ovs-ofctl snoop <bridge>

Owned by Tracy Yang
Nov 13, 2023
2 min read

ovs-ofctl snoop br0

This command snoops the bridge for open flow messages exchanged with the controller. It can be used to debug flow installations, modifications and packet_in and packet_out messages on the bridge. This command executes in a continuous loop. ^C should be used to break the display output.

 

 

admin@SpineA-OVS$ovs-ofctl snoop br0
OFPT_ECHO_REQUEST (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_ECHO_REPLY (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_ECHO_REQUEST (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_ECHO_REPLY (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_PACKET_IN (OF1.3) (xid=0x0): cookie=0x0 total_len=1516 in_port=1 (via action) data_len=1516 (unbuffered)
udp,metadata=0,in_port=0,dl_vlan=100,dl_vlan_pcp=0,dl_src=00:0c:29:fd:75:ae,dl_dst=00:0c:29:70:2e:b8,nw_src=100.0.0.10,nw_dst=100.0.0.20,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=59431,tp_dst=5001 udp_csum:cf33
OFPT_PACKET_OUT (OF1.3) (xid=0x4c): in_port=CONTROLLER actions=output:2 data_len=1516
udp,metadata=0,in_port=0,dl_vlan=100,dl_vlan_pcp=0,dl_src=00:0c:29:fd:75:ae,dl_dst=00:0c:29:70:2e:b8,nw_src=100.0.0.10,nw_dst=100.0.0.20,nw_tos=0,nw_ecn=0,nw_ttl=64,tp_src=59431,tp_dst=5001 udp_csum:cf33
OFPT_FLOW_MOD (OF1.3) (xid=0x4d): ADD priority=25000,in_port=1,dl_vlan=100,dl_src=00:0c:29:fd:75:ae,dl_dst=00:0c:29:70:2e:b8 cookie:0xc80093dc00010068 idle:300 out_port:0 send_flow_rem actions=output:2
OFPT_BARRIER_REQUEST (OF1.3) (xid=0x4e):
OFPT_BARRIER_REPLY (OF1.3) (xid=0x4e):
OFPT_ECHO_REQUEST (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_ECHO_REPLY (OF1.3) (xid=0x0): 0 bytes of payload
OFPT_PACKET_IN (OF1.3) (xid=0x0): cookie=0x0 total_len=64 in_port=2 (via action) data_len=64 (unbuffered)
arp,metadata=0,in_port=0,dl_vlan=100,dl_vlan_pcp=0,dl_src=00:0c:29:70:2e:b8,dl_dst=00:0c:29:fd:75:ae,arp_spa=100.0.0.20,arp_tpa=100.0.0.10,arp_op=2,arp_sha=00:0c:29:70:2e:b8,arp_tha=00:0c:29:fd:75:ae
OFPT_PACKET_OUT (OF1.3) (xid=0x4f): in_port=CONTROLLER actions=output:1 data_len=64
arp,metadata=0,in_port=0,dl_vlan=100,dl_vlan_pcp=0,dl_src=00:0c:29:70:2e:b8,dl_dst=00:0c:29:fd:75:ae,arp_spa=100.0.0.20,arp_tpa=100.0.0.10,arp_op=2,arp_sha=00:0c:29:70:2e:b8,arp_tha=00:0c:29:fd:75:ae
OFPT_FLOW_MOD (OF1.3) (xid=0x50): ADD priority=25000,in_port=2,dl_vlan=100,dl_src=00:0c:29:70:2e:b8,dl_dst=00:0c:29:fd:75:ae cookie:0xc800362b00010069 idle:300 out_port:0 send_flow_rem actions=output:1
OFPT_BARRIER_REQUEST (OF1.3) (xid=0x51):
OFPT_BARRIER_REPLY (OF1.3) (xid=0x51):
OFPT_ECHO_REQUEST (OF1.3) (xid=0x0): 0 bytes of payload

 

 

In case of error conditions, a hex dump of the erroneous packet is displayed.

