From: discuss [] On Behalf Of zhi
Sent: Thursday, October 13, 2016 11:29 AM
Subject: [ovs-discuss] VXLAN doesn't work in OVS-DPDK

hi, all

I configured native tunneling by this guide[1]. And follow this guide[2] to 
install OVS-DPDK. The OVS version is 2.6.0. The DPDK version is dpdk-16.07.

My local Linux environment is CentOS 7.1.1503 and the kernel version is 

And the network topology shows below:
[内嵌图片 1]
And the OVS info shows :

[root@host172 ~]# ovs-vsctl show
    Bridge br-int
        fail_mode: standalone
        Port "vxlan-001"
            Interface "vxlan-001"
                type: vxlan
                options: {local_ip="", remote_ip=""}
        Port "vm_port0"
            Interface "vm_port0"
                type: dpdkvhostuser
        Port br-int
            Interface br-int
                type: internal
    Bridge "br-phy1"
        fail_mode: standalone
        Port "dpdk0"
            Interface "dpdk0"
                type: dpdk
        Port "br-phy1"
            Interface "br-phy1"
                type: internal

[root@host172 ~]# ip a |grep br-phy1
78: br-phy1: <BROADCAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state 
UNKNOWN qlen 500
    inet<> scope global br-phy1

[root@host172 src]# ovs-ofctl dump-flows br-phy1
NXST_FLOW reply (xid=0x4):
 cookie=0x0, duration=6031.989s, table=0, n_packets=416732693, 
n_bytes=42512875415, idle_age=0, actions=NORMAL
[root@host172 src]# ovs-ofctl dump-flows br-int
NXST_FLOW reply (xid=0x4):
 cookie=0x0, duration=5429.701s, table=0, n_packets=0, n_bytes=0, 
idle_age=5429, actions=NORMAL

Here is the problem!

Why is there no matched packets and bytes in OVS bridge br-int ?

How does the bridge br-int receive VXLAN packets?

As far as I know, physical nic "eth1" is handled by DPDK. I add a dpdk0 port ( 
represent the physical nic "eth1" ) into OVS bridge br-phy1. And there is a 
vxlan port named "vxlan-001" in OVS bridge br-int. So the OVS bridge br-int can 
receive the vxlan packets from br-phy1 by linux kernel stack. Does my thought 
right? If yes, why does the bridge br-int can not receive any packets?
[Sugesh] Native tunneling doesn’t use any kernel stack for the packet 
forwarding. Everything happening at the userspace.
Have you checked the tunnel arp and route entries? Its mentioned in the debug 
section of the same document.
Did you try generating traffic from the VM ??
Please have a look at the statistics at the datapath as well. You can use the 
command ovs-appctl dpctl/show –s netdev@ovs-netdev

BTW, I can not see any packet changes by using " ifconfig br-phy1 |grep 'RX 
packets'  "  when I add the IP "" into bridge br-phy1. And I can 
see the packet changes when I remove the IP address from bridge br-phy1. Could 
someone tell me the reason?

Zhi Chang

discuss mailing list

Reply via email to