1. When AAA Server identifies the P-GW selection method as Dynamic and if the local P-GW address is configured under the APN Profile, the SaMOG Gateway will perform local P-GW selection in the following scenarios:

   • The P-GW addresses received by DNS resolution are unreachable.

   • The DNS server is unreachable, or the DNS query is rejected.

   • DNS resolution is not configured, and/or the AAA server does not send the P-GW address.

2. When AAA Server identifies the P-GW selection method as static (P-GW IP Address or P-GW FQDN):

   If the local P-GW address(es) are configured under the APN Profile and also P-GW selection fallback for P-GW ID is configured under mrme-service, the SaMOG Gateway will perform local P-GW selection in the following scenarios:

   • The P-GW address mentioned by AAA server or received by DNS resolution (P-GW FQDN) is unreachable

   • The DNS server is unreachable, or the DNS query is rejected (for P-GW FQDN).

   • DNS resolution is not configured (for P-GW FQDN).

The SaMOG Gateway can be configured to use the local P-GW addresses for P-GW node selection as the preferred selection method.

This method is applicable only when the AAA server mentions the selection method as dynamic and the "local-configuration-preferred" configuration is enabled under mrme-service.

Note	This configuration is not effective when the AAA server mentions the selection method as static.

• In this release, the SaMOG Gateway does not support dual bind (IPv4 and IPv6) address for EGTP service (or GTPU service).

• The PGW-Fallback is supported only for GTPv2 Network Protocol.

Use the pgw-address command under the APN Profile Configuration Mode to define local P-GW addresses for load balancing.

configure 
    apn-profile profile-name 
        pgw-address ipv4_address |  ipv6_address weight weight [ primary | secondary ] 
        no pgw-address ipv4_address | ipv6_address 
        end 

Notes:

• Use the no pgw-address ipv4_address | ipv6_address command to disable the P-GW address(es) configured for an APN profile.

  ipv4_address must be an IPv4 address expressed in dotted-decimal notation.

  ipv6_address must be an IPv6 address expressed in colon (or double-colon) notation.

• weight weight

  Configures the weight for the IPv4 or IPv6 address.

  weight is an integer from 1 to 100.

• primary | secondary

  primary : Configures the primary P-GW for S2b interface.

  secondary : Configures the primary P-GW for S2b interface.

• A maximum of 16 P-GW IPv4 and/or IPv6 addresses can be configured for an APN profile.

• When multiple P-GW addresses are configured, only the first P-GW will be selected based on the weight. The rest of the P-GW addresses are selected using the round-robin mechanism

Use the pgw-selection command under the MRME Service Configuration Mode to set the P-GW address selection from a local configuration as the preferred selection mechanism.

configure 
    context context_name 
        mrme-service service_name 
            pgw-selection local-configuration-preferred 
            end 

Notes:

• Use the no pgw-selection local-configuration-preferred command to disable this command.

• By default, this command is disabled. The SaMOG Gateway uses DNS-based P-GW selection (dynamic selection) as the preferred selection method.

Use the pgw-selection command under the MRME Service Configuration Mode to set the P-GW address selection from a local configuration as static selection method.

configure 
    context context_name 
        mrme-service service_name 
            pgw-selection fallback pgw-id 
            end 

Notes:

• Use the no pgw-selection fallback pgw-id command to disable this command.

• By default, this command is disabled.

show apn-profile full all

Use the show apn-profile command to verify the configured P-GW IP address(es).

P-GW: 
 IP-Address                         : 6666::200:1 
 S5-S8-Protocol                     : N/A 
 Weight                             : 1 
IP-Address                          : 6666::a00:1 
 S5-S8-Protocol                     : N/A 
 Weight                             : 17 

show mrme-service name mrme_service_name

Use the show mrme-service name command to verify the status of the local P-GW selection configuration.

Preferred PGW selection mechanism : Local 

PGW-ID selection fallback : Enabled 

show samog-service statistics

The following fields are available to the output of the show samog-service statistics command in support of this feature.

Local PGW Fallback Stats: 
 Attempted:               0 
  Success: 		             0        No Alternate GW:           0