ip mobile revocation {interval <msec>|retransmits <number>
To enable packet trace for a given MAC address, use the following command:
ip mobile packet-trace <host MAC address>
Proxy Mobile IP
The proxy mobile IP module in a mobility-enabled switch detects when a mobile client has moved to a foreign
network and determines the home agent for a roaming client. The proxy mobile IP module performs the
following functions:
n Derives the address of the home agent for a mobile client from the HAT using the mobile client’s IP address.
If there is more than one possible home agent for a mobile client in the HAT, the proxy mobile IP module
uses a discovery mechanism to find the current home agent for the client.
n Detects when a mobile client has moved. Client moves are detected based on ingress port and VLAN
changes, and mobility is triggered accordingly. For faster roaming convergence between AP(s) on the same
switch, it is recommended that you keep the on-association option enabled. This helps trigger mobility as
soon as 802.11 association packets are received from the mobile client.
Revocations
A home agent or foreign agent can send a registration revocation message, which revokes registration service
for the mobile client. For example, when a mobile client roams from one foreign agent to another, the home
agent can send a registration revocation message to the first foreign agent so that the foreign agent can free
any resources held for the client.
IPv6 L3 Mobility
AOS-W supports IPv6 L3 Mobility functionality. The existing L3 mobility solution has been enhanced to
support dual stacked (IPv4 and IPv6) and pure IPv6 mobile clients. The IPv6 L3 mobility allows the wireless
clients to retain their IPv4 or IPv6 addresses across different VLANs within a switch and between different
switches. In the previous release, the Alcatel-Lucent Switches supported L3 mobility only for single stacked
IPv4 clients.
The following changes in the existing behavior is observed in the Alcatel-Lucent switch when you enable IPv6
L3 Mobility support :
n The switch throttles and proxies Router Advertisements (RAs) if the router mobile command is enabled.
The following command configures the maximum time allowed between sending unsolicited multicast router
advertisements from each interface when RA proxy is enabled:
(config)# ipv6 proxy-ra interval <180-1800>
The default value for proxy-ra interval is 600 seconds. If RA is configured on an external router, but not within
the switch, the switch stores the RA in cache and replays the RA from the external server and replays them
every proxy-ra interval. If RA is configured in both an external router and in the switch, clients serviced by the
switch receive RA only from the switch and not from the external router.
n L3 mobility support for wired and third-party APs are deprecated.
n The HA discovery on association parameter is turned on by default and is not configurable.
By enabling L3 mobility feature, both the solicited RAs and the unsolicited periodic RAs will be converted to L2 unicast
and sent to the wireless clients.
It is recommended to reboot the switch when you issue the no router mobile command so that mutlicast RAs do not
continue to get converted to unicast RAs.
AOS-W 6.5.3.x | User Guide IP Mobility | 673
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