Generic Network Virtualization Encapsulation
draft-gross-geneve-00
Pankaj Garg
Jesse Gross
pankajg@microsoft.com
jgross@vmware.com
Agenda




Present
Goal
Proposal
Call to Action
2
Present
3
Network Virtualization is the key to Multi-Tenant
Datacenters and Software Defined Networking
It is driving renewed interest in tunneling, tagging and
encapsulation schemes
4
Hardware endpoints, software endpoints and
controllers can evolve at different rates, but
existing formats don’t provide that flexibility
5
Existing Formats (VXLAN, NVGRE, STT)
 Lack extensibility to allow data plane
innovation
 No support for carrying meta data
 Tie in control plane that limits control plane
innovation
 Flood and learn, or other control plane semantics
6
Goal
7
Extensible Encapsulation Format
 Allows data plane (hardware, software) and
control plane to evolve and innovate at
different rates
 Allows those innovations to be standardized
later
8
Extensibility
 Many extensions have already been proposed
for VXLAN and NVGRE: protocol type, OAM,
security, etc.
 Evidence of need for extensibility rather than a
counterargument
 VXLAN and NVGRE are fundamentally not
extensible: pushing beyond the limited
header space requires all supporting devices
to update
 Ecosystem need to avoid fragmentation
9
Proposal
10
Outer UDP Header
0
1
2
3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Source Port = xxxx
|
Dest Port = Fixed Port
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
UDP Length
|
UDP Checksum
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
11
Geneve Header
0
1
2
3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Ver|
Opt Len |O|C|
Rsvd.
|
Next Protocol
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Virtual Network Identifier (VNI)
|
Reserved
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Variable Length Options
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
12
Geneve Options
0
1
2
3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Option Class
|
Type
|R|R|R| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Variable Option Data
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
13
Call to Action
Consider Geneve as a candidate solution to
address extensibility and decoupling of
control/data plane requirements as input to the
gap analysis draft.
14