Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
ip igmp snooping source-only-learning
ip igmp snooping source-only-learning
Use the ip igmp snooping source-only-learning global configuration command to enable IP
multicast-source-only learning on the switch and optionally set the aging time of the forwarding-table
entries that are learned. Use the no form of this command to disable IP multicast-source-only learning
or to disable aging.
ip igmp snooping source-only-learning [age-timer value]
no ip igmp snooping source-only-learning [age-timer]
Syntax Description
Defaults IP multicast-source-only learning is enabled.
The aging feature is enabled. The default is 600 seconds (10 minutes).
Command Modes Global configuration
Command History
Usage Guidelines When IP multicast-source-only learning is enabled, the switch learns the IP multicast group from the IP
multicast data stream and only forwards traffic to the multicast router ports.
Note We strongly recommend that you do not disable IP multicast-source-only learning. IP
multicast-source-only learning should be disabled only if your network is not composed of IP
multicast-source-only networks and if disabling this learning method improves the network
performance.
In a source-only network, switch ports are connected to multicast source ports and multicast router ports.
The switch ports are not connected to hosts that send IGMP join or leave messages.
The switch learns about IP multicast groups from the IP multicast data stream by using the source-only
learning method. The switch forwards traffic only to the multicast router ports. You can disable
source-only learning by using the no ip igmp snooping source-only learning global configuration
command.
age-timer (Optional) Configure the aging time of the forwarding-table entries that the
switch learns by using the source-only learning method.
time Aging time is seconds. The range is 0 to 2880 seconds. If you set time to 0, aging
of the forward-table entries is disabled.
Release Modification
12.1(11)EA1 This command was introduced.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz