Black Box LGB6026A, Management Manual

Page: 996 / 1289

– 994 –
C
HAPTER
41 | Multicast Filtering Commands
IGMP (Layer 3)
R
ELATED
C
OMMANDS
ip igmp version (997)
ip igmp query-interval (994)
ip igmp query-
interval
This command configures the frequency at which host query messages are
sent. Use the
no form to restore the default.
S
YNTAX
ip igmp query-interval seconds
no ip igmp query-interval
seconds - The frequency at which the switch sends IGMP host-query
messages. (Range: 1-255 seconds)
D
EFAULT
S
ETTING
125 seconds
C
OMMAND
M
ODE
Interface Configuration (VLAN)
C
OMMAND
U
SAGE
◆
Multicast routers send host query messages to determine the interfaces
that are connected to downstream hosts requesting a specific multicast
service. Only the designated multicast router for a subnet sends host
query messages, which are addressed to the multicast address
224.0.0.1, and uses a time-to-live (TTL) value of 1.
◆
For IGMP Version 1, the designated router is elected according to the
multicast routing protocol that runs on the LAN. But for IGMP Version 2
and 3, the designated querier is the lowest IP-addressed multicast
router on the subnet.
E
XAMPLE
The following shows how to configure the query interval to 100 seconds.
Console(config-if)#ip igmp query-interval 100
Console(config-if)#
R
ELATED
C
OMMANDS
ip igmp max-resp-interval (993)