Compex Systems SGX3226 - Manual (Page 56)

Chapter 7 Advanced Configuration for Compex SGX3226
46
1. Select IGMP Config from the Command window.
2. Choose enabled in the IGMP state field.
3. Click on the radio button to select the version for IGMP. Refer to the
next section for the explanation on IGMP v1.0 and v2.0
4. Hit on the Apply button and save your setting.
7.2.1 Definition on IGMP v1.0 and v2.0
For IGMP v1.0,
The Internet Group Management Protocol (IGMP v1.0) is used by IP hosts
to report their host group memberships to any immediately neighboring
multicast routers. IGMP is an asymmetric protocol and is specified here
from the point of view of a host, rather than a multicast router.
NOTE
NOTE: IGMPv1 has no leave mechanism. If a host no longer wants to receive
the traffic, it simply quits. If it is the last, the router will not have any answers to
its query and will delete the GDA for that subnet.
For IGMP v2.0,
IGMP v2.0 allows group membership termination to be quickly reported to
the routing protocol, which is important for high-bandwidth multicast
groups and/or subnets with highly volatile group membership.
Multicast routers use IGMP v2.0 to learn which groups have members on
each of their attached physical networks. A multicast router keeps a list of
multicast group memberships for each attached network, and a timer for
each membership. "Multicast group memberships" means the presence of at
least one member of a multicast group on a given attached network, not a
list of all of the members.
When a host receives a General Query, it sets delay timers for each group
(excluding the all-systems group) of which it is a member on the interface
from which it received the query.