4-18
Multimedia Traffic Control with IP Multicast (IGMP)
How IGMP Operates
To view the IGMP Fast-Leave status of a port use the show running-config or
show configuration commands.
Setting Forced Fast-Leave Using the MIB
Fast-Leave and Forced Fast-Leave options for a port can also be set through
the switch’s MIB (Management Information Base).
Note on VLAN
Numbers
In the ProCurve switches covered in this guide, the walkmib and setmib
commands use an internal VLAN number (and not the VLAN ID, or VID) to
display or change many per-vlan features, such as the Forced Fast-Leave state.
Because the internal VLAN number for the default VLAN is always 1
(regardless of whether VLANs are enabled on the switch), and because a
discussion of internal VLAN numbers for multiple VLANs is beyond the scope
of this manual, this section concentrates on examples that use the default
VLAN.
Listing the MIB-Enabled Forced Fast-Leave Configuration
The Forced Fast-Leave configuration data is available in the switch’s MIB, and
includes the state (enabled or disabled) for each port and the Forced-Leave
Interval for all ports on the switch.
To List the Forced Fast-Leave State for all Ports in the Switch. In
the CLI, use the walkmib command, as shown below.
Syntax: [no] ip igmp fastleave <port-list>
Enables IGMP Fast-Leaves on the specified ports in the VLAN
(the default setting). In the Config context, use the VLAN
specifier, for example, vlan < vid > ip igmp fastleave <port-list>.
The “no” form disables Fast-Leave on the specified ports.
[no] ip igmp forcedfastleave <port-list>
Forces IGMP Fast-Leaves on the specified ports in the VLAN,
even if they are cascaded.
Feature Default Settings Function
Forced Fast-
Leave state
2
(disabled)
1 (enabled)
2 (disabled)
Uses the setmib command to enable or disable
Forced Fast-Leave on individual ports. When
enabled on a port, Forced Fast-Leave operates only
if the switch detects multiple end nodes (and at least
one IGMP client) on that port.
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