How To Constrain Multicast In A Switched Ethernet Network; Configuring Switches For Ip Multicast; Configuring Igmp Snooping; Enabling Cgmp - Cisco Catalyst 3650 Configuration Manual

How to Constrain Multicast in a Switched Ethernet Network

How to Constrain Multicast in a Switched Ethernet Network

Configuring Switches for IP Multicast

If you have switching in your multicast network, consult the documentation for the switch you are working
with for information about how to configure IP multicast.

Configuring IGMP Snooping

No configuration is required on the router. Consult the documentation for the switch you are working with to
determine how to enable IGMP snooping and follow the provided instructions.

Enabling CGMP

CGMP is a protocol used on devices connected to Catalyst switches to perform tasks similar to those performed
by IGMP. CGMP is necessary because the Catalyst switch cannot distinguish between IP multicast data
packets and IGMP report messages, which are both at the MAC level and are addressed to the same group
address.
• CGMP should be enabled only on 802 or ATM media, or LAN emulation (LANE) over ATM.
Note
• CGMP should be enabled only on devices connected to Catalyst switches.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. ip cgmp [proxy | router-only]
5. end
6. clear ip cgmp [interface-type interface-number]
DETAILED STEPS
Command or Action
Step 1 enable
Example:
Device> enable
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
104
Constraining IP Multicast in Switched Ethernet
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
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