Cisco Support Community
The objective of this article is to show how to enable IGMP Snooping on ESW500 Series Switches. Multicast is the network layer technique of transmitting data packets from one host to other selected hosts. However, at the lower layer the switch broadcasts the multicast traffic on all ports, even if only one host wants to receive it. IGMP Snooping is used to forward IPv4 multicast traffic only to the desired host.
When the IGMP snooping is enabled on the switch, it snoops (detects) the IGMP messages exchanged between the IPv4 router and the multicast hosts attached on the interface. It maintains a table that restricts IPv4 multicast traffic to dynamically forward only to those ports that want to receive it. IGMP Snooping enables the device to determine which hosts to receive Multicast traffic.
• ESW500 Series Switches
Defining IGMP Snooping Properties
Step 1. Log in to the web configuration utility and choose VLAN & Port Settings > Multicast > IGMP Snooping. The IGMP Snooping Page opens up.
Step 2. Check the check box to Enable IGMP Snooping, to monitor the network traffic and also to know which host want to receive the multicast traffic.
Step 3. Click the Edit button.The Edit IGMP Snooping window appears:
Step 4. Choose an ID from the VLAN ID drop-down list. It indicates the VLAN ID on which the IGMP Snooping is applied.
Step 5. Choose Enable from the IGMP Status Enable drop-down list. This indicates whether IGMP Snooping is enabled on the specific VLAN.
Step 6. Choose Enable from the Auto-Learn drop-down list. It automatically learn where other Multicast groups are located.
Step 7. Enter a value in the Host Timeout field. This defines the amount of time in seconds the Host needs to receive a message before it times out.
Step 8. Enter a value in the MRouter Timeout field. This defines the amount of time in seconds the Multicast router needs to receive a message before it times out.
Step 9. Click the radio button in the Leave Timeout field. The Leave Timeout value is either user-defined or an Immediate Leave value. It defines the amount of time the Host needs after it requests to leave the IGMP group. Before it times out, it will not receive a Join message from another station.
Step 10. Click Apply.