Dynamic Configuration Change Support for SCTP and SBI Endpoints

Feature Summary and Revision History

Summary Data

Table 1. Summary Data

Applicable Product(s) or Functional Area

AMF

Applicable Platform(s)

SMI

Feature Default Setting

Enabled - Always-on

Related Documentation

Not Applicable

Revision History

Table 2. Revision History

Revision Details

Release

First introduced.

2021.04.0

Feature Description

AMF allows you to configure the SCTP and SBI endpoints dynamically.

This feature supports the following dynamic configurations:

  • VIP-IP, Port addition and removal in SCTP endpoint

  • TAI addition and removal in SBI

  • Slice addition and removal in SBI

Feature Configuration

Configuring this feature involves the following steps:

Configuring the SCTP Endpoint

To configure the SCTP endpoint, use the following configuration:

config 
    instance instance-id instance_id 
        endpoint sctp 
            vip-ip existing_ipv4_address offline 
                vip-ip new_ipv4_address vip-port port_number 
            vip-ipv6 existing_ipv6_address offline 
                vip-ipv6 new_ipv6_address vip-ipv6-port port_number 
                end

NOTES:

  • endpoint sctp —Specify the endpoint name as sctp.

  • vip-ip existing_ipv4_address offline —Specify IPv4 address and mark it as offline.

  • vip-ip new_ipv4_address vip-port port_number —Specify the new IPv4 address and port number.

  • vip-ipv6 existing_ipv6_address offline —Specify the IPv6 parameters of the pod on which VIP is enabled.

  • vip-ipv6 new_ipv6_address vip-ipv6-port port_number —Specify new IPv6 address and port number.

Use the following procedure to update the SCTP VIP-IP and port:

  1. Add the new VIP-IP port.

  2. Modify the gNB configuration to refer to the new VIP-IP and port.

  3. When all gNBs refer to new VIP-IP, remove the old VIP-IP and port.


Note

  • Post VIP-IP changes, AMF supports only resuming of IDLE mode subscribers with EEA0/EIA0 as the security algorithm.

  • The change in the SCTP IP address isn’t supported dynamically but the port change is supported.

  • For any addition, deletion, or update of a new IP to the existing SCTP service requires the AMF restart.

Configuration Example

The following is an example configuration for IPv4.

config
   instance instance-id 1
      endpoint sctp
         vip-ip 209.165.200.226 offline
         vip-ip 209.165.200.228 vip-port 1000
         end

The following is an example configuration for IPv6.

config
   instance instance-id 1
      endpoint sctp
         vip-ip 209.165.202.158 vip-port 1001
         vip-ipv6 2001:420:54ff:a4::139:251 vip-ipv6-port 1000
         end

Configuring the SCTP VIP-IP Port Removal

When the gNB refers to the new VIP-IP port, remove the older ports.

To configure the SCTP VIP-IP port removal, use the following configuration.

config 
    instance instance-id instance_id 
        endpoint sctp 
            no vip-ip existing_ip  
            end

NOTES:

  • instance instance-id instance_id —Specify the instance ID.

  • endpoint sctp —Specify the endpoint as sctp.

  • no vip-ip existing_ip —Specify the old IPv4 address and port number that must be removed.

Configuring the SBI Endpoint

Configuring the SBI endpoint involves the following steps:

  • Endpoint Configuration—This configuration provides the commands to configure the endpoint. For more information, refer to Configuring the Endpoint.

  • AMF Registration with NRF—This configuration provides the commands to configure AMF Registration, Deregistration with NRF. For more information, refer to Configuring AMF Registration with NRF.

  • NRF Profile Update—This configuration provides the commands to configure the trigger to NRF Profile Update. For more information, refer to Configuring the Trigger to NRF Profile Update.

Configuring the Endpoint

SBI endpoint changes don’t result in the pod restart.

After an existing IP is marked as offline and the new IP is added, the existing sessions continue, and callback URI is considered based on the previously configured IP. After this IP change, the newly registered subscribers have the callback URI based on the new IP.

