ZT8101 Intel (CPU), ZT8101 Datasheet - Page 35

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

Specifications of ZT8101

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.3
Intel
®
Table 18. Forwarding Rules for Multicast Data to Another IP Interface
NetStructure
IGMP Queries
An IGMP querier sends IGMP Query packets periodically to help to maintain the multicast group
information for a VLAN. When IGMP Snooping is enabled for a VLAN, the switch uses the
following states to determine whether the VLAN becomes a querier:
The outgoing ports for the IGMPv1 Query or IGMPv2 Query packets are defined in Multicast
Forwarding within a VLAN section.
If the IGMP interface is designated as the IGMP querier, the switch uses the following intervals for
sending query packets:
The following table gives the sequence of these packets.
Unknown multicast data
Known group member multicast data
Forwarding Multicast Data Packets
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Non-Querier: Prevents the VLAN from becoming a querier.
V1 Querier: Enables the sending of IGMPv1 query packets. If no querier is present in the
VLAN or the VLAN’s IP address is smaller than current V1 querier, the switch becomes the
querier for the VLAN. IGMPv2 group specific query and leave packets are not handled.
V2 Querier: If a V1 querier is present in the VLAN, the switch remains silent. If no querier is
present in the VLAN or the VLAN’s IP address is smaller than current V2 querier, the switch
becomes the querier for the VLAN. IGMPv2 group specific query and leave packets are
handled.
When receiving an IGMPv2 leave packet, the IGMP interface issues an IGMPv2 group
specific query packet immediately and waits one second to check if any IGMP reports are
received on the ports. If not, the port is removed from the IGMP group member list, and the
group's multicast data is not forwarded to this port until an IGMP report is received again.
When you enable IGMP snooping or boot the switch with the querier option enabled, the first
query packet will not be sent for 255 seconds. This time delay is non-standard.
The second query packet will be sent after the “Startup Querier Interval” which is 1/4 *
“Query Interval.” By default, this is 31 seconds.
The next query packets will be sent periodically according to the “Query Interval.” The default
“Query Interval” is 125 seconds.
ZT 8101 10/100 Ethernet Switch Technical Product Specification
to another IP interface
Forwards to router ports.
Forwards to group member ports
and router ports.
Behavior
Layer 3 Multicast Routing Protocols
DVMRP or PIM-DM is enabled.
DVMRP or PIM-DM is enabled.
Remarks
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