Branching UPF can't return packet to gNB in ulcl architecture.

[WAETW]

Hi, I am deploying ULCL configuration in my Kubernetes cluster with default setting. I use pod's main interface "eth0" as N6 interface, the ping packet could route through the internet to 8.8.8.8.The packet reply had been encapsulated at UPF1 and routed to Branching UPF's N9 interface, but Branching UPF can't route the GTP-U packet back to gNB through N3 interface. Is there something wrong about the routing setting? BTW the non-ulcl version work good for me. This is my pcap file pcap.zip.

Best

[raoufkh]

Hello

I've reproduced this scenario with the last version of helm charts and you're right! No internet connection for the UE. I'll work on the resolution.

Regards, Abderaouf

[prati08]

Hi Raoufkh,

Any help on above issue, i am also facing same issue

[prati08]

Hi, I am deploying ULCL configuration in my Kubernetes cluster with default setting. I use pod's main interface "eth0" as N6 interface, the ping packet could route through the internet to 8.8.8.8.The packet reply had been encapsulated at UPF1 and routed to Branching UPF's N9 interface, but Branching UPF can't route the GTP-U packet back to gNB through N3 interface. Is there something wrong about the routing setting? BTW the non-ulcl version work good for me. This is my pcap file pcap.zip.

Best

Hi WAETW,

Any help on above issue

[prati08]

Hi, I am deploying ULCL configuration in my Kubernetes cluster with default setting. I use pod's main interface "eth0" as N6 interface, the ping packet could route through the internet to 8.8.8.8.The packet reply had been encapsulated at UPF1 and routed to Branching UPF's N9 interface, but Branching UPF can't route the GTP-U packet back to gNB through N3 interface. Is there something wrong about the routing setting? BTW the non-ulcl version work good for me. This is my pcap file pcap.zip.

Best

HI WAETW can you please provide your smf , uerouting and upf config file for reference

[raoufkh]

Hello @prati08

I confirm that the branching mode does not work correctly with the latest version. I'll work on it.

Regards, Abderaouf

[prati08]

Hi Raoufkh

can you please help wrt to 3.0.5 and can you please confirm it is working fine 3.0.5 version

[raoufkh]

It was working with the initial version of free5gc. You can get it by helm repo add towards5gs 'https://raw.githubusercontent.com/Orange-OpenSource/towards5gs-helm/main/repo/', helm repo update and then helm pull towards5gs/free5gc --version 0.1.1

[prati08]

Thanks Raoufkh

[prati08]

Hi raoufkh

Sorry one last question , there is any way where we can load balanced the traffic across multiple anchor UPF via Branching UPF.

[raoufkh]

Hi @prati08

First, sorry for the delay I was missing your message

For the load balancing across multiple UPFs, I don't think that it is possible with the Branching mode. In the branching mode, routing configuration is specified manually in uerouting.yaml

[phunghaduong99]

Hi @raoufkh ,

Is there any fix until now cause I am also facingthe same issue, my Branching UPF can't return packet to gNB in ulcl mode.