admin@XorPlus$ovs-ofctl snoop br0



OFPT_PACKET_OUT (OF1.3) (xid=0x375f4): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375f5): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x375f6): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375f7): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x375f8): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375f9): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x375fa): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375fb): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x375fc): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375fd): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x375fe): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x375ff): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPST_PORT request (OF1.3) (xid=0x26): port_no=ANY
OFPST_PORT reply (OF1.3) (xid=0x26): 4 ports
  port  1: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=0, bytes=0, drop=0, errs=0, coll=0
           duration=604176.668s
  port  2: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=0, bytes=0, drop=0, errs=0, coll=0
           duration=604121.342s
  port  3: rx pkts=0, bytes=0, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=0, bytes=0, drop=0, errs=0, coll=0
           duration=604091.091s
  port LOCAL: rx pkts=8, bytes=816, drop=0, errs=0, frame=0, over=0, crc=0
           tx pkts=0, bytes=0, drop=0, errs=0, coll=0
           duration=934668.169s
OFPST_FLOW request (OF1.3) (xid=0x37601): 
OFPST_FLOW reply (OF1.3) (xid=0x37601):
 cookie=0x1f00007eaab36a, duration=836.005s, table=0, n_packets=n/a, n_bytes=0, send_flow_rem priority=40000,arp actions=CONTROLLER:65535
 cookie=0x1f00007eaab36a, duration=836.005s, table=0, n_packets=n/a, n_bytes=0, send_flow_rem priority=5,arp actions=CONTROLLER:65535
 cookie=0x1f00007eaa9ce4, duration=836.006s, table=0, n_packets=n/a, n_bytes=0, send_flow_rem priority=5,ip actions=CONTROLLER:65535
 cookie=0x1f00007ccd1ab0, duration=836.006s, table=0, n_packets=n/a, n_bytes=0, send_flow_rem priority=40000,dl_type=0x88cc actions=CONTROLLER:65535
 cookie=0x1f00007cced5a6, duration=836.006s, table=0, n_packets=n/a, n_bytes=0, send_flow_rem priority=40000,dl_type=0x8942 actions=CONTROLLER:65535
OFPT_FLOW_MOD (OF1.3) (xid=0x0): ***decode error: OFPBMC_BAD_PREREQ***
OFPT_ERROR (OF1.3) (xid=0x0): OFPBMC_BAD_PREREQ
OFPT_FLOW_MOD (OF1.3) (xid=0x0):
(***truncated to 64 bytes from 88***)
00000000  04 0e 00 58 00 00 00 00-00 1f 00 00 a5 d7 3f 26 |...X..........?&|
00000010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 05 |................|
00000020  ff ff ff ff ff ff ff ff-ff ff ff ff 00 01 00 00 |................|
00000030  00 01 00 10 80 00 19 08-e0 00 00 00 f0 00 00 00 |................|
OFPT_PACKET_OUT (OF1.3) (xid=0x37604): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x37605): in_port=CONTROLLER actions=output:1 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x37606): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x37607): in_port=CONTROLLER actions=output:2 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPT_PACKET_OUT (OF1.3) (xid=0x37608): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=01:23:20:00:00:01,dl_type=0x88cc
OFPT_PACKET_OUT (OF1.3) (xid=0x37609): in_port=CONTROLLER actions=output:3 data_len=81
metadata=0,in_port=0,vlan_tci=0x0000,dl_src=de:ad:be:ef:ba:11,dl_dst=ff:ff:ff:ff:ff:ff,dl_type=0x8942
OFPST_GROUP request (OF1.3) (xid=0x3e6b): group_id=ALL
OFPST_GROUP reply (OF1.3) (xid=0x3e6b):
OFPST_GROUP_DESC request (OF1.3) (xid=0x3e6c): group_id=ALL
OFPST_GROUP_DESC reply (OF1.3) (xid=0x3e6c):
^C2015-09-15T17:36:40Z|00001|fatal_signal|WARN|terminating with signal 2 (Interrupt)

 

 

 

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