Tunnel without tunnel
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Talks about project networking for openstack with MPLS
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Tunnel without tunnel
- 1. kakao
- 3. kakao
- 4. kakao Andrew’s ‘Without’ Series Tunneling, without Tunnel 2018 What? Load Balancing, without Load Balancer 2017 What is Load Balancer? SDN, without SDN 2015 What is SDN?
- 5. kakao kakao eth0 Compute node nova-compute neutron- linuxbridge- agent neutron-dhcp- agent Gateway 10.10.100.1 linux bridge vm IP:10.10.100.2/32 Routing Table 1 10.10.100.2/32 via 192.1.1.201 BGP 192.1.1.202 BGP Virtual Switch block Process block vlan.bgp vlan.0 Virtual Router Service Route Table 1 192.1.1.201
- 6. kakao eth1 Compute node1 linux bridge vm IP:10.10.100.2/32 192.1.1.201 Routing Table Default GW 192.168.1.1 eth1 Host Route dest 10.10.100.2/32 to 10.10.100.1 connected dest 192.168.100.2 Routing Table 1 10.10.100.2/32 via 192.1.1.201 2 10.10.100.3/32 via 192.168.1.202 3 192.168.100.2/32 via 192.168.1.201, 192.1 68.1.202 192.1.1.202 Switch Namespace global name space IPTable DNAT Dest 192.168.100.2 is for warded to 10.10.100.2 Compute Node Router Veth pair Gateway 10.10.100.1 neutron- linuxbridge-agent neutron-dhcp-agent neutron-l3-agent Host Rout e dest 10.10.100.2/32 to 10.10.100.1 New IP 192.168.100.2 connected dest 192.168.100.2 Neutron Floating IP eth1 Compute node1 linux bridge vm IP:10.10.100.3/32 Routing Table Default GW 192.168.1.1 eth1 Host Route dest 10.10.100.3/32 to 10.10.100.1 connected dest 192.168.100.2 Switch Namespace global name space IPTable DNAT Dest 192.168.100.2 is for warded to 10.10.100.2 Compute Node Router Veth pair Gateway 10.10.100.1 neutron- linuxbridge-agent neutron-dhcp-agent neutron-l3-agent Host Rout e dest 10.10.100.3/32 to 10.10.100.1 New IP 192.168.100.2 connected dest 192.168.100.2 Neutron Floating IP 192.1.1.202
- 7. kakao • • • process • dhcp agent, ml2 agent, l3 agent, metadata agent and nova compute • state • linux bridge connection stage • routing table list • iptable • bgp state kakao eth0 Compute node nova-compute neutron- linuxbridge- agent neutron-dhcp- agent Gateway 10.10.100.1 linux bridge vm IP:10.10.100.2/32 Routing Table 1 10.10.100.2/32 via 192.1.1.201 BGP 192.1.1.202 BGP Virtual Switch block Process block vlan.bgp vlan.0 Virtual Router Service Route Table 1 192.1.1.201
- 8. kakao • • • Consul is hashcorp’s product • Designed for Datacenter level coordination and service discovery consul agent consul server hostname •nova process •neutron process •routing state •etc... process check state check fail? yes Alrams -kakaotalk -URL
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- 10. kakao broadcast domain2 • Application TCP IPv4 ethernet driver broadcast domain ARP Table SRC IP mac eth0 Router IP mac eth0 Application TCP IPv4 ethernet driver ARP Table dest IP mac eth0 Router IP mac eth0 broadcast termination A.K.A Router client destination
- 11. kakao Application or VM TCP IPv4 ethernet driver broadcast domain ARP Table SRC IP mac eth0 Router IP mac eth0 Application or VM TCP IPv4 ethernet driver ARP Table dest IP mac eth0 Router IP mac eth0 tun nel broadcast domaintun nel
- 12. kakao It solves a problem • Tenant network link layer(East-West) separation issue. It creates problems • Tennant Network Performance • Latency due to the geographical separation • full mesh between the nodes • Retransmission due to fat(+50bytes) L2 frames • Jumbo frame is not the right solutions if you try to cover datacenter, actually you can’t • Vxlan offloading is also do-able, but needs money • NAT bottleneck • e.g. openstack neutron network node bottle neck issue • DVR can distribute the NAT network but it needs router
- 13. kakao It solves a problem • Tenant network link layer(East-West) separation issue. It creates problems • Tennant Network Performance • Latency due to the geographical separation • Retransmission due to fat(+50bytes) L2 frames • Jumbo frame is not the right solutions if you try to cover datacenter, actually you can’t • Vxlan offloading is also do-able, but needs money • NAT bottleneck (North-South) • e.g. openstack neutron network node bottle neck issue • DVR can distribute the NAT network but it needs routers
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- 18. kakao • • IP routing lookup • Attaches labels • Forwards based on label • • Use label to route ( This determined by RR) • • Removes label • Packet is delivered using normal routing Pic. by Qumulus
- 19. kakao • • • à kakao eth0 Compute node nova-compute neutron- linuxbridge- agent neutron-dhcp- agent Gateway 10.10.100.1 linux bridge vm IP:10.10.100.2/32 Routing Table 1 nexthop as to 200 via inet 192.1.1.201 BGP 192.1.1.202 BGP Virtual Switch block Process block vlan.bgp vlan.0 Virtual Router Label Route Table 1 10.10.100.2/32 encap mpls 200 via 192.1.201 192.1.1.201 Routing Table 1 10.10.100.2/32 via 192.1.1.201 Add mpls info
- 20. kakao • • The important thing is that Doesn’t touch Packet in L2 • no fat packet • it add label at L3 • • Just thinks about that I didn’t use overlay network IP, only I add label. So, don’’t need NAT at all • Use the legacy IP , So the existing routing and network modeling is just working fine.
- 21. kakao • ßà 0 5 10 15 20 25 router to vm Network Performance L3 routing L3 routing with MPLS Tunnel
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