the goals proposal realizing broadcast/multicast in virtual networks
DESCRIPTION
Outline Backgrounds Related Work Proposal Evaluation 1 Network Virtualization 2 Related Work IP multicast in substrate networks Source-based Unicast Replication 3 Proposal 4 EvaluationTRANSCRIPT
Nagoya Institute of Technology, Japan.
Keisuke Matsuo Ryota Kawashima Hiroshi Matsuo Nagoya Institute of
Technology, Japan. The Goals Proposal Realizing broadcast/multicast
in virtual networks
Reducing traffic amount in substrate networks Broadcast Multicast
Virtual Network VM VM VM VM Proposal PM PM PM PM Physical Network
PM : Physical Machine Outline Backgrounds Related Work Proposal
Evaluation 1
Network Virtualization 2 Related Work IP multicast in substrate
networks Source-based Unicast Replication 3 Proposal 4 Evaluation
Multi-tenant Datacenter Networks
Overlay-based network virtualization Each tenant can have its own
virtual networks Virtual Networks Tenant A VM VM Tenant C VM VM
Tenant B VM VM VM VM VM Physical Network Broadcast on Virtual
Networks
Multiple VMs of different tenant run on same PMs Physical Switch
Virtual Switch VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM
Sender Physical Machine Generate many wasteful packets VM : Tenant
A VM : The Other Tenant Broadcast on Virtual Networks
VM VM VM VM PM PM PM PM PM PM PM PM Physical Network PM : Physical
Machine B/Mcast Support on Major Services
Amazon VPC, Microsoft Azure Broadcast/Multicast do not be supported
VMware NSX Supporting broadcast/multicast Unicast Replication
methods Major Broadcast Protocols
Physical networks use various protocols ARP RARP Gratuitous ARP
DHCP Broadcast communication on Virtual Networks is not allowed
Functionality of virtual networks is poor Major Multicast-related
Protocols
Routing protocol OSPF Construction of routing table Providing
High-Availability VRRP Heartbeat messages among servers Without IP
Multicast, we cant construct practical virtual networks Outline
Backgrounds Related Work Proposal Evaluation 1
Network Virtualization 2 Related Work IP multicast in substrate
networks Source-based Unicast Replication 3 Proposal 4 Evaluation
IP Multicast in Substrate Networks
VXLAN Mapping virtual networks to IP multicast groups Virtual
Switch VM VM VM VM VM VM VM Multicast group A Virtual Network A VM
VM VM VM VM VM VM VM VM Multicast group B Multicast group C Virtual
Network C Virtual Network B Physical Machine IP Multicast in
Substrate Networks
Virtual Network VM VM VM VM VM VM VM router router router PM PM PM
PM PM PM PM PM Physical Network Introducing and managing multicast
routers cost a lot Source-based Unicast Replication (SUR)
Duplicates the packet Replaces dest addresses Hot-spot Controller
Hot-spot VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM VM Sender
Hot-spot in both upstream and sender-side links VM : Tenant A VM :
The Other Tenant Source-based Unicast Replication
Virtual Network VM VM VM VM VM VM VM Controller Hot-spot Hot-spot
PM PM PM PM PM PM PM PM Physical Network Outline Backgrounds
Related Work Proposal Evaluation 1
Network Virtualization 2 Related Work IP multicast in substrate
networks Source-based Unicast Replication 3 Proposal 4 Evaluation
(Broadcast, Unknown unicast and Multicast)
Our Proposal TE-Cast: Topology Embedded xCast Supporting
broadcast/multicast in virtual networks Reducing traffic amount in
substrate networks Logically grouped virtual switches Encapsulated
BUM packets with topology information On-the-fly packet forwarding
on virtual switches (Broadcast, Unknown unicast and Multicast)
Proposal Overview Our proposal can reduce traffic amount
Sends network topology information to the Sender-side switch
Controller Group1 Group2 Group3 Creates packets containing the
topology information Group4 VM VM VM VM VM VM VM VM VM VM VM VM VM
VM VM VM Sender Our proposal can reduce traffic amount in both
upstream and sender-side links : Representative switch VM : Tenant
A VM : The Other Tenant Proposal Overview Virtual Network Physical
Network Controller PM PM PM
VM VM VM VM VM VM VM Controller PM PM PM PM PM PM PM PM Physical
Network Key Features of Our Proposal
Grouping Virtual Switches Getting Topology Information Forwarding
Mechanism Multicast Support Grouping Virtual Switches
Reduction of traffic amount Grouping virtual switches based on
network distance Ex. server rack unit based Representative virtual
switch Different switch can be elected for each flow Packet
processing load can be distributed Group1 Server rack 5 1 2 3 4
Representative Key Features of Our Proposal
Grouping Virtual Switches Getting Topology Information Forwarding
Mechanism Multicast Support Getting Topology Information
Using OpenFlow protocol Network topology information dl_dst =
ff:ff:ff:ff:ff:ff Actions = CONTROLLER Database OFPT_PACKET_IN
OFPT_FLOW_MOD OFPT_VENDOR Controller VM VM Tenant ID, IP address,
MAC address, switch port number Key Features of Our Proposal
Grouping Virtual Switches Getting Topology Information Forwarding
Mechanism Multicast Support Extracts the original packet
Packet Encapsulation Extracts the original packet Encapsulation
