12-15
Multimedia Traffic Control with IP Multicast (IGMP)
How IGMP Operates
Configuration Options for Forced Fast-Leave
Note on VLAN
Numbers:
In the HP Procurve Switches 2650 and 6108, 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
document, the discussion here concentrates on examples that use the default
VLAN.
Listing the Forced Fast-Leave Configuration
The Forced Fast-Leave configuration data is available in the switch’s MIB
(Management Information Base), 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. Go to
the switch’s command prompt and use the
walkmib command, as shown below.
1. From the Main Menu, select:
5. Diagnostics . . .
4. Command Prompt
2. Do one of the following:
• If VLANs are not enabled on the switch, go to step 3.
• If VLANs are enabled on the switch:
i. You will be prompted to select a VLAN. For example:
ii. Because you can list the Forced Fast-Leave state for all ports on
the switch from any VLAN, just press to select the displayed
VLAN.
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.
!Software.book Page 15 Thursday, October 10, 2002 6:10 PM
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