ZT8101 Intel (CPU), ZT8101 Datasheet - Page 37

• Manufacturer Part Number: ZT8101
• Manufacturer: Intel (CPU)

Specifications of ZT8101

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.5
7.6
7.7
Intel
®
NetStructure
IGMP Group Settings
An IP host uses IGMP to register its IP multicast group membership with the switch. Periodically,
the switch queries the multicast group to see if the group is still in use:
DVMRP
DVMRP is a distance-vector routing protocol designed to support the forwarding of multicast
datagrams through an inter-network. DVMRP constructs source-rooted multicast delivery trees
using the Reverse Path Multicasting (RPM) algorithm. Unlike RIP, DVMRP is concerned with
computing the previous hops back to a source. The ZT 8101 switch supports DVMRP v3.
PIM Dense Mode (PIM-DM)
PIM Dense Mode (PIM-DM) is similar to DVMRP in that it employs the Reverse Path
Multicasting (RPM) algorithm. However, there are several important differences between PIM-DM
and DVMRP:
The ZT 8101 switch supports PIM-DM v2.
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If the group is still active, a single IP host responds to the query, and the group registration is
maintained.
If the group is inactive and a report is not received within the time limit for a response, the
group registration is removed.
PIM-DM relies on the presence of an existing unicast routing protocol to adapt to topology
changes, but it is independent of the mechanisms of the specific unicast routing protocol. In
contrast, DVMRP contains an integrated routing protocol that makes use of its own RIP-like
exchanges to compute the required unicast routing information.
Unlike DVMRP, which calculates a set of child interfaces for each (source and group) pair,
PIM-DM simply forwards multicast traffic on all downstream interfaces until explicit prune
messages are received. PIM-DM is willing to accept packet duplication to eliminate routing
protocol dependencies and to avoid the overhead involved in building the parent/child
database.
ZT 8101 10/100 Ethernet Switch Technical Product Specification
Layer 3 Multicast Routing Protocols
37