Cisco Cisco Packet Data Interworking Function (PDIF)
SaMOG Gateway Overview
▀ How the SaMOG Gateway Works
▄ SaMOG Administration Guide, StarOS Release 19
40
Step
Description
6.
SaMOG processes the received PMIPv6 PBU and responds with a PMIPv6 PBA, by including the valid Home Network
Prefix and Link Local Address provided by the P-GW during S2a procedures. SaMOG also includes the IPv6 DNS
Primary/Secondary addresses in the PMIPv6 PBA message.
Prefix and Link Local Address provided by the P-GW during S2a procedures. SaMOG also includes the IPv6 DNS
Primary/Secondary addresses in the PMIPv6 PBA message.
7.
The WLC responds with a DHCPv6 Advertise message over the CAP-WAP tunnel by including the IA_PD (IA_PD prefix)
Options, FQDN, Client Identifier, Server Identifier, Domain Search List, DNS Recursive Name Server options.
Options, FQDN, Client Identifier, Server Identifier, Domain Search List, DNS Recursive Name Server options.
8.
The UE sends the DHCPv6 Request message over the CAP-WAP tunnel by including the Client Identifier (DUID), Server
Identifier (DUID), Option Req:(DNSRNS Req, DNSSL Req), Elapsed Time, FQDN, IA_PD (IA_PD Prefix) Options.
Identifier (DUID), Option Req:(DNSRNS Req, DNSSL Req), Elapsed Time, FQDN, IA_PD (IA_PD Prefix) Options.
9.
The WLC responds with a DHCPv6 Reply message over the CAP-WAP Tunnel by including the Client Identifier (DUID),
Server Identifier (DUID), Elapsed Time, FQDN, IA_PD (IA_PD Prefix) Options.
Server Identifier (DUID), Elapsed Time, FQDN, IA_PD (IA_PD Prefix) Options.
10.
SaMOG acts as an Accounting proxy between WLC and Radius Accounting Server where all Accounting messages will
have “Framed-IPv6-Address” AVP.
have “Framed-IPv6-Address” AVP.
Important:
For PMIPv6 access type, the SLAAC and stateful DHCPv6 process remains the same as the
Radius server/DHCPv6-Inf-Req is exchanged between the UE and the WLC.
SaMOG Gateway Dual-stack Support Over PMIPv6
The table below describes the steps in the message flow for dual-stack support over PMIPv6.
Table 9. SaMOG Gateway Dual-stack Support Over PMIPv6 Using SLAAC
Step
Description
1.
and
and SaMOG to P-GW.
2.
SaMOG receives the PDN-Type as IPv4, IPv6, or IPv4v6 in the APN-Profile during authentication with the Radius/AAA
Server.
Server.
3.
SaMOG starts S2a procedures based on the PDN-Type, towards P-GW/GGSN
4.
The WLC initiates PMIPv6 PBU by including the IPv4 Home Address and/or Home Network Prefix as per the received
PDN-Type in the Cisco-AVPair from SaMOG.
PDN-Type in the Cisco-AVPair from SaMOG.
5.
SaMOG provides the configuration parameters (DNS IPv4/IPv6 Addresses) in the PCO Mobility option of the PMIPv6
PBA.
PBA.
6.
UE triggers the sequence of messages using SLAAC or Stateful DHCPv6 to get the IPv6 prefix and DHCPv4 to get the
IPv4 address.
IPv4 address.