分布式路由场景

相关配置修改：

• 1，neutron.conf文件
  router_distributed = True
• 2，l3_agent.ini文件
  网络节点
  agent_mode = dvr_snat
  计算节点
  agent_mode = dvr
• 3，m2_conf.ini
  [ml2]
  enable_distributed_routing = True
  [ovs]
  bridge_mappings = physnet1:br-ex

创建虚拟机，配置浮动ip网络后会发现如下改变：

1，计算节点多了两个namespace

fip-da5b385a-0a5f-4b11-8c7b-20792d1aa7c0
用于本节点中的配置了浮动ip的vm访问外网，具体可以看该namespace中的iptables的nat规则。

[root@compute01 neutron-l3-agent]# ip netns exec fip-da5b385a-0a5f-4b11-8c7b-20792d1aa7c0 ifconfig
fg-3ee6f569-0f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 202.95.237.56  netmask 255.255.255.0  broadcast 202.95.237.255
        inet6 fe80::f816:3eff:fe33:7d71  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:33:7d:71  txqueuelen 1000  (Ethernet)
        RX packets 696666  bytes 52502651 (50.0 MiB)
        RX errors 0  dropped 2  overruns 0  frame 0
        TX packets 6561  bytes 825105 (805.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fpr-23a420aa-7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.93.95  netmask 255.255.255.254  broadcast 0.0.0.0
        inet6 fe80::f43d:13ff:fe64:887  prefixlen 64  scopeid 0x20<link>
        ether f6:3d:13:64:08:87  txqueuelen 1000  (Ethernet)
        RX packets 223  bytes 23594 (23.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 277  bytes 25816 (25.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qrouter-23a420aa-705a-46e1-b9e3-60c7a4456cbe
配置了内网的端口，用于同个租户的所有计算机节点上的虚拟机内网之间的相互通信。所有节点上qrouter名称都一致，包括网络节点。
这里还有一个作用是获取metadata信息（namespace中的iptables可以看到），发送给neutron-meta-agent服务。

[root@compute01 neutron-l3-agent]# ip netns exec qrouter-23a420aa-705a-46e1-b9e3-60c7a4456cbe ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qr-143275dd-f7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 10.0.0.1  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::f816:3eff:fe22:97e6  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:22:97:e6  txqueuelen 1000  (Ethernet)
        RX packets 6267  bytes 727072 (710.0 KiB)
        RX errors 0  dropped 1  overruns 0  frame 0
        TX packets 6742  bytes 741667 (724.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

rfp-23a420aa-7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.93.94  netmask 255.255.255.254  broadcast 0.0.0.0
        inet6 fe80::1cfa:7fff:feec:e38e  prefixlen 64  scopeid 0x20<link>
        ether 1e:fa:7f:ec:e3:8e  txqueuelen 1000  (Ethernet)
        RX packets 275  bytes 25720 (25.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 222  bytes 23552 (23.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

以上两个namespace中的fpr-23a420aa-7口用来绑定两个namespace之间的数据转发。

2,网络节点上路由的namespace

snat-23a420aa-705a-46e1-b9e3-60c7a4456cbe
用于之配置了内网ip,没有配置浮动ip的虚拟机的外网访问。

[root@network01 neutron-l3-agent]# ip netns exec snat-23a420aa-705a-46e1-b9e3-60c7a4456cbe ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qg-c85b7e80-77: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 202.95.237.54  netmask 255.255.255.0  broadcast 202.95.237.255
        inet6 fe80::f816:3eff:fe59:a287  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:59:a2:87  txqueuelen 1000  (Ethernet)
        RX packets 698740  bytes 52493856 (50.0 MiB)
        RX errors 0  dropped 37  overruns 0  frame 0
        TX packets 2010  bytes 136731 (133.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

sg-6e44f654-c6: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 10.0.0.4  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::f816:3eff:feb5:dfbc  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:b5:df:bc  txqueuelen 1000  (Ethernet)
        RX packets 51  bytes 3898 (3.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 49  bytes 4756 (4.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

qrouter-23a420aa-705a-46e1-b9e3-60c7a4456cbe
如果网络节点上启动了虚拟机，可以用来做租户虚拟机之间的通信。这里还有一个作用是获取metadata信息（namespace中的iptables可以看到），发送给neutron-meta-agent服务。
[root@network01 neutron-l3-agent]# ip netns exec qrouter-23a420aa-705a-46e1-b9e3-60c7a4456cbe ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

qr-143275dd-f7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1450
inet 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 fe80::f816:3eff:fe22:97e6 prefixlen 64 scopeid 0x20<link>
ether fa:16:3e:22:97:e6 txqueuelen 1000 (Ethernet)
RX packets 23 bytes 2110 (2.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 774 (774.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0