This appendix
provides PDN Gateway-specific engineering rules or guidelines that
must be considered prior to configuring the ASR 5x00 for your network
deployment. General and network-specific rules are located in the
appendix of the System 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.
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.
P-GW Context and
Service Rules
The following
engineering rules apply to services configured within the system:
A maximum of 256 services
(regardless of type) can be configured per system.
CAUTION:
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.
The system supports
unlimited peer HSGWs or S-GWs addresses per P-GW.
The system maintains
statistics for a maximum of 8192 peer HSGWs or S-GWs per P-GW service.
If more than 8192 HSGWs
or S-GWs are attached, older statistics are identified and overwritten.
The system maintains
statistics for a maximum of 4096 peer P-GWs per HSGW or S-GW service.
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.
P-GW Subscriber
Rules
The following
engineering rule applies to subscribers configured within the system:
Default subscriber
templates may be configured on a per P-GW service.