Users Guide

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410 | IP Mobility Dell PowerConnect ArubaOS 5.0 | User Guide
router. When Proxy IGMP is enabled, all multicast clients not associated with the controller are hidden from the
upstream multicast device or router.
IGMP proxy must be enabled or disabled on each individual interface. To use the IGMP proxy ensure that the
VLANs on the controllers are extended to the upstream router. Enabling IGMP proxy enables IGMP on the
interface and sets the querier to the controller itself. You must identify the controller port from which the
controller sends proxy join information to the upstream router, and identify the upstream router by ip address or
by upstream port so the controller can dynamically update the upstream multicast router information.
Inter-controller Mobility
When a client moves from one controller to another, multicast traffic migrates as follows:
1. The local controller uses its VLAN 10 IP address to join multicast group1 on behalf of a mobile client.
2. The mobile client leaves its local controller and roams to VLAN 50 remote controller A.
Remote controller A locates the mobile client's local controller and learns about the client's multicast groups.
Remote controller A then joins group1 on behalf the mobile client, using its VLAN 50 source IP. Upstream
multicast traffic from the roaming client is sent to the local controller over an IPIP tunnel. The remote
controller will receive downstream multicast traffic and send it to the mobile client.
Meanwhile, the local controller checks to see if other local clients require group1 traffic. If no other clients are
interested in group1, then the local controller will leave that group. If there are other clients using that group,
the controller it will continue its group1 membership.
3. Now the mobile client leaves remote controller A and roams to VLAN 100 on remote controller B. Remote
controller B locates he mobile client's local controller and learns about the client's multicast groups. Remote
controller B then joins group1 on behalf the roaming mobile client 1, using its VLAN 100 IP address.
Both the local controller and remote controller A will check to see if any of their other clients require group1
traffic. If none of their other clients are interested in group1, then that controller will leave the group. (If the
Note: The newer IGMP proxy feature and the older IGMP snooping feature cannot be enabled at the same time, as both features
add membership information to multicast group table. For most multicast deployments, you should enable the IGMP Proxy feature
on all VLAN interfaces to manage all the multicast membership requirements on the controller. If IGMP snooping is configured on
some of the interfaces, there is a greater chance that multicast information transfers may be interrupted.
Remote controller A
Remote controller B