I test multicast on openstack. I use external Router in this test.

Openstack Environment:

Havana (ML2 + OVS)

  

Test Environment:

VM1 is in Vlan 850. VM2,VM3,VM4 are in Vlan 820.

VM2 and VM3 are on the same compute node ci91szcmp003 , VM1 and VM4 are on another compute node ci91szcmp004.

Here is the topology:

The security Group I'm using is as following, UDP 5001 is the port which I used to test Multicast Packet:

Test Tool:

I use iperf to test Multicast. You can easily install this tool on CentOS with the following command:

yum install iperf

If you do not know how to use this tool, you can see "man iperf" for more detail.

  

Simulate Multicast Sender with the following command:

iperf -c 224.1.1.1 -u -T 32 -t 3 -i 1

Simulate Multicast Receiver with the following command:

iperf -s -u -B 224.1.1.1 -i 1

Test Case and Result:

VMs in the same Vlan

Case #1:

VM2 send multicast packet. VM3 and VM4 do not join the Multicast Group, use tcpdump to see if they can receive Multicast packets.

Multicast packet flow from VM2 to VM3 is VM2 -> OVS -> VM3, as following：

Multicast packet flow from VM2 to VM4 is VM2 -> OVS -> Phy Switch -> OVS -> VM3, as following：

Result and Log:

On VM2 I send multicast packet:

[root@VM2 ~]# iperf -c 224.1.1.1 -u -T 32 -t 3 -i 1

------------------------------------------------------------

Client connecting to 224.1.1.1, UDP port 5001

Sending 1470 byte datagrams

Setting multicast TTL to 32

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 10.224.159.146 port 54457 connected with 224.1.1.1 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0- 1.0 sec   129 KBytes  1.06 Mbits/sec

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec

[  3] Sent 269 datagrams

On VM3, I did not join the Multicast Group and use tcpdump to dump packet:

[root@VM3 ~]# netstat -g -n

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.0.0.1

[root@VM3 ~]# tcpdump -i eth0 host 224.1.1.1

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

04:45:59.213678 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.224902 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.236114 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.247387 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.258611 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.269744 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

04:45:59.281011 IP 10.224.159.146.54457 > 224.1.1.1.commplex-link: UDP, length 1470

...

On VM4, I did not join the Multicast Group and use tcpdump to dump packet:

[root@VM4 ~]# netstat -g -n

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.0.0.1

[root@VM4 ~]# tcpdump -i eth0 host 224.1.1.1

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

We can see that VM2 and VM3 are in the same Vlan and on the same compute node. They are connected with Openvswitch.Openvswitch do not support Multicast snooping. So it will broadcast all the Multicast packets. So Even VM3 did not join the multicast
group, it can also receive the Multicast packets.And at the same time, We can see VM4 did not receive the Multicast packet because VM4 is on another Compute node. The two compute nodes are connected to a physical switch. And the physical Switch support igmp
snooping and it will not broadcast the multicast packet to other compute nodes.

  

Case #2:

VM2 send multicast packet. VM4 join the Multicast Group to see if it can receive Multicast packets.

Result and Log:

On VM2 I send multicast packet:

[root@VM2 ~]# iperf -c 224.1.1.1 -u -T 32 -t 3 -i 1

------------------------------------------------------------

Client connecting to 224.1.1.1, UDP port 5001

Sending 1470 byte datagrams

Setting multicast TTL to 32

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 10.224.159.146 port 35844 connected with 224.1.1.1 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0- 1.0 sec   129 KBytes  1.06 Mbits/sec

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec

[  3] Sent 269 datagrams

On VM4 I receive multicast packet:

[root@VM4 ~]# iperf -s -u -B 224.1.1.1 -i 1

------------------------------------------------------------

Server listening on UDP port 5001

Binding to local address 224.1.1.1

Joining multicast group  224.1.1.1

Receiving 1470 byte datagrams

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 224.1.1.1 port 5001 connected with 10.224.159.146 port 35844

[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams

[  3]  0.0- 1.0 sec   128 KBytes  1.05 Mbits/sec   0.027 ms    0/   89 (0%)

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec   0.026 ms    0/   89 (0%)

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec   0.018 ms    0/   89 (0%)

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec   0.019 ms    0/  269 (0%)

[root@VM4 ~]# netstat -n -g

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.1.1.1

eth0            1      224.0.0.1

We can see that VM2 and VM4 are in the same Vlan and on different compute nodes. After VM4 join the Multicast Group, VM2 send the packets and VM4 can receive the multicast packets.

