Black Box LGB6026A, Management Manual

Page: 995 / 1289

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C
HAPTER
41 | Multicast Filtering Commands
IGMP (Layer 3)
C
OMMAND
U
SAGE
When the switch receives an IGMPv2 or IGMPv3 leave message from a host
that wants to leave a multicast group, source or channel, it sends a
number of group-specific or group-source-specific query messages at
intervals defined by this command. If no response is received after this
period, the switch stops forwarding for the group, source or channel.
E
XAMPLE
Console(config)#interface vlan 1
Console(config-if)#ip igmp last-member-query-interval 20
Console(config-if)#
ip igmp max-resp-
interval
This command configures the maximum response time advertised in IGMP
queries. Use the
no form of this command to restore the default.
S
YNTAX
ip igmp max-resp-interval seconds
no ip igmp max-resp-interval
seconds - The report delay advertised in IGMP queries.
(Range: 0-255 tenths of a second)
D
EFAULT
S
ETTING
100 (10 seconds)
C
OMMAND
M
ODE
Interface Configuration (VLAN)
C
OMMAND
U
SAGE
◆
IGMPv1 does not support a configurable maximum response time for
query messages. It is fixed at 10 seconds for IGMPv1.
◆
By varying the Maximum Response Interval, the burstiness of IGMP
messages passed on the subnet can be tuned; where larger values
make the traffic less bursty, as host responses are spread out over a
larger interval.
◆
The number of seconds represented by the maximum response interval
must be less than the Query Interval (
page 994 ).
E
XAMPLE
The following shows how to configure the maximum response time to 20
seconds.
Console(config-if)#ip igmp query-max-response-time 200
Console(config-if)#