Command Purpose
show ip igmp group-ext member-
subnet<A.B.C.D/<0–32>>
Display the IGMP group extended details for
the selected member subnet
show ip igmp group-ext source
<A.B.C.D>
Display the IGMP group extended details for
the selected source address.
show ip igmp interface Display IGMP interface information.
show ip igmp interface vlan
<1–4094>
Display IGMP interface information for the
selected VLAN.
show ip igmp router-alert Display router-alert settings.
show ip igmp router-alert vlan
<1–4094>
Display router-alert settings for the selected
VLAN.
show ip igmp snooping Display IGMP snooping information
vlan igmp <VID> snooping
enable
Enable IGMP snooping on each appropriate
VLAN.
vlan igmp <VID> proxy enable Enable IGMP proxy on each appropriate
VLAN.
show vlan igmp <VID> Show IGMP information for each appropriate
VLAN.
Configure a port
Perform the commands in the following table to configure a port.
Command
Purpose
interface fastEthernet<end-user
port list>
Enter configuration mode at the interface
level where you can configure multiple ports,
excluding uplink ports, simultaneously.
auto-negotiation-
advertisements 10-full 10-
half 100-full 100-half pause-
frame
Set 10/100 ports to advertise only 10Mb/s
half duplex and 100Mb/s half duplex.
default auto-negotiation-
advertisement
To advertise gigabit for gigabit ports because
Custom Autonegotiation Advertisements
(CANA) is not appropriate for gigabit ports.
poe poe-shutdown Because Power Over Ethernet (PoE) is on by
default, use this command to disable PoE on
non-PoE ports.
Configure a port
Fundamentals December 2011 79