IP Multicast in a Wireless LAN
IP Multicast WLAN Configuration
The low-rate stream is allowed and the high-rate stream is disallowed on the P2P wireless link. To control what multicast traffic passes over the P2P link, only the ip multicast boundary configuration on ROUTER is needed. Because the multicast boundary prevents hosts from joining unwanted groups, the network never knows to forward unwanted traffic over the P2P link.
Testbed for Point-to-Point Wireless Network using Bridges
PC with 350 PC Card
VLAN 100 10.1.100.x
In this configuration:
L3-SWITCH (VLAN 100-10.1.100.1) connects to the campus network and the P2P wireless network.
The P2P wireless link is made possible by two Cisco Aironet 350 Bridges, 350-Bridge-L (10.1.100.100) and 350-Bridge-R (10.1.100.101).
ROUTER (10.1.100.2) connects to the P2P wireless network and the remote site network (10.1.101.1) via L2-SWITCH-PWR.
The laptop computer (10.1.101.2) is running the IP/TV Viewer software.
If the remote side of the P2P link has a Layer 2 switch and no Layer 3 switch or router, then a boundary can be placed on the VLAN 100 interface of L3-SWITCH2. Also, in a Point-to-Multipoint (P2MP) deployment, a mix of both may be needed. Both configurations are shown here for reference.
Following is the configuration for L3-SWITCH.
interface Vlan100 description VLAN for P2P Bridge ip address 10.1.100.1 255.255.255.0 ip pim sparse-mode ip multicast boundary IPMC-BRIDGE ! ip access-list standard IPMC-BRIDGE permit 126.96.36.199
Enables PIM on the interface. Boundary refers to named ACL “IPMC-BRIDGE.”
Permits low-rate stream (188.8.131.52).
To prevent unwanted IGMP messaging and multicast traffic from traversing the P2P wireless link on the receiver side (remote LAN - 10.1.101.x), an ip multicast boundary is configured on the Fast Ethernet 0/1 interface of ROUTER.
Cisco AVVID Network Infrastructure IP Multicast Design