  

VMs in different Vlan and use external Router

Case #3:

VM1 send Multicast packet. VM2 and VM4 do not join the Multicast Group, tcpdump to see if they can receive Multicast packets.

Multicast packet flow from VM1 to VM2 is VM1 -> OVS -> Phy Switch -> Phy Router -> Phy Switch -> OVS -> VM2, as following：

Multicast packet flow from VM1 to VM4 is VM1 -> OVS -> Phy Switch -> Phy Router -> Phy Switch -> OVS -> VM4, as following：

Result and Log:

[root@VM1 ~]# iperf -c 224.1.1.1 -u -T 32 -t 3 -i 1

------------------------------------------------------------

Client connecting to 224.1.1.1, UDP port 5001

Sending 1470 byte datagrams

Setting multicast TTL to 32

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 10.224.148.94 port 60820 connected with 224.1.1.1 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0- 1.0 sec   129 KBytes  1.06 Mbits/sec

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec

[  3] Sent 269 datagrams

[root@VM2 ~]# netstat -n -g

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.0.0.1

[root@VM2 ~]# tcpdump -i eth0 host 224.1.1.1

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

[root@VM4 ~]# netstat -g -n

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.0.0.1

[root@VM4 ~]# tcpdump -i eth0 host 224.1.1.1

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode

listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

Case #4:

VM1 send Multicast packet. VM2 join the Multicast Group to see if it can receive Multicast packets.

Result and Log:

[root@VM1 ~]# iperf -c 224.1.1.1 -u -T 32 -t 3 -i 1

------------------------------------------------------------

Client connecting to 224.1.1.1, UDP port 5001

Sending 1470 byte datagrams

Setting multicast TTL to 32

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 10.224.148.94 port 41301 connected with 224.1.1.1 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0- 1.0 sec   129 KBytes  1.06 Mbits/sec

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec

[  3] Sent 269 datagrams

[root@VM2 ~]# iperf -s -u -B 224.1.1.1 -i 1

------------------------------------------------------------

Server listening on UDP port 5001

Binding to local address 224.1.1.1

Joining multicast group  224.1.1.1

Receiving 1470 byte datagrams

UDP buffer size:  224 KByte (default)

------------------------------------------------------------

[  3] local 224.1.1.1 port 5001 connected with 10.224.148.94 port 41301

[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams

[  3]  0.0- 1.0 sec   128 KBytes  1.05 Mbits/sec   0.029 ms    0/   89 (0%)

[  3]  1.0- 2.0 sec   128 KBytes  1.05 Mbits/sec   0.031 ms    0/   89 (0%)

[  3]  2.0- 3.0 sec   128 KBytes  1.05 Mbits/sec   0.025 ms    0/   89 (0%)

[  3]  0.0- 3.0 sec   386 KBytes  1.05 Mbits/sec   0.025 ms    0/  269 (0%)

[root@VM2 ~]# netstat -g -n

IPv6/IPv4 Group Memberships

Interface       RefCnt Group

--------------- ------ ---------------------

lo              1      224.0.0.1

eth0            1      224.1.1.1

eth0            1      224.0.0.1

Conclusion:

1. Openvswitch do not support IGMP snooping, and if the VM on one compute node send multicast packets, all the VM on the same compute and in the same Vlan will receive the multicast packets. This may have some performance loss
here. As I know, Cisco N1K can support IGMP snooping. If we use N1K can get better performance here.

2. If VMs use External Router, we need config the External Router to support IGMP, and in this situation the Multicast can work well in Openstack. If you use neutron-l3-agent, it will use iptables + namespace to simulate Virtual Router, it does
not support Multicast now.

Multicast on Openstack的更多相关文章

  1. 完整部署CentOS7.2+OpenStack+kvm 云平台环境（5）--问题解决

    一.[root@openstack-server ~]# nova listERROR (CommandError): You must provide a username or user id v ...

  2. 理解 OpenStack 高可用（HA）（3）：Neutron 分布式虚拟路由（Neutron Distributed Virtual Routing）

    本系列会分析OpenStack 的高可用性(HA)概念和解决方案: (1)OpenStack 高可用方案概述 (2)Neutron L3 Agent HA - VRRP (虚拟路由冗余协议) (3)N ...

