openstack and SDN .pdf

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Bird's Eye View on
Neutron & SDN
Xin Wu @ Big Switch Networks

Logical View: Same as Wireless Router at Home
1.1.1.2

192.168.1.1/24
host1

host2

tenant
A
router

1.1.1.3

external
network

tenant
B
router

192.168.2.1/24

192.168.1.1/24

192.168.2.1/24

host3

host4

host6

host5

Physical View
spine

leaf1

leaf2

host2

vswitch1

host1

host3

host4

host6

server1

host5

Tenant Router Is Missing

Key Question: Where to Implement Tenant Router?
Option 1: one software router on a server
Option 2: distributed router on switches

Option 1: One Software Router on a Server
openstack
controller

spine

leaf1

SDN controller

host2

vswitch1

host1

host3

host4

leaf3

leaf2

host6

server1

host5

vswitch2

tenant A router

tenant B router

server2

openstack
controller

1.

cr

ea

te

VM

&

at

ta
c

h

VM

to

vs
w

itc

h

2.

cre
po ate/u
rt,
vla pdate
n,
ma serv
c, I erid
P,
ne ,
two

rk

Extremely Simplified Control Plane Flow

SDN
controller

vswitch

3. program flow entries

agents

Option 1: One Software Router on a Server
Pros: server only

Option 1: One Software Router on a Server
Cons 1: cannot support non-vm workloads
Solution: offload tunnel to physical switch
openstack
controller

spine

leaf1

SDN controller

host2

vswitch1

host1

host3

host4

leaf3

leaf2

host6

server1

host5

vswitch2

tenant A router

tenant B router

server2


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