3Com 3C17705, User Manual

Page: 66 / 184

66 C
HAPTER
4: V
IRTUAL
LAN
S
(VLAN
S
)
Types of VLANs
The switch supports a maximum of 256 VLANs. VLANs can be created
according to the following criteria:
■
Physical port
■
802.1Q tag
■
Ethernet, LLC SAP, or LLC/SNAP Ethernet protocol type
■
A combination of these criteria
Port-Based VLANs In a port-based VLAN, a VLAN name is given to a group of one or more
ports on the switch. A port can be a member of only one port-based
VLAN.
config igmp snooping timer
<router_timeout> <host_timeout>
Configures the IGMP snooping timers. Timers
should be set to approximately 2.5 times the
router query interval in use on the network.
Specify the following:
■
router_timeout
— The interval, in
seconds, between the last time the router was
discovered and the current time. The range is
10 to 2,147,483,647 seconds (68 years). The
default setting is 260 seconds.
■
host_timeout
— The interval, in seconds,
between the last IGMP group report message
from the host and the current time. The range
is 10 to 2,147,483,647 seconds (68 years). The
default setting is 260 seconds.
show igmp snooping {<vlan <name>}
Displays IGMP snooping registration information,
and a summary of all IGMP timers and states.
disable igmp {vlan <name>}
Disables IGMP processing. No IGMP query is
generated, but the switch continues to respond to
IGMP queries received from other devices. If no
VLAN is specified, IGMP is disabled on all
interfaces.
disable igmp snooping
Disables IGMP snooping. IGMP snooping can be
disabled only if IP multicast routing is not being
used. Disabling IGMP snooping allows all IGMP
and IP multicast traffic to flood within a given
VLAN.
clear igmp snooping {vlan <name>}
Removes one or all IGMP snooping entries.
Table 18 IGMP Configuration Commands (continued)
Command Description