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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
openstack_and_SDN.pdf (PDF, 353.15 KB)
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