provides PDN Gateway-specific engineering rules or guidelines that must be
considered prior to configuring the ASR 5500 for your network deployment.
General and network-specific rules are located in the appendix of the
Administration and Configuration Guide for the specific network type.
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.
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.
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
interface(s) that will be used to facilitate the S2a interface(s) must be
configured within an ingress context.
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.
engineering rule applies to the S5/S8 interface from the P-GW to the S-GW:
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.
P-GW Context and
engineering rules apply to services configured within the system:
A maximum of 256
services (regardless of type) can be configured per system.
Large numbers of
services greatly increase the complexity of management and may impact overall
system performance (i.e. resulting from such things as system handoffs).
Therefore, it is recommended that a large number of services only be configured
if your application absolutely requires it. Please contact your local service
representative for more information.
supports unlimited peer HSGW/MAG addresses per P-GW.
maintains statistics for a maximum of 8192 peer HSGWs per P-GW service.
If more than
8192 HSGWs are attached, older statistics are identified and overwritten.
not support any peer level statistics (per MAG level statistics).
supports 65,000 S-GW addresses per P-GW.
maintains statistics for all peer S-GWs per P-GW service.
maintains statistics for a maximum of 64,000 peer P-GWs per HSGW or S-GW
There are a
maximum of 8 P-GW assignment tables per context and per chassis.
The total number
of entries per table and per chassis is limited to 256.
engineering rule applies to subscribers configured within the system:
subscriber templates may be configured on a per P-GW service.