3com 4210 User Manual

C

HAPTER

 16: M

ULTICAST

 C

ONFIGURATION

 G

UIDE

When users receive VOD information through multicast, the information receiving 
mode may vary depending on user requirements:

1 To avoid flooding of the video information at Layer 2, IGMP Snooping needs to be 

enabled on Switch E, through which Host A and Host B receive the multicast data.

2 To ensure reliable and stable reception of multicast data, Switch B and Switch C 

provide link backup for the directly attached stub network N1, which comprises 
multicast receivers Host C and Host D.

3 The PIM-SM domain as a single-BSR domain, and OSPF runs in the domain for 

unicast routing.

1 Switch D connects to the network that comprises the multicast source (Source) 

through VLAN-interface 300.

2 Switch A connects to Switch F through VLAN-interface 100, and to Switch D and 

Switch E through VLAN-interface 101 and VLAN-interface 102 respectively.

3 Switch B and Switch C connect to stub network N1 through their respective 

VLAN-interface 200, and to Switch E through VLAN-interface 103 and 
VLAN-interface 104 respectively.

4 Both VLAN-interface 105 of Switch D and VLAN-interface 102 of Switch E serve as 

C-BSRs and C-RPs.

5 Enable IGMPv2 on VLAN-interface 100 of Switch A. On Switch F, enable IGMP 

Snooping globally and in VLAN 100. Run IGMPv2 on Switch B and Switch C for 
group management on stub network N1. Typically, Switch B acts as the querier 
because its interface on the multi-access subnet has a lower IP address.

Configure the IP address and subnet mask for each interface as per Figure 39. The 
detailed configuration steps are omitted here.

Configure OSPF for interoperation among the switches in the PIM-SM domain. 
Ensure the network-layer interoperation among Switch A, Switch B, Switch C, 
Switch D and Switch E in the PIM-SM domain and enable dynamic update of 
routing information among the switches through a unicast routing protocol. The 
specific configuration steps are omitted here.

# Enable IP multicast routing on Switch A, enable PIM-SM on each interface, and 
run IGMPv2 on VLAN-interface 100.

<SwitchA> system-view

[SwitchA] multicast routing-enable

[SwitchA] interface Vlan-interface 100

Switch 5500

Release V03.02.04 

All versions 

Switch 5500G

Release V03.02.04 

All versions