Physical Network VM VM Receiver Sender Ethernet (Physical) IP
Proposal UDP Physical Network Header Ethernet (Virtual) Payload
Original Packet Packet Delivery within a Group
Analyzing the topology information 2 PM1 PM2 Representative Non
Representative 1 3 Group1 VM1 VM2 VM3 VM4 Ethernet (Physical) IP
(Physical) UDP (Physical) Proposal Ethernet (Virtual) Payload
Addresses for PM2 Entry for VM1 Total length Tenant ID Type IPPM1
MACPM1 IPVM1 MACVM1 Output port Num IPPM2 MACPM2 IPVM3 MACVM3 Entry
for VM3 Key Features of Our Proposal
Grouping Virtual Switches Getting Topology Information Forwarding
Mechanism Multicast Support IP Multicast on Virtual Networks
Multicast routers are not required Virtual Network VM Manage
Multicast Group VM VM VM VM VM VM Controller PM PM PM PM PM PM PM
PM Physical Network How to Manage Multicast Groups
Controllers manage multicast groups Snooping IGMP packets IGMP Join
message Actions = CONTROLLER Adds this VM to the multicast group
Controller OFPT_FLOW_MOD OFPT_PACKET_IN VM VM VRRP (Multicast)
Providing High-Availability function Virtual Network
Virtual IP address Multicast address Providing High-Availability
function Virtual Network VM VM VM VM VM Multicast VM Backup Master
Controller PM PM PM PM Physical Network OSPF (Multicast) Each
router constructs routing tables Virtual Network
Multicast address OSPF Virtual Network VM VM VM OSPF Virtual Router
VM VM Controller PM PM PM PM Physical Network Floodlight
Controller
Implementation Open vSwitch Controller Virtual switches Open
vSwitch 2.3.1 ofproto Get topology information datapath Deliver
packets in groups Controllers Floodlight 0.90 Management function
of topology information Userspace ofproto Kernel Module VM datapath
Physical NIC OpenFlow Protocol Internal Services Core Services
TE-Cast Applications App. Floodlight Controller Pros and Cons Pros
Supporting Broadcast/Multicast on virtual networks ( Comparing with
VXLAN ) Multicast routers are not required On-the-fly packet
forwarding on virtual switches ( Comparing with the Source Unicast
Replication ) Mitigating hot-spot links Cons Hop counts for packet
delivery can increase The processing load of the controller
increase Outline Backgrounds Related Work Proposal Evaluation
1
Network Virtualization 2 Related Work IP multicast in substrate
networks Source-based Unicast Replication 3 Proposal 4 Evaluation
Evaluation Comparing with Source Unicast Replication
Packet transfer delay Packet amounts in links Physical topology
& machine specifications Physical Switch H 1GbE network 1GbE
network Floodlight Mininet OS CentOS 6.6 (2.6.32) CPU Intel Core i
GHz Memory 16GB OS CentOS 7.0 (3.10.0) CPU Intel Core i GHz Memory
16GB Network Environment Communications on tenant A Group1 Group2
Group3
Bridge Floodlight Bridge Bridge Bridge Group1 Group2 Group3 H1 H2
H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15 H16 VM : Tenant A VM :
The Other Tenant Result of Packet Transfer Delay
Floodlight Bridge Bridge Bridge Bridge Representative Non
Representative H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15
H16 Responder Responder Sender ARP response time Pattern 1: Default
Responder: Host 1 Pattern 2: Source Unicast Replication, Proposal
(Representative) Via controller Pattern 3: Proposal (Non
Representative) Responder: Host 5 Via controller + Representative
switch [packets] Delay [ms] Result of Packet Amounts in Links
Floodlight Bridge 1 12 19 Bridge Bridge Bridge 2 3 13 14 20 21 4 5
6 7 8 9 10 11 15 16 17 18 22 23 24 25 H1 H2 H3 H4 H5 H6 H7 H8 H9
H10 H11 H12 H13 H14 H15 H16 The number of BUM packets in each link
Every host of tenant A transmits broadcast Pattern 1: Default
Pattern 2: Source Unicast Replication Pattern 3: Proposal Relative
packet amounts 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ~ 25
Our proposal reduced traffic amount in upstream and sender-side
links Ratio of reduced packets SUR 20% Proposal 44% There were no
wasteful packets Conclusion Broadcast/Multicast in virtual
networks
Waste of the Network Bandwidth Proposal: TE-Cast (Topology Embedded
xCast) Supporting Broadcast/Multicast on virtual Networks Reducing
packet amounts Realizing on-the-fly virtual switches Future work A
cache mechanism of topology information Reducing the network delay
Distribution of processing load of the controller Using distributed
controllers Result of Packet Amounts in Links
SUR Proposal Bridge 1 12 19 Bridge Bridge Bridge 2 3 13 14 20 21 4
5 6 7 8 9 10 11 15 16 17 18 22 23 24 25 H1 H2 H3 H4 H5 H6 H7 H8 H9
H10 H11 H12 H13 H14 H15 H16 Relative packet amounts 1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 ~ 25 Result of Packet Amounts in
Links
SUR Proposal Bridge 1 12 19 Bridge Bridge Bridge 2 3 13 14 20 21 4
5 6 7 8 9 10 11 15 16 17 18 22 23 24 25 H1 H2 H3 H4 H5 H6 H7 H8 H9
H10 H11 H12 H13 H14 H15 H16 Relative packet amounts 1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 ~ 25 Create Multicast Group
Supporting Multicast Controllers construct multicast groups
Snooping IGMP packets Controller Create Multicast Group IGMP Join
message OFPT_PACKET_IN VM VM 1 Match ! Entry 1 Entry 1 copy Entry 2
Entry n Entry list for Tenant A Multicast group 1