To configure the SBI endpoint, use the following configuration:

config 
    instance instance-id instance_id 
        endpoint sbi 
            vip-ip existing_ip offline  
            vip-ip new_ip vip-port port_number  
            end

NOTES:

  • endpoint sbi —Specify the endpoint name as sbi.

  • vip-ip existing_ip offline —Specify the IPv4 address and mark it as offline.

  • vip-ip new_ip vip-port port_number —Specify the new IPv4 address.


Note

This feature doesn’t support multiple SBI endpoint IP configurations during the start of the system.
Configuration Example

The following is an example configuration.

config
   endpoint sbi
      vip-ip 209.165.200.226 offline
      vip-ip 209.165.200.225
      end

Configuring AMF Registration with NRF

If AMF has no active registration towards NRF, and when AMF adds or removes an SBI endpoint from offline mode, AMF sends a Registration Request towards NRF by sending its NF profile in the Registration Request.

To trigger the AMF registration with NRF when the VIP-IP is offline, use the following configuration:

config 
    instances instance-id instance_id 
        endpoint sbi 
            no vip-ip vip_ip_address offline 
            end

NOTES:

  • instances instance-id instance_id —Specify the instance ID.

  • endpoint sbi —Specify the endpoint name as SBI.

  • no vip-ip vip_ip_address offline —Specify the VIP-IP adress for SBI to remove this endpoint from offline mode.

Configuring the Trigger to NRF Profile Update

When a TAI or slice is added or removed, the AMF notifies the NRF by sending an NF Update request. The request contains the profile with the new TAI or slice information.

Configuring the NRF profile update involves the following steps:

Configuring the TAI Addition and Removal

To configure the TAI addition or removal, use the following configuration:

config 
   tai-group name tai_group_name 
      tais name tai_list_name 
         mcc mcc   
         mnc mnc 
            tac list updated_tac_list 
            end

NOTES:

  • tai-group name tai_group_name —Specify the TAI group name to which the list of TAIs must be added.

  • tais name tai_list_name —Specify the list of TAIs.

  • mcc mcc —Specify the three-digit Mobile Country Code. Must be an integer with three digits.

  • mnc mnc —Specify the two or three-digit Mobile Country Network. Must be an integer with three digits.

  • tac list updated_tac_list —Specify the modified Tracking area code (TAC) list.

Configuring the Slice Addition

To configure an addition of a Slice, use the following configuration:

config 
   amf-services service_name 
      slices name slice_name 
         sst sst   
         sdt sdt 
         end

NOTES:

  • amf-services service_name —Specify the AMF service.

  • slices name slice_name —Specify the slice name that must be added to the service.

  • sst sst —Specify the slice or service type to signify the expected network slice behaviour in terms of features and services. Must be an integer in the range of 0–255.

  • sdt sdt —Specify the slice differentiator value. It complements one or more slice or service types to allow differentiation among multiple network slices of the same slice or service type. Must be a hexadecimal.

Configuring the Slice Removal

To configure removal of a Slice, use the following configuration:

config 
   no amf-services service_name 
      slices name slice_name 
      end

NOTES:

  • amf-services service_name —Specify the AMF service name.

  • slices name slice_name —Specify the slice name that must be removed from the service.

Configuring the Internal VIP-IP for the UDP Proxy

When the internal VIP-IP is configured for the UDP-proxy (protocol) pod, the internal communication between the GTPC-EP and UDP-proxy happens over this IP address. The internal VIP-IP provides a secure channel for communication.


Note

The VIP-IP doesn't support dynamic change. To update a VIP-IP, reconfigure the VIP-IP.

To configure the Internal VIP-IP for the UDP proxy, use the following configuration:

config 
    instance instance-id instance_id 
        endpoint protocol 
            internal-vip vip_address 
            end

NOTES:

  • endpoint protocol —Specify the endpoint name as protocol.

  • instance instance-id instance_id —Specify the instance ID.

  • internal-vip vip_address —Specify the virtual IP address.