Interface And Port Engineering Rules; Pi Interface Rules; Fa To Ha Rules; Ha To Fa - Cisco ASR 5000 Series Administration Manual

Engineering Rules

Interface and Port Engineering Rules

The rules discussed in this section pertain to both the Ethernet 10/100 and Ethernet 1000 Line Cards and the four-port
Quad Gig-E Line Card (QGLC; ASR 5000 only) and the type of interfaces they facilitate.

Pi Interface Rules

FA to HA Rules

When supporting Mobile IP, the system can be configured to perform the role of a FA, an HA, or both. This section
describes the engineering rules for the Pi interface when using the system as a FA.
The following engineering rules apply to the Pi interface between the FA and HA:
A Pi interface is created once the IP address of a logical interface is bound to an FA service.
The logical interface(s) that will be used to facilitate the Pi interface(s) must be configured within the egress
context.
FA services must be configured within the egress context.
If the system is configured as a FA is communicating with a system configured as an HA, then it is
recommended that the name of the context in which the FA service is configured is identical to the name of the
context that the HA service is configured in on the other system.
Each FA service may be configured with the Security Parameter Index (SPI) of the HA that it will be
communicating with over the Pi interface.
Multiple SPIs can be configured within the FA service to allow communications with multiple HAs over the Pi
interface. It is best to define SPIs using a netmask to specify a range of addresses rather than entering separate
SPIs. This assumes that the network is physically designed to allow this communication.
Depending on the services offered to the subscriber, the number of sessions facilitated by the Pi interface can be
limited.

HA to FA

The following engineering rules apply to the Pi interface between the HA and FA:
When supporting Mobile IP, the system can be configured to perform the role of a FA, an HA or both. This
section describes the engineering rules for the Pi interface when using the system as an HA.
A Pi interface is created once the IP address of a logical interface is bound to an HA service.
OL-22944-02
Cisco ASR 5000 Series Gateway GPRS Support Node Administration Guide ▄
Interface and Port Engineering Rules ▀