Dell W-7005 AOS 6.4.x User Guide - Page 700

Revocations, IPv6 L3 Mobility, Multicast Mobility

Page 700 highlights

l 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. l 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 controller, 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 ArubaOS 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 controller and between different controllers. In the previous release, the Dell Controllers supported L3 mobility only for single stacked IPv4 clients. The following changes in the existing behavior is observed in the Dellcontroller when you enable IPv6 L3 Mobility support : l The controller 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 The default value for proxy-ra interval is 600 seconds. If RA is configured on an external router, but not within the controller, the controller 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 controller, clients serviced by the controller receive RA only from the controller and not from the external router. l L3 mobility support for wired and third-party APs are deprecated. l 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 controller when you issue the no router mobile command so that mutlicast RAs do not continue to get converted to unicast RAs. Multicast Mobility Multicast mobility ensures a client gets an uninterrupted multicast stream while roaming. ArubaOS provides support for a MLD proxy to enable IPv6 multicast mobility. To achieve multicast mobility, the Home Agent (HA) and the Foreign Agent (FA) must be capable of MLD proxying by exchanging the MLD membership information and process MLD messages. ArubaOScontroller supports MLD versions v1 and v2. 700 | IP Mobility Dell Networking W-Series ArubaOS 6.4.x | User Guide

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700
| IP Mobility
Dell Networking W-Series ArubaOS 6.4.x | User Guide
l
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.
l
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
controller, 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
ArubaOS 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 controller and between different
controllers. In the previous release, the Dell Controllers supported L3 mobility only for single stacked IPv4
clients.
The following changes in the existing behavior is observed in the Dellcontroller when you enable IPv6 L3
Mobility support :
l
The controller 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 controller, the controller 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 controller, clients serviced
by the controller receive RA only from the controller and not from the external router.
l
L3 mobility support for wired and third-party APs are deprecated.
l
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 controller when you issue the
no router mobile
command so that mutlicast RAs do
not continue to get converted to unicast RAs.
Multicast Mobility
Multicast mobility ensures a client gets an uninterrupted multicast stream while roaming. ArubaOS provides
support for a MLD proxy to enable IPv6 multicast mobility. To achieve multicast mobility, the Home Agent (HA)
and the Foreign Agent (FA) must be capable of MLD proxying by exchanging the MLD membership information
and process MLD messages. ArubaOScontroller supports MLD versions v1 and v2.