  3. 理解 OpenStack 高可用（HA）（2）：Neutron L3 Agent HA 之 虚拟路由冗余协议（VRRP）

    本系列会分析OpenStack 的高可用性(HA)概念和解决方案: (1)OpenStack 高可用方案概述 (2)Neutron L3 Agent HA - VRRP (虚拟路由冗余协议) (3)N ...

  4. openstack网络（neutron）模式之GRE的基本原理

    neutron网络目的是为OpenStack云更灵活的划分网络,在多租户的环境下提供给每个租户独立的网络环境. neutron混合实施了第二层的VLAN和第三层的路由服务,它可为支持的网络提供防火墙, ...

  5. centos7.1 x86_64系统安装openstack（Mitaka）一

    一.Openstack各组件简单介绍 keystone:身份认证服务 glance:镜像服务 nova:计算服务 neutron:网络服务 Cinder:块存储服务 Swift:对象存储服务 heat ...

  6. 深入理解openstack网络架构(1)

    原文地址: https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture 译文转载自:http://b ...

  7. 理解 OpenStack Swift （1）：OpenStack + 三节点Swift 集群+ HAProxy + UCARP 安装和配置

    本系列文章着重学习和研究OpenStack Swift,包括环境搭建.原理.架构.监控和性能等. (1)OpenStack + 三节点Swift 集群+ HAProxy + UCARP 安装和配置 ( ...

  8. Openstack Basic Networking 翻译

    自己翻译,加强理解.并学习英文和写作. 英文地址:http://docs.openstack.org/networking-guide/intro_basic_networking.html 目录: ...

  9. OpenStack网络指导手册 －基本网络概念

    转自:http://blog.csdn.net/zztflyer/article/details/50441200 目录(?)[-] 以太网Ethernet 虚拟局域网VLANs 子网和地址解析协议S ...

随机推荐

  1. Codeforces 196 C. Paint Tree

    分治.选最左上的点分给根.剩下的极角排序后递归 C. Paint Tree time limit per test 2 seconds memory limit per test 256 megaby ...

  2. 杭州电ACM1098——Ignatius's puzzle

    这个话题.简单的数学. 对于函数,f(x)=5*x^13+13*x^5+k*a*x,输入k,对于休闲x,一个数字的存在a,使f(x)是65可分. 对于休闲x. 因此,当x = 1时间,f(x) = 1 ...

  3. Replace - with an en dash character (–, –) ?

    这个安卓开发过程中eclipse的提示,新浪网友给出这个解决方法:http://blog.sina.com.cn/s/blog_5ea8670101015dgk.html  太笨了. 看看stacko ...

  4. Music Studio项目心得--JNI实现C++调用JAVA

    这个项目是我參加内蒙古挑战杯的比赛项目,因为时间关系,我没时间实现OpenOMR开源项目由JAVA全然向C++的转换,经过我半个多月的尝试,我将OpenOMR中的1/3的代码改写成C++,只是非常快我 ...

  5. 纯CSS实现各类气球泡泡对话框效果

    原文 纯CSS实现各类气球泡泡对话框效果 一.关于纯CSS实现气泡对话框 首先,来张大图: 上边这张黄黄的,大大的,圆圆的,有个小尾巴,文字内容有些YY的图片,就是使用纯CSS实现的气泡对话框效果,一 ...

  6. 在ASP.NET MVC 中获取当前URL、controller、action(转)

    URL的获取很简单,ASP.NET通用: [1]获取 完整url (协议名+域名+虚拟目录名+文件名+参数) string url=Request.Url.ToString(); [2]获取 虚拟目录 ...

  7. （转）一篇很不错的介绍Eclipse插件Menu及其扩展点的文章

    原文在:http://tech.ddvip.com/2010-04/1271054623150507.html 菜单是各种软件及开发平台会提供的必备功能,Eclipse 也不例外,提供了丰富的菜单,包 ...

  8. svn rm --keep-local ./QueryParser_kill.logs

    svn rm --keep-local ./QueryParser_kill.logs

  9. C：打印菱形（自己的方法）

    //-------------------*打印菱形*--------------------- int i,j,k; int n; printf("请输入一个奇数n:"); sc ...

  10. Set vs. Set<?>（转）

    You may know that an unbounded wildcard Set<?> can hold elements of any type, and a raw type S ...