Users Guide

Dell PowerConnect ArubaOS 5.0 | User Guide IP Mobility | 407
Registration Requests
Retransmits
Maximum number of times the foreign agent attempts mobile IP registration message exchanges
before giving up. The range of allowed values for this option is 0-5 attempts. The default setting is
3 attempts.
Registration Requests
Interval
Retransmission interval, in milliseconds. The range of allowed values for this option is 100-10000
milliseconds, inclusive. The default setting is 1000 milliseconds.
Home Agent
Replay Time difference, in seconds, for timestamp-based replay protection, as described by RFC 3344,
“IP Mobility Support for IPv4”. 0 disables replay. The range of allowed values is 0-
5000 seconds. The default setting is 5000 seconds.
Max. Binding Allowed Maximum number of mobile IP bindings. Note that there is a license-based limit on the number of
users and a one user per binding limit in addition to unrelated users. This option is an additional
limitation to control the maximum number of roaming users. When the limit is reached,
registration requests from the foreign agent fail which causes a mobile client to set a new
session on the visited controller, which will become its home controller.
The range of allowed values is 0-300 seconds. The default setting is 7 seconds.
Proxy Mobile IP
Trigger Mobility on Station
Association
If enabled, mobility move detection is performed when the client associates with the controller
instead of when the client sends packets.
This option is enabled by default. Mobility on association can speed up roaming and improve
connectivity for devices that do not send many uplink packets out that can trigger mobility. The
downside to this option is lowered security; an association is all it takes to trigger mobility,
however, this is irrelevant unless layer-2 security is enforced.
Stand Alone AP Support Enables support for third party or standalone APs. When this is enabled, broadcast packets are
not used to trigger mobility and packets from untrusted interfaces are accepted.
If mobility is enabled, you must also enable standalone AP for the client to connect to the
controller’s untrusted port. If the controller learns wired users via the following methods, enable
standalone AP:
z Third party AP connected to the controller through the untrusted port.
z Clients connected to ENET1 on the W-AP92.
z Wired user connected directly to the controller’s untrusted port.
NOTE: When IP mobility is enabled, you must also enable the Stand Alone AP Support option so
that a Mux server can perform properly and display all wired users who are connected to a Mux
port.
Mobility Trail Logging Enables logging at the notification level for mobile client moves.
Roaming for Authenticated
Stations Only
Allows a client to roam only if has been authenticated. If a client has not been authenticated, no
mobility service is offered if it roams to a different VLAN or controller.
Blocking DHCP Release from
stations
Determines whether DHCP release packets generated from the client should be dropped or
forwarded to the DHCP server. Blocking the packets prevents the DHCP server from assigning
the same IP address to another client until the lease has expired.
Re-Homing for Voice Capable
Client
Allows on-hook phones to be assigned a new home agent. This is to load balance voice client
home agents across controllers in a mobility domain.
This parameter requires that you install the Policy Enforcement Firewall Next Generation
(PEFNG) license in the controller, and is disabled by default.
Max. Station Mobility Events
per Second
Maximum number of mobility events (events that can trigger mobility) handled per second.
Mobility events above this threshold are ignored. This helps to control frequent mobility state
changes when the client bounces back and forth on APs before settling down.
The allowed range of values is 1-65535 events, and the default value is 25 events.
Station Trail Timeout Specifies the maximum interval, in seconds, an inactive mobility trail is held. The allowed range
of values is 120-86400 seconds, and the default value is 3600 seconds.
Table 80 IP Mobility Configuration Parameters
Parameter Description