.. _geneve_methodology:
Generic Network Virtualization Encapsulation
--------------------------------------------
GENEVE Prefix Bindings
^^^^^^^^^^^^^^^^^^^^^^
GENEVE prefix bindings should be representative to target applications, where
a packet flows of particular set of IPv4 addresses (L3 underlay network) is
routed via dedicated GENEVE interface by building an L2 overlay.
Private address ranges to be used in tests:
- East hosts ip address range: 10.0.1.0 - 10.127.255.255 (10.0/9 prefix)
- Total of 2^23 - 256 (8 388 352) of usable IPv4 addresses
- Usable in tests for up to 32 767 GENEVE tunnels (IPv4 underlay networks)
- West hosts ip address range: 10.128.1.0 - 10.255.255.255 (10.128/9 prefix)
- Total of 2^23 - 256 (8 388 352) of usable IPv4 addresses
- Usable in tests for up to 32 767 GENEVE tunnels (IPv4 underlay networks)
GENEVE Tunnel Scale
~~~~~~~~~~~~~~~~~~~
If N is a number of GENEVE tunnels (and IPv4 underlay networks) then TG sends
256 packet flows in every of N different sets:
- i = 1,2,3, ... N - GENEVE tunnel index
- East-West direction: GENEVE encapsulated packets
- Outer IP header:
- src ip: 1.1.1.1
- dst ip: 1.1.1.2
- GENEVE header:
- vni: i
- Inner IP header:
- src_ip_range(i) = 10.(0 + rounddown(i/255)).(modulo(i/255)).(0-to-255)
- dst_ip_range(i) = 10.(128 + rounddown(i/255)).(modulo(i/255)).(0-to-255)
- West-East direction: non-encapsulated packets
- IP header:
- src_ip_range(i) = 10.(128 + rounddown(i/255)).(modulo(i/255)).(0-to-255)
- dst_ip_range(i) = 10.(0 + rounddown(i/255)).(modulo(i/255)).(0-to-255)
+----------------+-------------+
| geneve-tunnels | total-flows |
+================+=============+
| 1 | 256 |
+----------------+-------------+
| 4 | 1 024 |
+----------------+-------------+
| 16 | 4 096 |
+----------------+-------------+
| 64 | 16 384 |
+----------------+-------------+
| 256 | 65 536 |
+----------------+-------------+
| 1 024 | 262 144 |
+----------------+-------------+