Manual

Cisco Packet Data Serving Node (PDSN) Release 2.0
Resource Management
12
12.3(11)T
• Maximum of 8000 IPSec tunnels with VPNSM hardware support (This figure is for the chassis,
IPSec resources are not linked with PDSN images on MWAM, it is a separate resource)
• Maximum call set up rate for a cluster with n members configured in a controller/member cluster
for Simple IP and Mobile IP Sessions with Release 2.0 Clustering enhancements.
Resource Management
Resource management defines the mechanism to release packet data session related resources at the
network elements like the PDSN and the HA. Resources may be released due to the session handoff or
for administrative purposes.
IS-835-C defines two mechanisms for resource management:
• Packet of Disconnect(POD)
• Mobile IP Resource Revocation
While resource management based on Packet of Disconnect is applicable to Simple IP, Mobile IP and
Proxy Mobile IP flows, resource management based on Mobile IP Resource revocation is applicabled
only to Mobile IP flows.
The Cisco PDSN supports resource management based on both Packet of Disconnect and Mobile IP
resource revocation.
Resource Revocation for Mobile IP
Basic Mobile IP resource revocation is an IS-835-C initiative that defines the methods by which a
mobility agent (one that provides Mobile IP services to a mobile node) can notify the other mobility
agent of the termination of a registration due to administrative reasons or MIP handoff.
When configured on the PDSN/FA, the Mobility Agent Advertisement extension in the Agent
advertisement will have the X bit set, thus advertising support for resource revocation on that link. A
PDSN configured to support resource revocation in Mobile IPv4 will include a revocation support
extension in all MIP RRQ including re-registrations. If the associated MIP RRP from the HA also
includes a valid revocation support extension, then the PDSN will assume the associated registration as
revocable.
For a registration that is revocable, if the PDSN/FA needs to terminate the session administratively, the
PDSN/FA sends a resource revocation message to the HA and releases the resources held for that
registration.
If the resource revocation ACK from the HA is not received within a configurable amount of time, the
resource revocation message will be retransmitted.
On receipt of a resource revocation message from Home Agent, and a registration (identified by the
home address, care-of address, and Home Agent address) is located, the resources held by that
registration are freed, and a resource revocation ACK message is sent back to the Home Agent. If no
other Mobile IP registrations are active on the PPP session associated with the revoked binding, then the
PDSN will release the associated PPP and R-P sessions for the revoked registration.
Restrictions for Registration Revocation
The following restrictions for Registration Revocation on the PDSN apply: