P-GW Engineering Rules
▀ Interface and Port Rules
▄ Cisco ASR 5x00 Packet Data Network Gateway Administration Guide
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Interface and Port Rules
The rules discussed in this section pertain to the Ethernet 10/100 line card, the Ethernet 1000 line card and the four-port
Quad Gig-E line card and the type of interfaces they facilitate, regardless of the application.
S2a Interface Rules
This section describes the engineering rules for the S2a interface for communications between the Mobility Access
Gateway (MAG) service residing on the HSGW and the Local Mobility Anchor (LMA) service residing on the P-GW.
LMA to MAG
The following engineering rules apply to the S2a interface from the LMA service to the MAG service residing on the
HSGW:
An S2a interface is created once the IP address of a logical interface is bound to an LMA service.
The logical interface(s) that will be used to facilitate the S2a interface(s) must be configured within an ingress
context.
LMA services must be configured within an ingress context.
Depending on the services offered to the subscriber, the number of sessions facilitated by the S2ainterface can be
limited in order to allow higher bandwidth per subscriber.
S5/S8 Interface Rules (GTP)
The following engineering rule applies to the S5/S8 interface from the P-GW to the S-GW:
P-GW preserves an IP address between S2a interface (PMIPv6) and S5/S8 interface (GTP) when the user moves
between Wi-Fi and LTE if a common P-GW is used as the anchor point between the two services.
