Slide 9
Slide 9 text
draft-ietf-dmm-srv6-mobile-uplane-03
SRv6 Mobile User Plane ~ Initial POC and Implementation | ENOG55 in Nigata Tsubame Sanjyo | 2019/02/22
5.3. Enhanced mode with unchanged gNB GTP behavior
This section describes two mechanisms for interworking with legacy
gNBs that still use GTP: one for IPv4, the other for IPv6.
In the interworking scenarios as illustrated in Figure 4, gNB does
not support SRv6. gNB supports GTP encapsulation over IPv4 or IPv6.
To achieve interworking, a SR Gateway (SRGW-UPF1) entity is added.
The SRGW maps the GTP traffic into SRv6.
The SRGW is not an anchor point, and maintains very little state.
For this reason, both IPv4 and IPv6 methods scale to millions of UEs.