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Based on the group membership information learned from IGMP, a
router/switch can determine which (if any) multicast traffic needs
to be forwarded to each of its ports. At Layer-3, multicast routers
use this information, along with a multicast routing protocol, to
support IP multicasting across the Internet.
IGMP provides the final step in an IP multicast packet delivery
service since it is only concerned with forwarding multicast traffic
from the local router/switch to group members on directly
attached subnetwork or LAN segment.
This switch supports IP Multicast Filtering by:
◆
Passively snooping on the IGMP Query and IGMP Report
packets transferred between IP Multicast Routers and IP
Multicast host groups to learn IP Multicast group members, and
◆
Actively sending IGMP Query messages to solicit IP Multicast
group members.
The purpose of IP multicast filtering is to optimize a switched
networkís performance, so multicast packets will only be
forwarded to those ports containing multicast group hosts or
multicast routers/switches instead of flooding to all ports in the
subnet (VLAN).
The TigerSwitch 1000, with IP multicast filtering capability, not
only passively monitors IGMP Query and Report messages; it can
also actively send IGMP Query messages to learn locations of
multicast routers/switches and member hosts in multicast groups
within each VLAN.
However, note that IGMP neither alters nor routes any IP multicast
packets. Since IGMP is not concerned with the delivery of IP
multicast packets across subnetworks, an external IP multicast
router is needed if IP multicast packets have to be routed across
different subnetworks.
Summary of Contents for 8606SX - annexe 1
Page 2: ......
Page 124: ...WEB BASED MANAGEMENT 3 50 ...
Page 134: ...ADVANCED TOPICS 4 10 ...
Page 138: ...TROUBLESHOOTING A 4 ...
Page 142: ...PIN ASSIGNMENTS B 4 ...
Page 150: ...INDEX Index 4 ...
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