Static cellular system IPv4 mode

When a PDN router interface is configured for static cellular system IPv4 mode, consider the following points when setting up a service over a PDN router interface and its associated cellular port:

• The system IP address used to manage the node is the same as the cellular PDN interface IP address that gets assigned during the cellular attachment procedure.

• SDPs that are destined for the local node from other nodes must be configured to use the system IP address (identical to the cellular IP address) of the local node as the far-end address.

• T-LDP signaling sessions from the local node to peers use the system IP address as the local address for these sessions. This is the default behavior of the SR OS. The T-LDP sessions from peer nodes to the local node must be established to the system IP address.

• BGP sessions from the local node to peers where BGP VPWS, BGP VPLS, MP-BGP, or BGP routing is required for services use the system IP address as the local address for sessions. This is the default behavior of the SR OS. BGP sessions from peer nodes to the local node must be established to the system IP address.

• Static cellular system IPv4 mode supports all service types.

• In a dual SIM deployment, static cellular system IPv4 mode requires that the same IP address be allocated for both SIMs. The single system IP address allocation depends on this requirement being met. This requirement can be challenging to meet in most deployment models. Static cellular interface IP mode or dynamic cellular interface IP mode should be considered when dual SIM is required, as these modes allow different IP addresses to be allocated for each SIM.