Igmp/Vlan Configuration Screen - Cabletron Systems SmartSwitch 6E122 Supplement Manual

The 802.1Q VLAN Configuration Menu screen displays 6 menu items,
including the following new menu item:
IGMP/VLAN CONFIGURATION
Used to enable or disable IGMP (Internet Group Management Protocol)
on selected VLANs. For details, refer to
1.23

IGMP/VLAN CONFIGURATION SCREEN

The IGMP/VLAN Configuration screen,
enable or disable IGMP (Internet Group Management Protocol,
RFC 2236) on selected VLANs.
IGMP provides a solution for handling multicast streams in layer 2
switching devices. IGMP is for hosts on multi-access networks to inform
locally attached switches of their Multicast group membership
information. This is performed by hosts multicasting IGMP Host
Membership Reports. Multicast switches listen for these messages and
then pass them to routers. This allows distribution trees to be formed to
deliver multicast datagrams.
Information from the IGMP packets is used to send the multicast stream
only to the end stations that request it. IGMP is enabled or disabled by
VLAN, not port-by-port.
Certain versions of firmware will not allow the switch to be a
NOTE
querier. Please check your release notes for further
information. Refer to RFC 2236, Section 8, for more
information on IGMP, and also
The following multicast routing protocols are transparently supported and
are used only to detect the location of routers (see the Release Notes for
any changes or additions to this list):
• DVMRP (Distance Vector Multicast Routing Protocol, RFC 1075)
• PIM (Protocol Independent Multicast) version 1 and 2
• CBT (Core Based Trees)
• MOSPF (Multicast OSPF, RFC 1583)
Local Management Supplement
IGMP/VLAN Configuration Screen
Section 1.23.
Figure 1-22, allows the user to
Appendix A.
1-57