feat(docs): Add Methodology

[csit.git] / docs / content / methodology / geneve.md

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+---
+bookToc: false
+title: "GENEVE"
+weight: 21
+---
+
+# GENEVE
+
+## 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
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