Raisecom ISCOM2600G-HI (A) Series User Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
8 Multicast
Raisecom Proprietary and Confidential
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
Source IP address of Query packets sent by IGMP Querier
IGMP querier sends the source IP address of Query packets. By default, the IP address of IP
interface 0 is used. If the IP address is not configured, 0.0.0.0 is used. When receiving Query
packets with IP address of 0.0.0.0, some hosts take it illegal and do not respond. Thus,
specifying the IP address for the Query packet is recommended.

Query interval
It is the query interval for common groups. The query message of common group is
periodically sent by the switch in multicast mode to all hosts in the shared network segment,
to query which multicast groups have members.

Maximum response time for Query packets
The maximum response time for Query packets is used to control the deadline for reporting
member relations by a host. When the host receives Query packets, it starts a timer for each
added multicast group. The value of the timer is between 0 and maximum response time.
When the timer expires, the host sends the Report packet to the multicast group.

Interval for the last member to send Query packets
It is also called the specified group query interval. It is the interval for the switch continues to
send Query packets for the specified group when receiving IGMP Leave packet for a specified
group by a host.
The Query packet for the specified multicast group is sent to query whether the group has
members on the interface. If yes, the members must send Report packets within the maximum
response time; after the switch receives Report packets in a specie period, it continues to
maintain multicast forwarding entries of the group; If the members fail to send Report packets
within the maximum response time, the switch judges that the last member of the multicast
group has left and thus deletes multicast forwarding entries.
8.4.2 Preparing for configurations
Scenario
On a network with multicast routing protocol widely applied, multiple hosts and client
subnets receive multicast information. Enable IGMP Querier on the switch connecting the
multicast router and hosts to block IGMP packets between hosts and the multicast router and
relieve the network load.
Configure IGMP Querier to relieve configuration and management of client subnet for the
multicast router and to implement multicast connection with the client subnet.
IGMP Querier is used in cooperation with IGMP Snooping/MVR.
Prerequisite

Create VLANs.

Add related interfaces to VLANs.
8.4.3 Default configurations of IGMP Querier
Default configurations of IGMP Querier area as below.

Raisecom ISCOM2600G-HI (A) Series Specifications

General

Brand	Raisecom
Model	ISCOM2600G-HI (A) Series
Category	Switch
Language	English