Example for Configuring Layer 2 Multicast Entry Limit in a VLAN Scenario

This section provides an example for configuring Layer 2 multicast entry limit in a VLAN scenario.

Networking Requirements

On the network shown in Figure 1, IPTV services are deployed on the VLAN network, and a CE is connected to the upper layer network through a PE and finally accesses the IPTV server. The CE is downlinked to a residential network VLAN 100.

To save link bandwidth on the VLAN network, configure Layer 2 multicast entry limit on the CE as required after fully evaluating the network capability.

The required Layer 2 multicast entry limit configurations on the CE are as follows:

A maximum of 10 multicast group members can join VLAN 100.
Limit the number of multicast groups on the downstream interface GE 0/1/1 as follows:
- Limit the number of multicast groups in VLAN 100 to 10.

Figure 1 Configuring Layer 2 multicast entry limit in a VLAN scenario

Interface 1 in this example represents GE 0/1/1.

Configuration Roadmap

The configuration roadmap is as follows:

Configure VLAN 100 on the CE so that downstream subscribers can receive multicast data.
Enable IGMP snooping globally and in the VLAN to implement on-demand multicast data distribution in the VLAN and reduce bandwidth consumption at both the user side and network side.
Configure Layer 2 multicast entry limit for VLAN 100 and for GE 0/1/1 to control the multicast group numbers.

Data Preparation

To complete the configuration, you need the following data:

VLAN ID of the residential network attached to the CE: 100
Maximum numbers of Layer 2 multicast entries

Procedure

Configure a VLAN.

# Configure VLAN 100 on the CE.

<HUAWEI> system-view
[~HUAWEI] sysname CE
[*HUAWEI] commit
[~CE] interface gigabitethernet 0/1/1
[~CE-GigabitEthernet0/1/1] portswitch
[*CE-GigabitEthernet0/1/1] undo shutdown
[*CE-GigabitEthernet0/1/1] quit
[*CE] vlan 100
[*CE-vlan100] port gigabitethernet 0/1/1
[*CE-vlan100] quit
[*CE] commit

Enable IGMP snooping.

# Enable IGMP snooping globally on the CE.

[~CE] igmp-snooping enable
[*CE] commit

# Enable IGMP snooping in VLAN 100.

[~CE] vlan 100
[~CE-vlan100] igmp-snooping enable
[*CE-vlan100] quit
[*CE] commit

Configure Layer 2 multicast entry limit for the VLAN.
# Configure the CE.
```
[~CE] l2-multicast limit max-entry 10 vlan 100
[*CE] commit
```

Configure Layer 2 multicast entry limit for a specified VLAN on an interface.

# Configure Layer 2 multicast entry limit for VLAN 100 on GE 0/1/1 of the CE.

[~CE] interface gigabitethernet 0/1/1
[~CE-GigabitEthernet0/1/1] l2-multicast limit max-entry 10 vlan 100
[*CE-GigabitEthernet0/1/1] quit
[*CE] commit

Verify the configuration.

After completing the configurations, run the display l2-multicast limit command on the CE. The command output shows Layer 2 multicast entry limit configurations.

[~CE] display l2-multicast limit
L2-multicast limit information
------------------------------------------------------------------------------
                                               ConfigEntries 
                                               CurrentEntries
------------------------------------------------------------------------------
VLAN 100 limit information:
------------------------------------------------------------------------------
                                               10           
                                               0  
interface GigabitEthernet0/1/1 VLAN 100 limit information:
------------------------------------------------------------------------------
                                               10           
                                               0

Configuration Files

CE configuration file

#
 sysname CE
#
 vlan batch 100
#
 igmp-snooping enable
 l2-multicast limit max-entry 10 vlan 100
#
vlan 100
 igmp-snooping enable
#
interface GigabitEthernet0/1/1
 portswitch
 undo shutdown
 port default vlan 100
 l2-multicast limit max-entry 10 vlan 100
#
return