Cisco Cisco Catalyst 6000 Multilayer Switch Feature Card MSFC2 Bulletins
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The foreign controller has connectivity to the same VLAN that the client is on. In this case, the foreign controller will become the anchor
controller for the client, and the client will continue to receive the multicast stream.
controller for the client, and the client will continue to receive the multicast stream.
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Another client on the foreign controller that is on the same WLAN as the roaming client is already receiving the same multicast stream.
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All controllers attached to the same VLAN will forward the same multicast packet to the LWAPP multicast group. This will result in multiple
copies of the multicast packet being sent to the LWAPP multicast group. However, access points will only pick up the multicast packet that was
sourced from the controller they are currently joined to; the other copies are discarded. Therefore, only one copy of the multicast packet will be
transmitted over the air to wireless clients.
sourced from the controller they are currently joined to; the other copies are discarded. Therefore, only one copy of the multicast packet will be
transmitted over the air to wireless clients.
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The multicast performance enhancements are not available on Cisco 4100 Series wireless LAN controllers, Airespace 4000 Series wireless
switches, and Airespace 4100 Series wireless LAN appliances.
Benefits of Multicast Performance Improvements
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Improved multicast performance enables high-bandwidth multicast applications, such as Cisco IP/TV, to work over wireless networks
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Multicast packet replication occurs only at points in the network where it is required, saving wired network bandwidth
Wireless LAN Controllers Supported: Cisco 2000 and 4400 series wireless LAN controllers; Cisco WiSM; Cisco WLCM for integrated
services routers
Access Points Supported: Cisco Aironet 1000, 1130, 1230, 1240, and 1500 series lightweight access points
Management Interfaces Supported: Cisco WCS, controller web user interface, command line interface
Link Aggregation for the Cisco 4400 Series and the Cisco WiSM
Link aggregation is an effective way to create a high-speed connection between Cisco 4400 Series wireless LAN controllers and the network
infrastructure. Link aggregation allows load sharing of traffic among the links in the channel, as well as redundancy if one or more links in the
channel fails. Configuration and design is also simplified—only a single AP-Manager interface is required, backup interfaces are not required, and
the total bandwidth of the link aggregation bundle is available to all interfaces.
Link aggregation uses Cisco EtherChannel
®
to combine all four physical Ethernet ports on a Cisco 4404 Wireless LAN Controller (or two on a 4402)
into one logical channel, called a link aggregation bundle. See Figures 7 and 8 below.
Figure 7. Link Aggregation on the Cisco 4402
Figure 8. Link Aggregation on the Cisco 4404