Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 507)

Brocade 6910 Ethernet Access Switch Configuration Guide 457
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IGMP Snooping
23
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• If immediate-leave is not used, a multicast router (or querier) will send a group-specific query
message when an IGMPv2/v3 group leave message is received. The router/querier stops
forwarding traffic for that group only if no host replies to the query within the time out period.
(The time out for this release is currently defined by Last Member Query Interval (fixed at one
second) * Robustness Variable (fixed at 2) as defined in RFC 2236.
• If immediate-leave is enabled, the switch assumes that only one host is connected to the
interface. Therefore, immediate leave should only be enabled on an interface if it is connected
to only one IGMP-enabled device, either a service host or a neighbor running IGMP snooping.
• This command is only effective if IGMP snooping is enabled, and IGMPv2 or IGMPv3 snooping
is used.
Example
The following shows how to enable immediate leave.
Console(config)#ip igmp snooping vlan 1 immediate-leave
Console(config)#
ip igmp snooping vlan last-memb-query-count
This command configures the number of IGMP proxy group-specific or group-and-source-specific
query messages that are sent out before the system assumes there are no more local members.
Use the no form to restore the default.
Syntax
ip igmp snooping vlan vlan-id last-memb-query-count count
no ip igmp snooping vlan vlan-id last-memb-query-count
vlan-id - VLAN ID (Range: 1-4093)
count - The number of proxy group-specific or group-and-source-specific query messages
to issue before assuming that there are no more group members. (Range: 1-255)
Default Setting
2
Command Mode
Global Configuration
Command Usage
This command will take effect only if IGMP snooping proxy reporting or IGMP querier is enabled
(
page 450 ).