmd=3,version=1)
2018-04-29T06:49:29.451Z|00772|netlink_socket|DBG|nl_sock_recv__
(Success): nl(len:120, type=2(error), flags=0, seq=f3, pid=2562
error(-34(Numerical result out of range), in-reply-to(nl(len:100,
type=24(ovs_packet), flags=1[REQUEST], seq=f3, pid=2562))
2018-04-29T06:49:29.451Z|00773|netlink_socket|DBG|received NAK
error=0 (Numerical result out of range)
2018-04-29T06:49:29.451Z|00774|dpif|WARN|system@ovs-system: execute
6,2,1,3,5 failed (Numerical result out of range) on packet
vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,dl_type=0x0000
with metadata
skb_priority(0),skb_mark(0),in_port(4) mtu 0
The module is provided by linux kernel 4.9.76 and the openvswitch software
is 2.8.2.
So what am I doing wrong?
Thanks & Regards,
Lifan Su
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