Connecting multiple gNBs to Open5gs CN: srsRAN

[praghur]

Hello POWDER community. 

I am creating a scenario with multiple gNBs connecting to the Open5gs CN. The first UE-gNB pair connects to the CN without any issue. However, I am unable to connect to the second gNB. The error message I receive is: 

Connecting to AMF on 127.0.0.5:38412
Failed to connect SCTP socket to 127.0.0.5:38412. error="Connection refused" timeout=0ms
srsGNB ERROR: Failed to create SCTP gateway.

I changed the IP address of the bind_addr. Is there anything else I need to change/edit to add another gNB to the network? 

amf:
  addr: 127.0.0.5                  # The address or hostname of the AMF.
  bind_addr: 127.0.0.2             # A local IP that the gNB binds to for traffic from the AMF.

Thanks in advance. 

[Dustin Maas]

I’d have a look at the AMF log (/var/log/open5gs/amf.log) for a hint as to why this connection is being refused.

-Dustin

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[Priya Raghuraman]

Hi Dustin. 

I did take a look at the AMF log. It does not show any activity of trying to connect to the gNB2. The only activity shown in the log is successful connection of gnb1. Hence, I think that the amf never gets called in this process since the gateway itself fails to create. Is there any other log I can take a look at to understand what I am missing? Please let me know. Thanks a lot. 

06/25 13:55:01.419: [app] INFO: Configuration: '/etc/open5gs/amf.yaml' (../lib/app/ogs-init.c:133)

06/25 13:55:01.419: [app] INFO: File Logging: '/var/log/open5gs/amf.log' (../lib/app/ogs-init.c:136)

06/25 13:55:01.424: [metrics] INFO: metrics_server() [http://127.0.0.5]:9090 (../lib/metrics/prometheus/context.c:299)

06/25 13:55:01.424: [sbi] INFO: NF Service [namf-comm] (../lib/sbi/context.c:1841)

06/25 13:55:01.424: [sbi] INFO: nghttp2_server() [http://127.0.0.5]:7777 (../lib/sbi/nghttp2-server.c:414)

06/25 13:55:01.424: [amf] INFO: ngap_server() [127.0.0.5]:38412 (../src/amf/ngap-sctp.c:61)

06/25 13:55:01.424: [sctp] INFO: AMF initialize...done (../src/amf/app.c:33)

06/25 13:55:01.427: [sbi] INFO: [cee140b4-332c-41ef-97b0-db136fc3eacf] NF registered [Heartbeat:10s] (../lib/sbi/nf-sm.c:221)

06/25 13:55:01.429: [sbi] INFO: [cee22dc6-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428179-06:00 [duration:86400,validity:86399.999023,patch:43199.999511] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.429: [sbi] INFO: [cee2353c-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428374-06:00 [duration:86400,validity:86399.999054,patch:43199.999527] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.429: [sbi] INFO: [cee23f00-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428616-06:00 [duration:86400,validity:86399.999079,patch:43199.999539] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.429: [sbi] INFO: [cee24216-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428698-06:00 [duration:86400,validity:86399.998947,patch:43199.999473] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.429: [sbi] INFO: [cee24a2c-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428902-06:00 [duration:86400,validity:86399.998924,patch:43199.999462] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.430: [sbi] INFO: [cee24d2e-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.428982-06:00 [duration:86400,validity:86399.998658,patch:43199.999329] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.430: [sbi] INFO: [cee25774-332c-41ef-973b-6fc97b9b94da] Subscription created until 2024-06-26T13:55:01.429246-06:00 [duration:86400,validity:86399.998880,patch:43199.999440] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:01.603: [sbi] INFO: (NRF-notify) NF registered [cee9338c-332c-41ef-b310-75057884046d:1] (../lib/sbi/nnrf-handler.c:1058)

06/25 13:55:01.603: [sbi] INFO: [SMF] (NRF-notify) NF Profile updated [cee9338c-332c-41ef-b310-75057884046d:1] (../lib/sbi/nnrf-handler.c:1072)

06/25 13:55:11.438: [sbi] WARNING: [cee140b4-332c-41ef-97b0-db136fc3eacf] HTTP response error [404] (../lib/sbi/nf-sm.c:277)

06/25 13:55:11.438: [sbi] INFO: [cee140b4-332c-41ef-97b0-db136fc3eacf] NF de-registered (../lib/sbi/nf-sm.c:248)

06/25 13:55:13.441: [sbi] WARNING: [cee140b4-332c-41ef-97b0-db136fc3eacf] Retry registration with NRF (../lib/sbi/nf-sm.c:405)

06/25 13:55:13.443: [sbi] INFO: [cee140b4-332c-41ef-97b0-db136fc3eacf] NF registered [Heartbeat:10s] (../lib/sbi/nf-sm.c:221)

06/25 13:55:13.446: [sbi] INFO: [d60bb798-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.444464-06:00 [duration:86400,validity:86399.998036,patch:43199.999018] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.446: [sbi] INFO: [d60bc990-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.444919-06:00 [duration:86400,validity:86399.998203,patch:43199.999101] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.447: [sbi] INFO: [d60bd368-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.445170-06:00 [duration:86400,validity:86399.998129,patch:43199.999064] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.447: [sbi] INFO: [d60be5ba-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.445648-06:00 [duration:86400,validity:86399.998127,patch:43199.999063] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.447: [sbi] INFO: [d60beb8c-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.445786-06:00 [duration:86400,validity:86399.998024,patch:43199.999012] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.447: [sbi] INFO: [d60bfb2c-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.446187-06:00 [duration:86400,validity:86399.998209,patch:43199.999104] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.448: [sbi] INFO: [d60c0892-332c-41ef-ab38-ffeacfbc810a] Subscription created until 2024-06-26T13:55:13.446529-06:00 [duration:86400,validity:86399.998329,patch:43199.999164] (../lib/sbi/nnrf-handler.c:813)

06/25 13:55:13.619: [sbi] WARNING: [SMF] (NRF-notify) NF has already been added [cee9338c-332c-41ef-b310-75057884046d:1] (../lib/sbi/nnrf-handler.c:1061)

06/25 13:55:13.619: [sbi] INFO: [SMF] (NRF-notify) NF Profile updated [cee9338c-332c-41ef-b310-75057884046d:1] (../lib/sbi/nnrf-handler.c:1072)

06/25 13:55:13.619: [sbi] WARNING: NF EndPoint(addr) updated [127.0.0.4:80] (../lib/sbi/context.c:2210)

06/25 13:55:13.619: [sbi] WARNING: NF EndPoint(addr) updated [127.0.0.4:7777] (../lib/sbi/context.c:1946)

06/25 14:13:22.268: [amf] INFO: gNB-N2 accepted[127.0.0.1]:35958 in ng-path module (../src/amf/ngap-sctp.c:113)

06/25 14:13:22.268: [amf] INFO: gNB-N2 accepted[127.0.0.1] in master_sm module (../src/amf/amf-sm.c:757)

06/25 14:13:22.278: [amf] INFO: [Added] Number of gNBs is now 1 (../src/amf/context.c:1236)

06/25 14:13:22.278: [amf] INFO: gNB-N2[127.0.0.1] max_num_of_ostreams : 30 (../src/amf/amf-sm.c:796)

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