Cisco 2950G 24 - Catalyst Switch Software Configuration Manual page 400
Desktop switch
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Also See for 2950G 24 - Catalyst Switch:
- Migration manual (25 pages) ,
- Datasheet (19 pages) ,
- Product support bulletin (5 pages)
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Configuring IGMP Snooping
If you disable IP multicast-source-only learning with the ip igmp snooping source-only-learning
global configuration command, the switch floods unknown multicast traffic to the VLAN and sends the
traffic to the CPU until the traffic becomes known. When the switch receives an IGMP report from a
host for a particular multicast group, the switch forwards traffic from this multicast group only to the
multicast router ports.
We strongly recommend that you do not disable IP multicast-source-only learning. You should disable
Note
IP multicast-source-only learning only if your network is not composed of IP multicast-source-only
networks and if disabling this learning method improves the network performance.
Beginning in privileged EXEC mode, follow these steps to disable IP multicast-source-only learning:
Command
Step 1
configure terminal
Step 2
no ip igmp snooping source-only-learning
Step 3
end
Step 4
show running-config | include
source-only-learning
Step 5
copy running-config startup-config
To enable IP multicast-source-only learning, use the ip igmp snooping source-only-learning global
configuration command.
This example shows how to disable IP multicast-source-only learning and to verify the configuration:
Switch# configure terminal
Switch(config)# no ip igmp snooping source-only-learning
Switch(config)# end
Switch# show running-config | include source-only-learning
Current configuration : 1972 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Switch
!
enable password my_password
!
ip subnet-zero
no ip igmp snooping source-only-learning
!
!
spanning-tree extend system-id
no spanning-tree vlan 1
!
!
interface FastEthernet0/1
no ip address
!
<output truncated>
Catalyst 2950 Desktop Switch Software Configuration Guide
17-10
Chapter 17
Purpose
Enter global configuration mode
Disable IP multicast-source-only learning.
Return to privileged EXEC mode.
Verify that IP multicast-source-only learning is disabled.
(Optional) Save your entries in the configuration file.
Configuring IGMP Snooping and MVR
78-14982-01
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Troubleshooting
