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ISCOM2600G-HI (A) Series Configuration Guide
Configurations of basic function take effect on IGMP Snooping or IGMP MVR
concurrently.
The concepts related to IGMP basic functions are as below.
Multicast router interface
The router interface can be learnt dynamically (learnt through IGMP query packets, on the
condition that the multicast routing protocol is enabled on multicast routers) on Layer 2
multicast switch, or configured manually to forward downstream multicast report and leave
packets to the router interface.
The router interface learnt dynamically has an aging time, while the router interface
configured manually will not be aged.
Aging time
The configured aging time takes effect on both multicast forwarding entries and the router
interface.
On Layer 2 switch running multicast function, each router interface learnt dynamically starts a
timer, of which the expiration time is the aging time of IGMP Snooping. The router interface
will be deleted if no IGMP Query packets are received in the aging time. The timer of the
router interface will be updated when an IGMP Query packet is received.
Each multicast entry starts a timer, namely, the aging time of a multicast member. The
expiration time is IGMP Snooping aging time. The multicast member will be deleted if no
IGMP Report packets are received in the aging time. Update timeout for multicast entry when
receiving IGMP Report packets. The timer of the multicast entry will be updated when an
IGMP Report packet is received.
Immediate leave
On Layer 2 switch running multicast function, the system will not delete the corresponding
multicast entry immediately, but wait until the entry is aged after sending Leave packets. You
can enable this function to delete the corresponding multicast entry quickly when there are a
large number of downstream users and adding or leaving is more frequently required.
IGMPv2/v3 supports immediate leave.
IGMP ring network forwarding
On Layer 2 switch running multicast function, IGMP ring network forwarding can be enabled
on any type of interfaces.
Enabling IGMP ring network forwarding can implement multicast backup protection on the
ring network, make multicast services more stable, and prevent link failure from causing
multicast service failure.
IGMP ring network forwarding can be applied to the RRPS ring, STP/RSTP/MSTP ring, and
G.8032 ring.
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