Introduction Configuring IGMP
Software Reference for SwitchBlade x3100 Series Switches (Internet Group Management
Protocol (IGMP))
5-22
SNOOPING-
MODE
This option is used when defining IGMPSNOOPING for
an interface or set of interfaces.
INTERNAL - The system will reconfigure HW to limit
the forwarding of multicast packets only to the inter-
face(s) that have expressed interest in the multicast
group. IGMP Snooping will perform it's normal process-
ing actions, such as source MAC validation of IGMP
Leaves AND set-top-box mobility.
EXTERNAL - The system will reconfigure HW to limit
the forwarding of multicast packets only to the inter-
face(s) that have expressed interest in the multicast
group. IGMP Snooping will perform modified processing
actions, such as skipping source MAC validation of
IGMP Leaves AND set-top-box mobility. This mode will
allow an IGMP Snooper behind these interface(s).
MCPASSTHROUGH - The system will NOT reconfig-
ure HW to limit the forwarding of multicast packets
only to the interface(s) that have expressed interest in
the multicast group. Instead, the system will FLOOD all
multicast traffic, that is received from a MC router, to
all interface(s) in the same VLAN AND that are in
MCPASSTHROUGH mode. *NOTE: This mode is
ONLY supported on NETWORK direction interface(s).
FLOODUN-
KNOWNS
Indicates whether the unknown multicast packets will
be flooded or dropped.
ROUTER-
AGEING-
TIMER
Specifies how long to wait before cleaning up ALL IGMP
related information associated with a learned multicast
router. If no multicast related packets have been
received, on the port we learned the router on, (IGMP
general query packets, OSPF multicast hello, PIMv1/
PIMv2, or DVMRP), all associated IGMP information will
be cleaned up.
300 seconds (5
minutes)
GENQUERY-
TIMER
Allows you to specify how long after an IGMP general
query is received, before the switch cleans up any non-
IGMP reporting subscriber devices.
20 seconds
Option Description Default Value
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