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manual: add charts explaining tunend and tunmap

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Change-Id: Ia0674c97eb0d8b5caeae988aefe523c5eee7318b
This commit is contained in:
Neels Janosch Hofmeyr
2022-12-12 00:31:54 +01:00
parent 52f9da22ff
commit cd345bd6cd
1 changed files with 26 additions and 0 deletions
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26
doc/manuals/chapters/overview.adoc
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@@ -79,6 +79,19 @@ and encapsulation/decapsulation of GTP tunnels.
OsmoUPF does not support the complete PFCP feature set. It detects exactly two
use cases that will provide service of actual GTP tunnels:
.tunend use case
----
Access osmo-upf Core
PGW | PDN/internet
| PDR1: > FAR1: |
| IP/GTP | IP |
| ------> F-TEID | -----> |
| | |
| FAR2: < PDR2: |
| IP/GTP | IP |
| F-TEID <------ | UE IP addr <----- |
----
* `tunend`: GTP tunnel encapsulation/decapsulation:
- One Packet Detection Rule (PDR) accepts a GTP tunnel from the Access side
with an Outer Header Removal.
@@ -86,6 +99,19 @@ use cases that will provide service of actual GTP tunnels:
- Another PDR accepts plain IP on a specific IP address from Core.
- The second PDR uses a FAR towards Access with Outer Header Creation for GTP.
.tunmap use case
----
Access osmo-upf Core
PGW | PGW
| PDR1: > FAR1: |
| IP/GTP | IP/GTP |
| ------> F-TEID | -----> F-TEID |
| | |
| FAR2: < PDR2: |
| IP/GTP | IP/GTP |
| F-TEID <------ | F-TEID <----- |
----
* `tunmap`: GTP tunnel forwarding:
- One Packet Detection Rule (PDR) accepts a GTP tunnel from the Access side
with an Outer Header Removal.