AOS-W 6.5.3.x | User Guide IP Mobility | 663
Chapter 27
IP Mobility
A mobility domain is a group of Alcatel-Lucent switches among which wireless users can roam without losing
their IP address. Mobility domains are not tied with the master switch; thus, it is possible for a user to roam
between switches managed by different master switches, as long as all the switches belong to the same
mobility domain.
You enable and configure mobility domains only on Alcatel-Lucent switches. No additional software or
configuration is required on wireless clients to allow roaming within the domain.
Topics in this chapter include:
n Understanding Alcatel-Lucent Mobility Architecture on page 663
n Configuring Mobility Domains on page 664
n Tracking Mobile Users on page 668
n Configuring Advanced Mobility Functions on page 670
n Understanding Bridge Mode Mobility Deployments on page 679
n Enabling Mobility Multicast on page 680
Understanding Alcatel-Lucent Mobility Architecture
Alcatel-Lucent’s layer-3 mobility solution is based on the Mobile IP protocol standard, as described in RFC 3344,
IP Mobility Support for IPv4. This standard addresses users who need both network connectivity and mobility
within the work environment.
Unlike other layer-3 mobility solutions, an Alcatel-Lucent mobility solution does not require that you install
mobility software or perform additional configuration on wireless clients. The Alcatel-Lucentswitches perform
all functions that enable clients to roam within the mobility domain.
In a mobility domain, a mobile client is a wireless client that can change its point of attachment from one
network to another within the domain. A mobile client receives an IP address (a home address) on a home
network.
A mobile client can detach at any time from its home network and reconnect to a foreign network (any network
other than the mobile client’s home network) within the mobility domain. When a mobile client is connected to
a foreign network, it is bound to a care-of address that reflects its current point of attachment. A care-of
address is the IP address of the Alcatel-Lucent switch in the foreign network with which the mobile client is
associated.
The home agent for the client is the switch at which the client appears for the first time upon joining the
mobility domain. The home agent is the single point of contact for the client when the client roams. The foreign
agent for the client is the switch which handles all Mobile IP communication with the home agent on behalf of
the client. Traffic sent to a client’s home address is intercepted by the home agent and tunneled for delivery to
the client on the foreign network. On the foreign network, the foreign agent delivers the tunneled data to the
mobile client.
Figure 87 shows the routing of traffic from Host A to Mobile Client B when the client is away from its home
network. The client’s care-of address is the IP address of the Alcatel-Lucent switch in the foreign network.
The numbers in the Figure 87 correspond to the following descriptions:
1. Traffic to Mobile Client B arrives at the client’s home network via standard IP routing mechanisms.
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