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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
6.21
Multicast Routing
This router can route multicast traffic to different subnetworks using either
Distance Vector Multicast Routing Protocol (DVMRP) or Protocol-Independent
Multicasting - Dense Mode or Sparse Mode (PIM-DM or PIM-SM). These
protocols all rely on messages sent from IGMP-enabled Layer 2 switches and
hosts to determine when hosts want to join or leave multicast groups.
DVMRP and PIM-DM flood multicast traffic downstream, and calculate the
shortest-path, source-rooted delivery tree between each source and destination
host group. DVMRP builds a source-rooted multicast delivery tree that allows it
to prevent looping and determine the shortest path to the source of the multicast
traffic. PIM-DM also builds a source-rooted multicast delivery tree for each
multicast source, but uses information from the router’s unicast routing table
instead of maintaining its own multicast routing table, making it routing protocol
independent.
PIM-SM uses the router’s local unicast routing table, but does not flood multicast
traffic. It only forwards multicast traffic when requested by a local or downstream
host. When service is requested by a host, it can use a Reverse Path Tree (RPT)
that channels the multicast traffic from each source through a single
Rendezvous Point (RP) within the local PIM-SM domain, and then forwards this
traffic to the Designated Router (DR) in the local network segment to which the
hosts is attached. However, when the multicast load from a particular source is
heavy enough to justify it, PIM-SM can be configured to construct a Shortest
Path Tree (SPT) directly from the DR up to the source, bypassing the RP and
thereby reducing service delays for active hosts and setup time for new hosts.
Also, note that if DVMRP and PIM are not enabled on this router or another
multicast routing protocol is used on the network, the ECN330-switch ports
attached to a multicast router can be manually configured to forward multicast
traffic (page 358).
6.21.1
Configuring Global Settings for Multicast Routing
To use multicast routing on this router, first globally enable multicast routing as
described in this section, then globally enable DVMRP (page 474) or PIM-DM
(page 484) or PIM-SM (page 493), and specify the interfaces that will participate
(page 479, page 485 or page 497, respectively). Note that only one multicast
routing protocol can be enabled on any given interface.
Summary of Contents for ECN330
Page 6: ...1553 KDU 137 365 Uen D 2006 06 16 Contents List of Abbreviations 1183 Glossary 1191 Index 1201...
Page 22: ...Introduction to the ECN330 switch 16 1553 KDU 137 365 Uen D 2006 06 16...
Page 26: ...Maintenance 20 1553 KDU 137 365 Uen D 2006 06 16...
Page 56: ...Initial Configuration 50 1553 KDU 137 365 Uen D 2006 06 16...
Page 520: ...Configuring the ECN330 switch 514 1553 KDU 137 365 Uen D 2006 06 16...
Page 1188: ...Specifications 1182 1553 KDU 137 365 Uen D 2006 06 16...
Page 1196: ...List of Abbreviations 1190 1553 KDU 137 365 Uen D 2006 06 16...
Page 1224: ...Index 1218 1553 KDU 137 365 Uen D 2006 06 16...
Page 1225: ......